php等比例压缩图片

 1     /**
 2      * desription 压缩图片
 3      * @param sting $imgsrc 图片路径
 4      * @param string $imgdst 压缩后保存路径
 5      */
 6     public function compressedImage($imgsrc, $imgdst) {
 7         list($width, $height, $type) = getimagesize($imgsrc);
 8         
 9         $new_width = $width;//压缩后的图片宽
10         $new_height = $height;//压缩后的图片高
11                 
12         if($width >= 600){
13             $per = 600 / $width;//计算比例
14             $new_width = $width * $per;
15             $new_height = $height * $per;
16         }
17         
18         switch ($type) {
19             case 1:
20                 $giftype = check_gifcartoon($imgsrc);
21                 if ($giftype) {
22                     header('Content-Type:image/gif');
23                     $image_wp = imagecreatetruecolor($new_width, $new_height);
24                     $image = imagecreatefromgif($imgsrc);
25                     imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
26                     //90代表的是质量、压缩图片容量大小
27                     imagejpeg($image_wp, $imgdst, 90);
28                     imagedestroy($image_wp);
29                     imagedestroy($image);
30                 }
31                 break;
32             case 2:
33                 header('Content-Type:image/jpeg');
34                 $image_wp = imagecreatetruecolor($new_width, $new_height);
35                 $image = imagecreatefromjpeg($imgsrc);
36                 imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
37                 //90代表的是质量、压缩图片容量大小
38                 imagejpeg($image_wp, $imgdst, 90);
39                 imagedestroy($image_wp);
40                 imagedestroy($image);
41                 break;
42             case 3:
43                 header('Content-Type:image/png');
44                 $image_wp = imagecreatetruecolor($new_width, $new_height);
45                 $image = imagecreatefrompng($imgsrc);
46                 imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
47                 //90代表的是质量、压缩图片容量大小
48                 imagejpeg($image_wp, $imgdst, 90);
49                 imagedestroy($image_wp);
50                 imagedestroy($image);
51                 break;
52         }
53     }