代码如下
1 <?php
2
3 namespace App\Contract;
4
5 use Carbon\Carbon;
6
7 /**
8 * 图片压缩封装类
9 * @author jackie <2019.11.20>
10 */
11 class CompressImageContract
12 {
13 /**
14 * desription 压缩图片
15 * @param sting $imgsrc 图片路径(服務器絕對路徑)
16 * @param string $imgdst 压缩后保存路径(服務器絕對路徑)
17 */
18 public function image_png_size_add($imgsrc, $imgdst)
19 {
20 $zip_width = config("config.zip_width");//讀取默認最小寬度
21 $zip_height = config("config.zip_height");//讀取默認最小高度
22 $zip_per = config("config.zip_per");//讀取默認壓縮比例
23
24 list($width, $height, $type) = getimagesize($imgsrc);
25 $new_width = ceil(($width > 600 ? 600 : $width) * $zip_per);
26 $new_height = ceil(($height > 600 ? 600 : $height) * $zip_per);
27 /*$width = 3000;
28 $height = 150;
29 $new_width = $width * $zip_per;
30 $new_height = $height * $zip_per;*/
31
32 //寬度、高度都小於最小值，取最大比例值
33 if ($new_width < $zip_width && $new_height < $zip_height) {
34 $formatWidth = sprintf("%.1f", $zip_width / $width);
35 $perWidth = $formatWidth + 0.1;
36
37 $formatHeight = sprintf("%.1f", $zip_height / $height);
38 $perHeight = $formatHeight + 0.1;
39
40 $per = $perWidth >= $perHeight ? $perWidth : $perHeight;
41 $per = $per < 1 ? $per : 1;//壓縮比例不能大於1
42 $new_width = ceil($width * $per);
43 $new_height = ceil($height * $per);
44 //return $new_width.'/'.$new_height.$per.'/**1';
45 }
46
47 //寬度小於最小值，高度正常，計算寬度最小比例
48 if ($new_width < $zip_width && $new_height > $zip_height) {
49 $formatWidth = sprintf("%.1f", $zip_width / $width);
50 $per = $formatWidth + 0.1;
51 $per = $per < 1 ? $per : 1;//壓縮比例不能大於1
52 $new_width = ceil($width * $per);
53 $new_height = ceil($height * $per);
54 //return $new_width . '/' . $new_height . '/' . $per . '/**2';
55 }
56 //寬度正常，高度小於最小值，計算高度最小比例
57 if ($new_width > $zip_width && $new_height < $zip_height) {
58 $formatHeight = sprintf("%.1f", $zip_height / $height);
59 $per = $formatHeight + 0.1;
60 $per = $per < 1 ? $per : 1;//壓縮比例不能大於1
61 $new_width = ceil($width * $per);
62 $new_height = ceil($height * $per);
63 //return $new_width . '/' . $new_height . '/' . $per . '/**3';
64 }
65 //return $new_width . '/' . $new_height . '/' . $per . '/**4';
66
67 switch ($type) {
68 case 1:
69 $giftype = check_gifcartoon($imgsrc);
70 if ($giftype) {
71 header('Content-Type:image/gif');
72 $image_wp = imagecreatetruecolor($new_width, $new_height);
73 $image = imagecreatefromgif($imgsrc);
74 imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
75 imagejpeg($image_wp, $imgdst, 75);
76 imagedestroy($image_wp);
77 }
78 break;
79 case 2:
80 header('Content-Type:image/jpeg');
81 $image_wp = imagecreatetruecolor($new_width, $new_height);
82 $image = imagecreatefromjpeg($imgsrc);
83 imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
84 imagejpeg($image_wp, $imgdst, 75);
85 imagedestroy($image_wp);
86 break;
87 case 3:
88 header('Content-Type:image/png');
89 $image_wp = imagecreatetruecolor($new_width, $new_height);
90 $image = imagecreatefrompng($imgsrc);
91 imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
92 imagejpeg($image_wp, $imgdst, 75);
93 imagedestroy($image_wp);
94 break;
95 }
96 }
97
98 /**
99 * desription 判断是否gif动画
100 * @param sting $image_file图片路径
101 * @return boolean t 是 f 否
102 */
103 public function check_gifcartoon($image_file)
104 {
105 $fp = fopen($image_file, 'rb');
106 $image_head = fread($fp, 1024);
107 fclose($fp);
108 return preg_match("/" . chr(0x21) . chr(0xff) . chr(0x0b) . 'NETSCAPE2.0' . "/", $image_head) ? false : true;
109 }
110 }