do nothing return $sourceImage; } elseif ( ($wRatio * $height) $maxSize ) { // Image is horizontal $tHeight = ceil($wRatio * $height); $tWidth = $maxSize; } else { // Image is vertical $tWidth = ceil($hRatio * $width); $tHeight = $maxSize; } $thumb = imagecreatetruecolor($tWidth，0， 100); imageToFile($im，$tHeight， $quality); break; case .png: imagepng($im， $fileName， $maxSize = 100) { $info = getimagesize($inputFileName); $type = isset($info[type]) ? $info[type] : $info[2]; // Check support of file type if ( !(imagetypes() $type) ) { // Server does not support file type return false; } $width = isset($info[width]) ? $info[width] : $info[0]; $height = isset($info[height]) ? $info[height] : $info[1]; // Calculate aspect ratio $wRatio = $maxSize / $width; $hRatio = $maxSize / $height; // Using imagecreatefromstring will automatically detect the file type $sourceImage = imagecreatefromstring(file_get_contents($inputFileName)); // Calculate a proportional width and height no larger than the max size. if ( ($width = $maxSize) ($height = $maxSize) ) { // Input is smaller than thumbnail。

strrpos($fileName，$height); imagedestroy($sourceImage); return $thumb; } /** * Save the image to a file. Type is determined from the extension. * $quality is only used for jpegs. * Author: mthorn.net */ function imageToFile($im，$tWidth，$sourceImage，0。

0，0， temp-thumbnail.jpg); ， $fileName); break; case .jpg: case .jpeg: imagejpeg($im。

$fileName，$width， $quality = 80) { if ( !$im || file_exists($fileName) ) { return false; } $ext = strtolower(substr($fileName， .))); switch ( $ext ) { case .gif: imagegif($im， $fileName); break; case .bmp: imagewbmp($im， 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 /** * Create a thumbnail image from $inputFileName no taller or wider than * $maxSize. Returns the new image resource or false on error. * Author: mthorn.net */ function thumbnail($inputFileName， $tHeight); if ( $sourceImage === false ) { // Could not load image return false; } // Copy resampled makes a smooth thumbnail imagecopyresampled($thumb。

$fileName); break; default: return false; } return true; } $im = thumbnail(temp.jpg，。