<?php
//////////////////////////////////////////////////////////////
//   phpThumb() by James Heinrich <info@silisoftware.com>   //
//   available at http://phpthumb.sourceforge.net           //
//   and/or https://github.com/JamesHeinrich/phpThumb       //
//                                                          //
//////////////////////////////////////////////////////////////
//                                                          //
// phpthumb.functions.php - general support functions       //
//                                                          //
//////////////////////////////////////////////////////////////
//                                                          //
//   edits                                                  //
//   2023-02-09 PHP 8 Support @fjf__@web.de                 //
//                                                          //
//////////////////////////////////////////////////////////////

if (!class_exists('phpthumb_functions')) {
	class phpthumb_functions {
	
		public static function user_function_exists($functionname) {
			if (function_exists('get_defined_functions')) {
				static $get_defined_functions = array();
				if (empty($get_defined_functions)) {
					$get_defined_functions = get_defined_functions();
				}
				return in_array(strtolower($functionname), $get_defined_functions['user']);
			}
			return function_exists($functionname);
		}
	
	
		public static function builtin_function_exists($functionname) {
			if (function_exists('get_defined_functions')) {
				static $get_defined_functions = array();
				if (empty($get_defined_functions)) {
					$get_defined_functions = get_defined_functions();
				}
				return in_array(strtolower($functionname), $get_defined_functions['internal']);
			}
			return function_exists($functionname);
		}
	
	
		public static function version_compare_replacement_sub($version1, $version2, $operator='') {
			// If you specify the third optional operator argument, you can test for a particular relationship.
			// The possible operators are: <, lt, <=, le, >, gt, >=, ge, ==, =, eq, !=, <>, ne respectively.
			// Using this argument, the function will return 1 if the relationship is the one specified by the operator, 0 otherwise.
	
			// If a part contains special version strings these are handled in the following order:
			// (any string not found in this list) < (dev) < (alpha = a) < (beta = b) < (RC = rc) < (#) < (pl = p)
			static $versiontype_lookup = array();
			if (empty($versiontype_lookup)) {
				$versiontype_lookup['dev']   = 10001;
				$versiontype_lookup['a']     = 10002;
				$versiontype_lookup['alpha'] = 10002;
				$versiontype_lookup['b']     = 10003;
				$versiontype_lookup['beta']  = 10003;
				$versiontype_lookup['RC']    = 10004;
				$versiontype_lookup['rc']    = 10004;
				$versiontype_lookup['#']     = 10005;
				$versiontype_lookup['pl']    = 10006;
				$versiontype_lookup['p']     = 10006;
			}
			$version1 = (isset($versiontype_lookup[$version1]) ? $versiontype_lookup[$version1] : $version1);
			$version2 = (isset($versiontype_lookup[$version2]) ? $versiontype_lookup[$version2] : $version2);
	
			switch ($operator) {
				case '<':
				case 'lt':
					return (int) ($version1 < $version2);
					break;
				case '<=':
				case 'le':
					return (int) ($version1 <= $version2);
					break;
				case '>':
				case 'gt':
					return (int) ($version1 > $version2);
					break;
				case '>=':
				case 'ge':
					return (int) ($version1 >= $version2);
					break;
				case '==':
				case '=':
				case 'eq':
					return (int) ($version1 == $version2);
					break;
				case '!=':
				case '<>':
				case 'ne':
					return (int) ($version1 != $version2);
					break;
			}
			if ($version1 == $version2) {
				return 0;
			} elseif ($version1 < $version2) {
				return -1;
			}
			return 1;
		}
	
	
		public static function version_compare_replacement($version1, $version2, $operator='') {
			if (function_exists('version_compare')) {
				// built into PHP v4.1.0+
				return version_compare($version1, $version2, $operator);
			}
	
			// The function first replaces _, - and + with a dot . in the version strings
			$version1 = strtr($version1, '_-+', '...');
			$version2 = strtr($version2, '_-+', '...');
	
			// and also inserts dots . before and after any non number so that for example '4.3.2RC1' becomes '4.3.2.RC.1'.
			// Then it splits the results like if you were using explode('.',$ver). Then it compares the parts starting from left to right.
			$version1 = preg_replace('#([\d]+)([A-Z]+)([\d]+)#i', '$1.$2.$3', $version1);
			$version2 = preg_replace('#([\d]+)([A-Z]+)([\d]+)#i', '$1.$2.$3', $version2);
	
			$parts1 = explode('.', $version1);
			$parts2 = explode('.', $version1);
			$parts_count = max(count($parts1), count($parts2));
			for ($i = 0; $i < $parts_count; $i++) {
				$comparison = self::version_compare_replacement_sub($version1, $version2, $operator);
				if ($comparison != 0) {
					return $comparison;
				}
			}
			return 0;
		}
	
		public static function escapeshellarg_replacement($arg) {
			if (function_exists('escapeshellarg') && !self::FunctionIsDisabled('escapeshellarg')) {
				return escapeshellarg($arg);
			}
			return '\''.str_replace('\'', '\\\'', $arg).'\'';
		}
	
		public static function phpinfo_array() {
			static $phpinfo_array = array();
			if (empty($phpinfo_array)) {
				ob_start();
				phpinfo();
				$phpinfo = ob_get_contents();
				ob_end_clean();
				$phpinfo_array = explode("\n", $phpinfo);
			}
			return $phpinfo_array;
		}
	
