来源：http://www.ido321.com/887.html
5、PHP对图像的旋转
1: <div>
2: <h4>旋转之前</h4>
3: <img src="1.png" style="border:1px solid red;">
4: </div>
5: <?php
6: header("content-type","text/html;charset=utf-8");
7:
8: /*
9: *图片沿y轴旋转,以png格式为例
10: *@param string $filename 图片的url
11: */
12: function turn_y($filename)
13: {
14: /*创建图片资源*/
15: $backy = imagecreatefrompng($filename);
16:
17: /*获取大小*/
18: $widthy = imagesx($backy);
19: $heighty = imagesy($backy);
20:
21: /*创建新的图片资源，保存翻转后的图片*/
22: $newy = imagecreatetruecolor($widthy, $heighty);
23:
24: /*沿着y轴翻转，就是将原图从右向左按一个像素宽度向新资源中逐个复制*/
25: for ($i=0; $i < $widthy; $i++) {
26: imagecopy($newy,$backy,$widthy-$i-1,0,$i,0,1,$heighty);
27: }
28:
29: /*保存翻转后的图片*/
30: imagepng($newy,'test3.png');
31:
32: /*释放资源*/
33: imagedestroy($backy);
34: imagedestroy($newy);
35: }
36:
37: /*
38: *图片沿x轴旋转,以png格式为例
39: *@param string $filename 图片的url
40: */
41: function turn_x($filename)
42: {
43: /*创建图片资源*/
44: $backx = imagecreatefrompng($filename);
45:
46: /*获取大小*/
47: $widthx = imagesx($backx);
48: $heightx = imagesy($backx);
49:
50: /*创建新的图片资源，保存翻转后的图片*/
51: $newx = imagecreatetruecolor($widthx, $heightx);
52:
53: /*沿着x轴翻转，就是将原图从上到下按一个像素宽度向新资源中逐个复制*/
54: for ($i=0; $i < $heightx; $i++) {
55: imagecopy($newx,$backx,0,$heightx-$i-1,0,$i,$widthx,1);
56: }
57:
58: /*保存翻转后的图片*/
59: imagepng($newx,'test4.png');
60:
61: /*释放资源*/
62: imagedestroy($backx);
63: imagedestroy($newx);
64: }
65: /*调用函数*/
66: turn_y('1.png');
67: turn_x('1.png');
68: ?>
69: <div style="float:left">
70: <h4>沿着y轴旋转</h4>
71: <img src="test3.png" style="border:1px solid red;">
72: </div>
73: <div style="float:left">
74: <h4>沿着x轴旋转</h4>
75: <img src="test4.png" style="border:1px solid red;">
76: </div>
效果