Php Image Resize图片大小调整的函数代码

1. 
   
2. function my_image_resize($src_file, $dst_file, $dst_width=32, $dst_height=32) {
   
3. if($dst_width <1 || $dst_height <1) {
   
4. echo "params width or height error !";
   
5. exit();
   
6. }
   
7. if(!file_exists($src_file)) {
   
8. echo $src_file . " is not exists !";
   
9. exit();
   
10. }
    
11. 
    
12. $type=exif_imagetype($src_file);
    
13. $support_type=array(IMAGETYPE_JPEG , IMAGETYPE_PNG , IMAGETYPE_GIF);
    
14. 
    
15. if(!in_array($type, $support_type,true)) {
    
16. echo "this type of image does not support! only support jpg , gif or png";
    
17. exit();
    
18. }
    
19. 
    
20. switch($type) {
    
21. case IMAGETYPE_JPEG :
    
22. $src_img=imagecreatefromjpeg($src_file);
    
23. break;
    
24. case IMAGETYPE_PNG :
    
25. $src_img=imagecreatefrompng($src_file);
    
26. break;
    
27. case IMAGETYPE_GIF :
    
28. $src_img=imagecreatefromgif($src_file);
    
29. break;
    
30. default:
    
31. echo "Load image error!";
    
32. exit();
    
33. }
    
34. $src_w=imagesx($src_img);
    
35. $src_h=imagesy($src_img);
    
36. $ratio_w=1.0 * $dst_width/$src_w;
    
37. $ratio_h=1.0 * $dst_height/$src_h;
    
38. if ($src_w<=$dst_width && $src_h<=$dst_height) {
    
39. $x = ($dst_width-$src_w)/2;
    
40. $y = ($dst_height-$src_h)/2;
    
41. $new_img=imagecreatetruecolor($dst_width,$dst_height);
    
42. imagecopy($new_img,$src_img,$x,$y,0,0,$dst_width,$dst_height);
    
43. switch($type) {
    
44. case IMAGETYPE_JPEG :
    
45. imagejpeg($new_img,$dst_file,100);
    
46. break;
    
47. case IMAGETYPE_PNG :
    
48. imagepng($new_img,$dst_file);
    
49. break;
    
50. case IMAGETYPE_GIF :
    
51. imagegif($new_img,$dst_file);
    
52. break;
    
53. default:
    
54. break;
    
55. }
    
56. } else {
    
57. $dstwh = $dst_width/$dst_height;
    
58. $srcwh = $src_w/$src_h;
    
59. if ($ratio_w <= $ratio_h) {
    
60. $zoom_w = $dst_width;
    
61. $zoom_h = $zoom_w*($src_h/$src_w);
    
62. } else {
    
63. $zoom_h = $dst_height;
    
64. $zoom_w = $zoom_h*($src_w/$src_h);
    
65. }
    
66. 
    
67. $zoom_img=imagecreatetruecolor($zoom_w, $zoom_h);
    
68. imagecopyresampled($zoom_img,$src_img,0,0,0,0,$zoom_w,$zoom_h,$src_w,$src_h);
    
69. $new_img=imagecreatetruecolor($dst_width,$dst_height);
    
70. $x = ($dst_width-$zoom_w)/2;
    
71. $y = ($dst_height-$zoom_h)/2+1;
    
72. imagecopy($new_img,$zoom_img,$x,$y,0,0,$dst_width,$dst_height);
    
73. switch($type) {
    
74. case IMAGETYPE_JPEG :
    
75. imagejpeg($new_img,$dst_file,100);
    
76. break;
    
77. case IMAGETYPE_PNG :
    
78. imagepng($new_img,$dst_file);
    
79. break;
    
80. case IMAGETYPE_GIF :
    
81. imagegif($new_img,$dst_file);
    
82. break;
    
83. default:
    
84. break;
    
85. }
    
86. }
    
87. }

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