	
		public static function exif_info() {
			static $exif_info = array();
			if (empty($exif_info)) {
				// based on code by johnschaefer at gmx dot de
				// from PHP help on gd_info()
				$exif_info = array(
					'EXIF Support'           => '',
					'EXIF Version'           => '',
					'Supported EXIF Version' => '',
					'Supported filetypes'    => ''
				);
				$phpinfo_array = self::phpinfo_array();
				foreach ($phpinfo_array as $line) {
					$line = trim(strip_tags($line));
					foreach ($exif_info as $key => $value) {
						if (strpos($line, $key) === 0) {
							$newvalue = trim(str_replace($key, '', $line));
							$exif_info[$key] = $newvalue;
						}
					}
				}
			}
			return $exif_info;
		}
	
	
		public static function ImageTypeToMIMEtype($imagetype) {
			if (function_exists('image_type_to_mime_type') && ($imagetype >= 1) && ($imagetype <= 16)) {
				// PHP v4.3.0+
				return image_type_to_mime_type($imagetype);
			}
			static $image_type_to_mime_type = array(
				1  => 'image/gif',                     // IMAGETYPE_GIF
				2  => 'image/jpeg',                    // IMAGETYPE_JPEG
				3  => 'image/png',                     // IMAGETYPE_PNG
				4  => 'application/x-shockwave-flash', // IMAGETYPE_SWF
				5  => 'image/psd',                     // IMAGETYPE_PSD
				6  => 'image/bmp',                     // IMAGETYPE_BMP
				7  => 'image/tiff',                    // IMAGETYPE_TIFF_II (intel byte order)
				8  => 'image/tiff',                    // IMAGETYPE_TIFF_MM (motorola byte order)
				9  => 'application/octet-stream',      // IMAGETYPE_JPC
				10 => 'image/jp2',                     // IMAGETYPE_JP2
				11 => 'application/octet-stream',      // IMAGETYPE_JPX
				12 => 'application/octet-stream',      // IMAGETYPE_JB2
				13 => 'application/x-shockwave-flash', // IMAGETYPE_SWC
				14 => 'image/iff',                     // IMAGETYPE_IFF
				15 => 'image/vnd.wap.wbmp',            // IMAGETYPE_WBMP
				16 => 'image/xbm',                     // IMAGETYPE_XBM
	
				'gif'  => 'image/gif',                 // IMAGETYPE_GIF
				'jpg'  => 'image/jpeg',                // IMAGETYPE_JPEG
				'jpeg' => 'image/jpeg',                // IMAGETYPE_JPEG
				'png'  => 'image/png',                 // IMAGETYPE_PNG
				'bmp'  => 'image/bmp',                 // IMAGETYPE_BMP
				'ico'  => 'image/x-icon',
			);
	
			return (isset($image_type_to_mime_type[$imagetype]) ? $image_type_to_mime_type[$imagetype] : false);
		}
	
	
		public static function TranslateWHbyAngle($width, $height, $angle) {
			if (($angle % 180) == 0) {
				return array($width, $height);
			}
			$newwidth  = (abs(sin(deg2rad($angle))) * $height) + (abs(cos(deg2rad($angle))) * $width);
			$newheight = (abs(sin(deg2rad($angle))) * $width)  + (abs(cos(deg2rad($angle))) * $height);
			return array($newwidth, $newheight);
		}
	
		public static function HexCharDisplay($string) {
			$len = strlen($string);
			$output = '';
			for ($i = 0; $i < $len; $i++) {
				$output .= ' 0x'.str_pad(dechex(ord($string[$i])), 2, '0', STR_PAD_LEFT);
			}
			return $output;
		}
	
	
		public static function IsHexColor($HexColorString) {
			return preg_match('#^[0-9A-F]{6}$#i', $HexColorString);
		}
	
	
		public static function ImageColorAllocateAlphaSafe(&$gdimg_hexcolorallocate, $R, $G, $B, $alpha=false) {
			if (self::version_compare_replacement(PHP_VERSION, '4.3.2', '>=') && ($alpha !== false)) {
				return imagecolorallocatealpha($gdimg_hexcolorallocate, $R, $G, $B, (int) $alpha);
			} else {
				return imagecolorallocate($gdimg_hexcolorallocate, $R, $G, $B);
			}
		}
	
		public static function ImageHexColorAllocate(&$gdimg_hexcolorallocate, $HexColorString, $dieOnInvalid=false, $alpha=false) {
			if (!is_resource($gdimg_hexcolorallocate)) {
				die('$gdimg_hexcolorallocate is not a GD resource in ImageHexColorAllocate()');
			}
			if (self::IsHexColor($HexColorString)) {
				$R = hexdec(substr($HexColorString, 0, 2));
				$G = hexdec(substr($HexColorString, 2, 2));
				$B = hexdec(substr($HexColorString, 4, 2));
				return self::ImageColorAllocateAlphaSafe($gdimg_hexcolorallocate, $R, $G, $B, $alpha);
			}
			if ($dieOnInvalid) {
				die('Invalid hex color string: "'.$HexColorString.'"');
			}
			return imagecolorallocate($gdimg_hexcolorallocate, 0x00, 0x00, 0x00);
		}
	
	
		public static function HexColorXOR($hexcolor) {
			return strtoupper(str_pad(dechex(~hexdec($hexcolor) & 0xFFFFFF), 6, '0', STR_PAD_LEFT));
		}
	
