<?php
function resizeThumbnailImage($thumb_image_name, $image, $width, $height, $start_width, $start_height, $scale) {
    list($imagewidth, $imageheight, $imageType) = getimagesize($image);
    $imageType = image_type_to_mime_type($imageType);
    $newImageWidth = ceil($width * $scale);
    $newImageHeight = ceil($height * $scale);
    $newImage = imagecreatetruecolor($newImageWidth, $newImageHeight);
    switch ($imageType) {
        case "image/gif":
            $source = imagecreatefromgif($image);
            break;
        case "image/pjpeg":
        case "image/jpeg":
        case "image/jpg":
            $source = imagecreatefromjpeg($image);
            break;
        case "image/png":
        case "image/x-png":
            $source = imagecreatefrompng($image);
            break;
    }
    imagecopyresampled($newImage, $source, 0, 0, $start_width, $start_height, $newImageWidth, $newImageHeight, $width, $height);
    switch ($imageType) {
        case "image/gif":
            imagegif($newImage, $thumb_image_name);
            break;
        case "image/pjpeg":
        case "image/jpeg":
        case "image/jpg":
            imagejpeg($newImage, $thumb_image_name, 90);
            break;
        case "image/png":
        case "image/x-png":
            imagepng($newImage, $thumb_image_name);
            break;
    }
    chmod($thumb_image_name, 0777);
    return $thumb_image_name;
}

教程网址:http://www.phprm.com/code/18750d1321b51f5a9ec696aa47ba264d.html

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