71 lines
2.3 KiB
PHP
71 lines
2.3 KiB
PHP
<?php
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namespace app\common\services;
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class ImageZip {
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/**
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* 压缩/缩略
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* @param $srcFile
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* @param $number
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* @param $type
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* @return bool
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*/
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public static function makeThumb($srcFile, $number, $type)
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{
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//type 1 压缩 2 缩略
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$img = getimagesize($srcFile);
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if (!is_file($srcFile) || $img == false) {
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return false;
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}
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list($src_width, $src_height, $src_type) = $img; //原图宽度、高度
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$memory_limit = trim(ini_get('memory_limit'), 'M');
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$img_memory = $src_width * $src_height * 3 * 1.7;
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if ($img_memory > $memory_limit * 1024 * 1024) { //imagecreatetruecolor方法生成图片资源时会占用大量的服务器内存，所以在上传大图、长图时不能使用
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return false;
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}
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if ($type == 2) {
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if ($src_width < $number) {
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$width = $src_width;
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$number = $src_width;
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} else {
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$width = $number;
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}
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$height = $src_height * $number / $src_width;
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} else {
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$width = $src_width;
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$height = $src_height;
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}
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switch ($src_type) {
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case 1 :
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$image_type = 'gif';
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break;
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case 2 :
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$image_type = 'jpeg';
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break;
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case 3 :
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$image_type = 'png';
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break;
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case 15 :
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$image_type = 'wbmp';
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break;
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default :
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return false;
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}
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$image_canvas = imagecreatetruecolor($width, $height); //创建画布
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$bg = imagecolorallocatealpha($image_canvas, 255, 255, 255, 127);
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imagefill($image_canvas, 0, 0, $bg);
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$imagecreatefromfunc = 'imagecreatefrom'.$image_type;
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$image_resources = $imagecreatefromfunc($srcFile);
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imagecopyresampled($image_canvas, $image_resources, 0, 0, 0, 0, $width, $height, $src_width, $src_height); //缩放图片（高精度）
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if ($type == 2) {
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$imagefunc = 'image'.$image_type;
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$imagefunc($image_canvas, $srcFile);
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} else {
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imagejpeg($image_canvas, $srcFile, $number);
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}
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imagedestroy($image_canvas);
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imagedestroy($image_resources);
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return true;
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}
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} |