	
		public static function GetPixelColor(&$img, $x, $y) {
			if (!is_resource($img)) {
				return false;
			}
			return @imagecolorsforindex($img, @imagecolorat($img, $x, $y));
		}
	
	
		public static function PixelColorDifferencePercent($currentPixel, $targetPixel) {
			$diff = 0;
			foreach ($targetPixel as $channel => $currentvalue) {
				$diff = max($diff, (max($currentPixel[$channel], $targetPixel[$channel]) - min($currentPixel[$channel], $targetPixel[$channel])) / 255);
			}
			return $diff * 100;
		}
	
		public static function GrayscaleValue($r, $g, $b) {
			return round(($r * 0.30) + ($g * 0.59) + ($b * 0.11));
		}
	
	
		public static function GrayscalePixel($OriginalPixel) {
			$gray = self::GrayscaleValue($OriginalPixel[ 'red'], $OriginalPixel[ 'green'], $OriginalPixel[ 'blue']);
			return array('red'=>$gray, 'green'=>$gray, 'blue'=>$gray);
		}
	
	
		public static function GrayscalePixelRGB($rgb) {
			$r = ($rgb >> 16) & 0xFF;
			$g = ($rgb >>  8) & 0xFF;
			$b =  $rgb        & 0xFF;
			return ($r * 0.299) + ($g * 0.587) + ($b * 0.114);
		}
	
	
		public static function ScaleToFitInBox($width, $height, $maxwidth=null, $maxheight=null, $allow_enlarge=true, $allow_reduce=true) {
			$maxwidth  = (null === $maxwidth  ? $width  : $maxwidth);
			$maxheight = (null === $maxheight ? $height : $maxheight);
			$scale_x = 1;
			$scale_y = 1;
			if (($width > $maxwidth) || ($width < $maxwidth)) {
				$scale_x = ($maxwidth / $width);
			}
			if (($height > $maxheight) || ($height < $maxheight)) {
				$scale_y = ($maxheight / $height);
			}
			$scale = min($scale_x, $scale_y);
			if (!$allow_enlarge) {
				$scale = min($scale, 1);
			}
			if (!$allow_reduce) {
				$scale = max($scale, 1);
			}
			return $scale;
		}
	
		public static function ImageCopyResampleBicubic($dst_img, $src_img, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) {
			// ron at korving dot demon dot nl
			// http://www.php.net/imagecopyresampled
	
			$scaleX = ($src_w - 1) / $dst_w;
			$scaleY = ($src_h - 1) / $dst_h;
	
			$scaleX2 = $scaleX / 2.0;
			$scaleY2 = $scaleY / 2.0;
	
			$isTrueColor = imageistruecolor($src_img);
	
			for ($y = $src_y; $y < $src_y + $dst_h; $y++) {
				$sY   = $y * $scaleY;
				$siY  = (int) $sY;
				$siY2 = (int) $sY + $scaleY2;
	
				for ($x = $src_x; $x < $src_x + $dst_w; $x++) {
					$sX   = $x * $scaleX;
					$siX  = (int) $sX;
					$siX2 = (int) $sX + $scaleX2;
	
					if ($isTrueColor) {
	
						$c1 = imagecolorat($src_img, $siX, $siY2);
						$c2 = imagecolorat($src_img, $siX, $siY);
						$c3 = imagecolorat($src_img, $siX2, $siY2);
						$c4 = imagecolorat($src_img, $siX2, $siY);
	
						$r = (( $c1             +  $c2             +  $c3             +  $c4            ) >> 2) & 0xFF0000;
						$g = ((($c1 & 0x00FF00) + ($c2 & 0x00FF00) + ($c3 & 0x00FF00) + ($c4 & 0x00FF00)) >> 2) & 0x00FF00;
						$b = ((($c1 & 0x0000FF) + ($c2 & 0x0000FF) + ($c3 & 0x0000FF) + ($c4 & 0x0000FF)) >> 2);
	
					} else {
	
						$c1 = imagecolorsforindex($src_img, imagecolorat($src_img, $siX, $siY2));
						$c2 = imagecolorsforindex($src_img, imagecolorat($src_img, $siX, $siY));
						$c3 = imagecolorsforindex($src_img, imagecolorat($src_img, $siX2, $siY2));
						$c4 = imagecolorsforindex($src_img, imagecolorat($src_img, $siX2, $siY));
	
						$r = ($c1['red']   + $c2['red']   + $c3['red']   + $c4['red'] )  << 14;
						$g = ($c1['green'] + $c2['green'] + $c3['green'] + $c4['green']) <<  6;
						$b = ($c1['blue']  + $c2['blue']  + $c3['blue']  + $c4['blue'] ) >>  2;
	
					}
					imagesetpixel($dst_img, $dst_x + $x - $src_x, $dst_y + $y - $src_y, $r+$g+$b);
				}
			}
			return true;
		}
	
	
		public static function ImageCreateFunction($x_size, $y_size) {
			$ImageCreateFunction = 'imagecreate';
			if (self::gd_version() >= 2.0) {
				$ImageCreateFunction = 'imagecreatetruecolor';
			}
			if (!function_exists($ImageCreateFunction)) {
				return phpthumb::ErrorImage($ImageCreateFunction.'() does not exist - no GD support?');
			}
			if (($x_size <= 0) || ($y_size <= 0)) {
				return phpthumb::ErrorImage('Invalid image dimensions: '.$ImageCreateFunction.'('.$x_size.', '.$y_size.')');
			}
			return $ImageCreateFunction(round($x_size), round($y_size));
		}
	
	
		public static function ImageCopyRespectAlpha(&$dst_im, &$src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $opacity_pct=100) {
			$opacipct = $opacity_pct / 100;
			for ($x = $src_x; $x < $src_w; $x++) {
				for ($y = $src_y; $y < $src_h; $y++) {
					$RealPixel    = self::GetPixelColor($dst_im, $dst_x + $x, $dst_y + $y);
					$OverlayPixel = self::GetPixelColor($src_im, $x, $y);
					$alphapct = $OverlayPixel['alpha'] / 127;
					$overlaypct = (1 - $alphapct) * $opacipct;
	
					$newcolor = self::ImageColorAllocateAlphaSafe(
						$dst_im,
						$RealPixel['alpha'] == 127 ? $OverlayPixel['red'] : ($OverlayPixel['alpha'] == 127 ? $RealPixel['red'] : (round($RealPixel['red'] * (1 - $overlaypct)) + ($OverlayPixel['red'] * $overlaypct))),
						$RealPixel['alpha'] == 127 ? $OverlayPixel['green'] : ($OverlayPixel['alpha'] == 127 ? $RealPixel['green'] : (round($RealPixel['green'] * (1 - $overlaypct)) + ($OverlayPixel['green'] * $overlaypct))),
						$RealPixel['alpha'] == 127 ? $OverlayPixel['blue'] : ($OverlayPixel['alpha'] == 127 ? $RealPixel['blue'] : (round($RealPixel['blue'] * (1 - $overlaypct)) + ($OverlayPixel['blue'] * $overlaypct))),
	//					0);
						min([$RealPixel['alpha'], floor($OverlayPixel['alpha'] * $opacipct)])
					);
	
					imagesetpixel($dst_im, $dst_x + $x, $dst_y + $y, $newcolor);
				}
			}
			return true;
		}
	
	
		public static function ProportionalResize($old_width, $old_height, $new_width=false, $new_height=false) {
			$old_aspect_ratio = $old_width / $old_height;
			if (($new_width === false) && ($new_height === false)) {
				return false;
			} elseif ($new_width === false) {
				$new_width = $new_height * $old_aspect_ratio;
			} elseif ($new_height === false) {
				$new_height = $new_width / $old_aspect_ratio;
			}
			$new_aspect_ratio = $new_width / $new_height;
			if ($new_aspect_ratio == $old_aspect_ratio) {
				// great, done
			} elseif ($new_aspect_ratio < $old_aspect_ratio) {
				// limited by width
				$new_height = $new_width / $old_aspect_ratio;
			} elseif ($new_aspect_ratio > $old_aspect_ratio) {
				// limited by height
				$new_width = $new_height * $old_aspect_ratio;
			}
			return array(
				(int) round($new_width),
				(int) round($new_height)
			);
		}
	
	
		public static function FunctionIsDisabled($function) {
			static $DisabledFunctions = null;
			if (null === $DisabledFunctions) {
				$disable_functions_local  = explode(',',     strtolower(@ini_get('disable_functions')));
				$disable_functions_global = explode(',', strtolower(@get_cfg_var('disable_functions')));
				foreach ($disable_functions_local as $key => $value) {
					$DisabledFunctions[trim($value)] = 'local';
				}
				foreach ($disable_functions_global as $key => $value) {
					$DisabledFunctions[trim($value)] = 'global';
				}
				if (@ini_get('safe_mode')) {
					$DisabledFunctions['shell_exec']     = 'local';
					$DisabledFunctions['set_time_limit'] = 'local';
				}
			}
			return isset($DisabledFunctions[strtolower($function)]);
		}
	
	
		public static function SafeExec($command) {
			static $AllowedExecFunctions = array();
			if (empty($AllowedExecFunctions)) {
				$AllowedExecFunctions = array('shell_exec'=>true, 'passthru'=>true, 'system'=>true, 'exec'=>true);
				foreach ($AllowedExecFunctions as $key => $value) {
					$AllowedExecFunctions[$key] = !self::FunctionIsDisabled($key);
				}
			}
			$command .= ' 2>&1'; // force redirect stderr to stdout
			foreach ($AllowedExecFunctions as $execfunction => $is_allowed) {
				if (!$is_allowed) {
					continue;
				}
				$returnvalue = false;
				switch ($execfunction) {
					case 'passthru':
					case 'system':
						ob_start();
						$execfunction($command);
						$returnvalue = ob_get_contents();
						ob_end_clean();
						break;
	
					case 'exec':
						$output = array();
						$lastline = $execfunction($command, $output);
						$returnvalue = implode("\n", $output);
						break;
	
					case 'shell_exec':
						ob_start();
						$returnvalue = $execfunction($command);
						ob_end_clean();
						break;
				}
				return $returnvalue;
			}
			return false;
		}
	
	
		public static function ApacheLookupURIarray($filename) {
			// apache_lookup_uri() only works when PHP is installed as an Apache module.
			if (PHP_SAPI == 'apache') {
				//$property_exists_exists = function_exists('property_exists');
				$keys = array('status', 'the_request', 'status_line', 'method', 'content_type', 'handler', 'uri', 'filename', 'path_info', 'args', 'boundary', 'no_cache', 'no_local_copy', 'allowed', 'send_bodyct', 'bytes_sent', 'byterange', 'clength', 'unparsed_uri', 'mtime', 'request_time');
				if ($apacheLookupURIobject = @apache_lookup_uri($filename)) {
					$apacheLookupURIarray = array();
					foreach ($keys as $key) {
						$apacheLookupURIarray[$key] = @$apacheLookupURIobject->$key;
					}
					return $apacheLookupURIarray;
				}
			}
			return false;
		}
	
	
		public static function gd_is_bundled() {
			static $isbundled = null;
			if (null === $isbundled) {
				$gd_info = gd_info();
				$isbundled = (strpos($gd_info['GD Version'], 'bundled') !== false);
			}
			return $isbundled;
		}
	
	
		public static function gd_version($fullstring=false) {
			static $cache_gd_version = array();
			if (empty($cache_gd_version)) {
				$gd_info = gd_info();
				if (preg_match('#bundled \((.+)\)$#i', $gd_info['GD Version'], $matches)) {
					$cache_gd_version[1] = $gd_info['GD Version'];  // e.g. "bundled (2.0.15 compatible)"
					$cache_gd_version[0] = (float) $matches[1];     // e.g. "2.0" (not "bundled (2.0.15 compatible)")
				} else {
					$cache_gd_version[1] = $gd_info['GD Version'];                       // e.g. "1.6.2 or higher"
					$cache_gd_version[0] = (float) substr($gd_info['GD Version'], 0, 3); // e.g. "1.6" (not "1.6.2 or higher")
				}
			}
			return $cache_gd_version[ (int) $fullstring ];
		}
	
	
		public static function filesize_remote($remotefile, $timeout=10) {
			$size = false;
			$parsed_url = self::ParseURLbetter($remotefile);
			if ($fp = @fsockopen($parsed_url['host'], $parsed_url['port'], $errno, $errstr, $timeout)) {
				fwrite($fp, 'HEAD '.$parsed_url['path'].$parsed_url['query'].' HTTP/1.0'."\r\n".'Host: '.$parsed_url['host']."\r\n\r\n");
				if (self::version_compare_replacement(PHP_VERSION, '4.3.0', '>=')) {
					stream_set_timeout($fp, $timeout);
				}
				while (!feof($fp)) {
					$headerline = fgets($fp, 4096);
					if (preg_match('#^Content-Length: (.*)#i', $headerline, $matches)) {
						$size = (int) $matches[ 1];
						break;
					}
				}
				fclose ($fp);
			}
			return $size;
		}
	
	
		public static function filedate_remote($remotefile, $timeout=10) {
			$date = false;
			$parsed_url = self::ParseURLbetter($remotefile);
			if ($fp = @fsockopen($parsed_url['host'], $parsed_url['port'], $errno, $errstr, $timeout)) {
				fwrite($fp, 'HEAD '.$parsed_url['path'].$parsed_url['query'].' HTTP/1.0'."\r\n".'Host: '.$parsed_url['host']."\r\n\r\n");
				if (self::version_compare_replacement(PHP_VERSION, '4.3.0', '>=')) {
					stream_set_timeout($fp, $timeout);
				}
				while (!feof($fp)) {
					$headerline = fgets($fp, 4096);
					if (preg_match('#^Last-Modified: (.*)#i', $headerline, $matches)) {
						$date = strtotime($matches[1]) - date('Z');
						break;
					}
				}
				fclose ($fp);
			}
			return $date;
		}
	
	
		public static function md5_file_safe($filename) {
			// md5_file() doesn't exist in PHP < 4.2.0
			if (function_exists('md5_file')) {
				return md5_file($filename);
			}
			if ($fp = @fopen($filename, 'rb')) {
				$rawData = '';
				do {
					$buffer = fread($fp, 8192);
					$rawData .= $buffer;
				} while (strlen($buffer) > 0);
				fclose($fp);
				return md5($rawData);
			}
			return false;
		}
	
	
		public static function nonempty_min() {
			$arg_list = func_get_args();
			$acceptable = array();
			foreach ($arg_list as $arg) {
				if ($arg) {
					$acceptable[] = $arg;
				}
			}
			return min($acceptable);
		}
	
	
		public static function LittleEndian2String($number, $minbytes=1) {
			$intstring = '';
			while ($number > 0) {
				$intstring .= chr($number & 255);
				$number    >>= 8;
			}
			return str_pad($intstring, $minbytes, "\x00", STR_PAD_RIGHT);
		}
	
		public static function OneOfThese() {
			// return the first useful (non-empty/non-zero/non-false) value from those passed
			$arg_list = func_get_args();
			foreach ($arg_list as $key => $value) {
				if ($value) {
					return $value;
				}
			}
			return false;
		}
	
		public static function CaseInsensitiveInArray($needle, $haystack) {
			$needle = strtolower($needle);
			foreach ($haystack as $key => $value) {
				if (is_array($value)) {
					// skip?
				} elseif ($needle == strtolower($value)) {
					return true;
				}
			}
			return false;
		}
	
		public static function URLreadFsock($host, $file, &$errstr, $successonly=true, $port=-1, $timeout=10) {
			if (!function_exists('fsockopen') || self::FunctionIsDisabled('fsockopen')) {
				$errstr = 'URLreadFsock says: function fsockopen() unavailable';
				return false;
			}
			$port = (int) ($port ? $port : -1); // passing anything as the $port parameter (even empty values like null, false, 0, "") will override the default -1. fsockopen uses -1 as the default port value.
			//if ($fp = @fsockopen($host, $port, $errno, $errstr, $timeout)) {
			if ($fp = @fsockopen((($port == 443) ? 'ssl://' : '').$host, $port, $errno, $errstr, $timeout)) { // https://github.com/JamesHeinrich/phpThumb/issues/39
				$out  = 'GET '.$file.' HTTP/1.0'."\r\n";
				$out .= 'Host: '.$host."\r\n";
				$out .= 'Connection: Close'."\r\n\r\n";
				fwrite($fp, $out);
	
				$isHeader = true;
				$data_header = '';
				$data_body   = '';
				$header_newlocation = '';
				while (!feof($fp)) {
					$line = fgets($fp, 1024);
					if ($isHeader) {
						$data_header .= $line;
					} else {
						$data_body .= $line;
					}
					if (preg_match('#^HTTP/[\\.\d]+ ([\d]+) (.+)$#i', rtrim($line), $matches)) {
						list( , $errno, $errstr) = $matches;
						$errno = (int) $errno;
					} elseif (preg_match('#^Location: (.*)$#i', rtrim($line), $matches)) {
						$header_newlocation = $matches[1];
					}
					if ($isHeader && ($line == "\r\n")) {
						$isHeader = false;
						if ($successonly) {
							switch ($errno) {
								case 200:
									// great, continue
									break;
	
								default:
									$errstr = $errno.' '.$errstr.($header_newlocation ? '; Location: '.$header_newlocation : '');
									fclose($fp);
									return false;
									break;
							}
						}
					}
				}
				fclose($fp);
				return $data_body;
			}
			return null;
		}
	
		public static function CleanUpURLencoding($url, $queryseperator='&') {
			if (!0 === stripos($url, "http") ) {
				return $url;
			}
			$parsed_url = self::ParseURLbetter($url);
			$pathelements = explode('/', $parsed_url['path']);
			$CleanPathElements = array();
			$TranslationMatrix = array(' '=>'%20');
			foreach ($pathelements as $key => $pathelement) {
				$CleanPathElements[] = strtr($pathelement, $TranslationMatrix);
			}
			foreach ($CleanPathElements as $key => $value) {
				if ($value === '') {
					unset($CleanPathElements[$key]);
				}
			}
	
			$queries = explode($queryseperator, $parsed_url['query']);
			$CleanQueries = array();
			foreach ($queries as $key => $query) {
				@list($param, $value) = explode('=', $query);
				$CleanQueries[] = strtr($param, $TranslationMatrix).($value ? '='.strtr($value, $TranslationMatrix) : '');
			}
			foreach ($CleanQueries as $key => $value) {
				if ($value === '') {
					unset($CleanQueries[$key]);
				}
			}
	
			$cleaned_url  = $parsed_url['scheme'].'://';
			$cleaned_url .= ($parsed_url['username'] ? $parsed_url['username'].($parsed_url['password'] ? ':'.$parsed_url['password'] : '').'@' : '');
			$cleaned_url .= $parsed_url['host'];
			$cleaned_url .= (($parsed_url['port'] && ($parsed_url['port'] != self::URLschemeDefaultPort($parsed_url['scheme']))) ? ':'.$parsed_url['port'] : '');
			$cleaned_url .= '/'.implode('/', $CleanPathElements);
			$cleaned_url .= (!empty($CleanQueries) ? '?'.implode($queryseperator, $CleanQueries) : '');
			return $cleaned_url;
		}
	
		public static function URLschemeDefaultPort($scheme) {
			static $schemePort = array(
				'ftp'   => 21,
				'http'  => 80,
				'https' => 443,
			);
			return (isset($schemePort[strtolower($scheme)]) ? $schemePort[strtolower($scheme)] : null);
		}
	
		public static function ParseURLbetter($url) {
			$parsedURL = @parse_url($url);
			foreach (array('scheme', 'host', 'port', 'user', 'pass', 'path', 'query', 'fragment') as $key) { // ensure all possible array keys are always returned
				if (!array_key_exists($key, $parsedURL)) {
					$parsedURL[$key] = null;
				}
			}
			$parsedURL['port'] = ($parsedURL['port'] ? $parsedURL['port'] : self::URLschemeDefaultPort($parsedURL['scheme']));
			return $parsedURL;
		}
	
		public static function SafeURLread($url, &$error, $timeout=10, $followredirects=true) {
			$error   = '';
			$errstr  = '';
			$rawData = '';
	
			$parsed_url = self::ParseURLbetter($url);
			$alreadyLookedAtURLs[trim($url)] = true;
	
			while (true) {
				$tryagain = false;
				$rawData = self::URLreadFsock($parsed_url['host'], $parsed_url['path'].'?'.$parsed_url['query'], $errstr, true, $parsed_url['port'], $timeout);
				if ($followredirects && preg_match('#302 [a-z ]+; Location\\: (http.*)#i', $errstr, $matches)) {
					$matches[1] = trim(@$matches[1]);
					if (!@$alreadyLookedAtURLs[$matches[1]]) {
						// loop through and examine new URL
						$error .= 'URL "'.$url.'" redirected to "'.$matches[1].'"';
	
						$tryagain = true;
						$alreadyLookedAtURLs[$matches[1]] = true;
						$parsed_url = self::ParseURLbetter($matches[ 1]);
					}
				}
				if (!$tryagain) {
					break;
				}
			}
	
			if ($rawData === false) {
				$error .= 'Error opening "'.$url.'":'."\n\n".$errstr;
				return false;
			} elseif ($rawData === null) {
				// fall through
				$error .= 'Error opening "'.$url.'":'."\n\n".$errstr;
			} else {
				return $rawData;
			}
	
			if (function_exists('curl_version') && !self::FunctionIsDisabled('curl_exec')) {
				$ch = curl_init();
				curl_setopt($ch, CURLOPT_URL, $url);
				curl_setopt($ch, CURLOPT_HEADER, false);
				curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
				curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
				curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
				curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
				curl_setopt($ch, CURLOPT_FOLLOWLOCATION, (bool) $followredirects);
				curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
				$rawData = curl_exec($ch);
				curl_close($ch);
				if (strlen($rawData) > 0) {
					$error .= 'CURL succeeded ('.strlen($rawData).' bytes); ';
					return $rawData;
				}
				$error .= 'CURL available but returned no data; ';
			} else {
				$error .= 'CURL unavailable; ';
			}
	
			$BrokenURLfopenPHPversions = array('4.4.2');
			if (in_array(PHP_VERSION, $BrokenURLfopenPHPversions)) {
				$error .= 'fopen(URL) broken in PHP v'. PHP_VERSION .'; ';
			} elseif (@ini_get('allow_url_fopen')) {
				$rawData = '';
				$error_fopen = '';
				ob_start();
				if ($fp = fopen($url, 'rb')) {
					do {
						$buffer = fread($fp, 8192);
						$rawData .= $buffer;
					} while (strlen($buffer) > 0);
					fclose($fp);
				} else {
					$error_fopen .= trim(strip_tags(ob_get_contents()));
				}
				ob_end_clean();
				$error .= $error_fopen;
				if (!$error_fopen) {
					$error .= '; "allow_url_fopen" succeeded ('.strlen($rawData).' bytes); ';
					return $rawData;
				}
				$error .= '; "allow_url_fopen" enabled but returned no data ('.$error_fopen.'); ';
			} else {
				$error .= '"allow_url_fopen" disabled; ';
			}
	
			return false;
		}
	
		public static function EnsureDirectoryExists($dirname, $mask = 0755) {
			$directory_elements = explode(DIRECTORY_SEPARATOR, $dirname);
			$startoffset = (!$directory_elements[0] ? 2 : 1);  // unix with leading "/" then start with 2nd element; Windows with leading "c:\" then start with 1st element
			$open_basedirs = preg_split('#[;:]#', ini_get('open_basedir'));
			foreach ($open_basedirs as $key => $open_basedir) {
				if (preg_match('#^'.preg_quote($open_basedir).'#', $dirname) && (strlen($dirname) > strlen($open_basedir))) {
					$startoffset = substr_count($open_basedir, DIRECTORY_SEPARATOR) + 1;
					break;
				}
			}
			$i = $startoffset;
			$endoffset = count($directory_elements);
			for ($i = $startoffset; $i <= $endoffset; $i++) {
				$test_directory = implode(DIRECTORY_SEPARATOR, array_slice($directory_elements, 0, $i));
				if (!$test_directory) {
					continue;
				}
				if (!@is_dir($test_directory)) {
					if (@file_exists($test_directory)) {
						// directory name already exists as a file
						return false;
					}
					@mkdir($test_directory, $mask);
					@chmod($test_directory, $mask);
					if (!@is_dir($test_directory) || !@is_writable($test_directory)) {
						return false;
					}
				}
			}
			return true;
		}
	
	
		public static function GetAllFilesInSubfolders($dirname) {
			$AllFiles = array();
			$dirname = rtrim(realpath($dirname), '/\\');
			if ($dirhandle = @opendir($dirname)) {
				while (($file = readdir($dirhandle)) !== false) {
					$fullfilename = $dirname.DIRECTORY_SEPARATOR.$file;
					if (is_file($fullfilename)) {
						$AllFiles[] = $fullfilename;
					} elseif (is_dir($fullfilename)) {
						switch ($file) {
							case '.':
							case '..':
								break;
	
							default:
								$AllFiles[] = $fullfilename;
								$subfiles = self::GetAllFilesInSubfolders($fullfilename);
								foreach ($subfiles as $filename) {
									$AllFiles[] = $filename;
								}
								break;
						}
					} else {
						// ignore?
					}
				}
				closedir($dirhandle);
			}
			sort($AllFiles);
			return array_unique($AllFiles);
		}
	
	
		public static function SanitizeFilename($filename) {
			$filename = preg_replace('/[^'.preg_quote(' !#$%^()+,-.;<>=@[]_{}').'a-zA-Z0-9]/', '_', $filename);
			if (self::version_compare_replacement(PHP_VERSION, '4.1.0', '>=')) {
				$filename = trim($filename, '.');
			}
			return $filename;
		}
	
		public static function PasswordStrength($password) {
			$strength = 0;
			$strength += strlen(preg_replace('#[^a-z]#',       '', $password)) * 0.5; // lowercase characters are weak
			$strength += strlen(preg_replace('#[^A-Z]#',       '', $password)) * 0.8; // uppercase characters are somewhat better
			$strength += strlen(preg_replace('#[^0-9]#',       '', $password)) * 1.0; // numbers are somewhat better
			$strength += strlen(preg_replace('#[a-zA-Z0-9]#',  '', $password)) * 2.0; // other non-alphanumeric characters are best
			return $strength;
		}
	
	}
	
	
	////////////// END: class phpthumb_functions //////////////
	
	
	if (!function_exists('gd_info')) {
		// built into PHP v4.3.0+ (with bundled GD2 library)
		function gd_info() {
			static $gd_info = array();
			if (empty($gd_info)) {
				// based on code by johnschaefer at gmx dot de
				// from PHP help on gd_info()
				$gd_info = array(
					'GD Version'         => '',
					'FreeType Support'   => false,
					'FreeType Linkage'   => '',
					'T1Lib Support'      => false,
					'GIF Read Support'   => false,
					'GIF Create Support' => false,
					'JPG Support'        => false,
					'PNG Support'        => false,
					'WBMP Support'       => false,
					'XBM Support'        => false
				);
				$phpinfo_array = phpthumb_functions::phpinfo_array();
				foreach ($phpinfo_array as $line) {
					$line = trim(strip_tags($line));
					foreach ($gd_info as $key => $value) {
						//if (strpos($line, $key) !== false) {
						if (strpos($line, $key) === 0) {
							$newvalue = trim(str_replace($key, '', $line));
							$gd_info[$key] = $newvalue;
						}
					}
				}
				if (empty($gd_info['GD Version'])) {
					// probable cause: "phpinfo() disabled for security reasons"
					if (function_exists('imagetypes')) {
						$imagetypes = imagetypes();
						if ($imagetypes & IMG_PNG) {
							$gd_info['PNG Support'] = true;
						}
						if ($imagetypes & IMG_GIF) {
							$gd_info['GIF Create Support'] = true;
						}
						if ($imagetypes & IMG_JPG) {
							$gd_info['JPG Support'] = true;
						}
						if ($imagetypes & IMG_WBMP) {
							$gd_info['WBMP Support'] = true;
						}
					}
					// to determine capability of GIF creation, try to use imagecreatefromgif on a 1px GIF
					if (function_exists('imagecreatefromgif')) {
						if ($tempfilename = phpthumb::phpThumb_tempnam()) {
							if ($fp_tempfile = @fopen($tempfilename, 'wb')) {
								fwrite($fp_tempfile, base64_decode('R0lGODlhAQABAIAAAH//AP///ywAAAAAAQABAAACAUQAOw==')); // very simple 1px GIF file base64-encoded as string
								fclose($fp_tempfile);
								@chmod($tempfilename, $this->getParameter('config_file_create_mask'));
	
								// if we can convert the GIF file to a GD image then GIF create support must be enabled, otherwise it's not
								$gd_info['GIF Read Support'] = (bool) @imagecreatefromgif($tempfilename);
							}
							unlink($tempfilename);
						}
					}
					if (function_exists('imagecreatetruecolor') && @imagecreatetruecolor(1, 1)) {
						$gd_info['GD Version'] = '2.0.1 or higher (assumed)';
					} elseif (function_exists('imagecreate') && @imagecreate(1, 1)) {
						$gd_info['GD Version'] = '1.6.0 or higher (assumed)';
					}
				}
			}
			return $gd_info;
		}
	}
	
	
	if (!function_exists('is_executable')) {
		// in PHP v3+, but v5.0+ for Windows
		function is_executable($filename) {
			// poor substitute, but better than nothing
			return file_exists($filename);
		}
	}
	
	
	if (!function_exists('preg_quote')) {
		// included in PHP v3.0.9+, but may be unavailable if not compiled in
		function preg_quote($string, $delimiter='\\') {
			static $preg_quote_array = array();
			if (empty($preg_quote_array)) {
				$escapeables = '.\\+*?[^]$(){}=!<>|:';
				for ($i = 0, $iMax = strlen($escapeables); $i < $iMax; $i++) {
					$strtr_preg_quote[$escapeables[$i]] = $delimiter.$escapeables[$i];
				}
			}
			return strtr($string, $strtr_preg_quote);
		}
	}
	
	if (!function_exists('file_get_contents')) {
		// included in PHP v4.3.0+
		function file_get_contents($filename) {
			if (preg_match('#^(f|ht)tp\://#i', $filename)) {
				return SafeURLread($filename, $error);
			}
			if ($fp = @fopen($filename, 'rb')) {
				$rawData = '';
				do {
					$buffer = fread($fp, 8192);
					$rawData .= $buffer;
				} while (strlen($buffer) > 0);
				fclose($fp);
				return $rawData;
			}
			return false;
		}
	}
	
	
	if (!function_exists('file_put_contents')) {
		// included in PHP v5.0.0+
		function file_put_contents($filename, $filedata) {
			if ($fp = @fopen($filename, 'wb')) {
				fwrite($fp, $filedata);
				fclose($fp);
				return true;
			}
			return false;
		}
	}
	
	if (!function_exists('imagealphablending')) {
		// built-in function requires PHP v4.0.6+ *and* GD v2.0.1+
		function imagealphablending(&$img, $blendmode=true) {
			// do nothing, this function is declared here just to
			// prevent runtime errors if GD2 is not available
			return true;
		}
	}
	
	if (!function_exists('imagesavealpha')) {
		// built-in function requires PHP v4.3.2+ *and* GD v2.0.1+
		function imagesavealpha(&$img, $blendmode=true) {
			// do nothing, this function is declared here just to
			// prevent runtime errors if GD2 is not available
			return true;
		}
	}	
}