本文章是一款图片上传代码,他可以把上传到服务器的图片在进行预览修改,如果是你想的你就可以保存了,不是可以删除再重新上传,实例代码如下:

1. if(!isset($_session))session_start();
2. /**2010-6-22
3. * $data 数组类型 包含以下变量
4. -------------------------------
5. * $sub_type submit类型(upload：上传按钮 delete：删除按钮)，默认upload
6. * $file 通过表单获取的$_files['filename']数组
7. * $img_tag_id 预览图片的<img>的id值
8. * $img_dir 上传图片的目录
9. * $max_file_size 单位m(兆)，默认：1m
10. * $type_array 允许的上传的图片类型(默认：image/pjpeg、image/jpeg、image/gif)
11. **/
12. function upload($data){
13. if(!$data['file']){
14. echo '<script>alert("file不能为空！");</script>';exit;
15. }
16. if(!$data['img_tag_id']){
17. echo '<script>alert("预览图片标签id不能为空！");</script>';exit;
18. }
19. if(!$data['img_dir']){
20. echo '<script>alert("图片上传目录不能为空！");</script>';exit;
21. }
22. if(!isset($data['max_file_size'])){
23. $data['max_file_size'] = 1024 * 1024;
24. }else{
25. $data['max_file_size'] = $data['max_file_size'] * 1024 * 1024;
26. }
27. if(!isset($data['type_array'])){
28. $data['type_array'] = array('image/pjpeg', 'image/jpeg', 'image/gif');
29. }
30. if(!isset($data['sub_type'])){
31. $data['sub_type'] = 'upload';
32. }
33. $imgpath = '';
34. if(isset($data['sub_type']) && $data['sub_type'] == 'delete'){
35. if(isset($_session['name']) && $_session['name']){
36. if(is_file($_session['imgpath'])){
37. $b = unlink($_session['imgpath']);
38. }
39. unset($_session['name'], $_session['imgpath']);
40. if(!isset($_session['name'])){
41. echo '<script>alert("删除成功！");</script>';
42. echo '<script>parent.document.getelementbyid("'.$data['img_tag_id'].'").style.display = "none";</script>';
43. }else{
44. echo '<script>alert("删除失败！");</script>';
45. }
46. }else{
47. echo '<script>alert("没有稿件！");</script>';
48. }exit;
49. }
50. if(isset($_session['imgpath']) && $_session['imgpath']){
51. echo '<script>alert("稿件已经存在，要想重新上传请删除原来的稿件！");</script>';exit;
52. }
53. if(!in_array($data['file']['type'], $data['type_array'])){
54. echo '<script>alert("稿件类型不匹配，请上传.jpg、.gif和.png格式的图片！");</script>';exit;
55. }
56. if($data['file']['size'] > $data['max_file_size']){
57. echo '<script>alert("您上传的稿件过大，请选择2m以下的图片上传！");</script>';exit;
58. }
59. if(!is_dir($data['img_dir'])){
60. @mkdir($data['img_dir'], 0777, true);
61. }
62. $imgpath = $data['img_dir'].'/'.date('his', time()).rand(100, 999).$data['file']['name'];
63. $isupload = move_uploaded_file($data['file']['tmp_name'], $imgpath);
64. if(!$isupload){
65. echo '<script>alert("稿件上传失败，请尝试重新上传！");</script>';exit;
66. }else{
67. echo '<script>alert("稿件上传成功！");</script>';
68. }
69. $_session['name'] = $data['file']['name'];
70. $_session['imgpath'] = $imgpath;
71. return $imgpath;
72. }
73. /*test_start*/
74. $sub_type = '';
75. if(isset($_post['submit_upload']))$sub_type = 'upload';
76. if(isset($_post['submit_delete']))$sub_type = 'delete';
77. if($sub_type){//echo '<script>alert("'.$sub_type.'");</script>';exit;
78. $data = array( 'sub_type' => $sub_type,
79. 'file' => $_files['file'],
80. 'img_tag_id' => 'picview',
81. 'img_dir' => 'upload_img',
82. );
83. $imgpath = upload($data);
84. }else{
85. $imgpath = isset($_session['imgpath'])? $_session['imgpath']: '';
86. }
87. ?>
88. <form action="ad.php" method="post" enctype="multipart/form-data" target="frame">
89. <input type="file" name="file" class="input">
90. <input type="submit" name="submit_upload" value="上 传">
91. <input type="submit" name="submit_delete" value="删 除">
92. <iframe name="frame" width="0" height="0" marginwidth="0" frame src="about:blank"></iframe>
93. </form>
94. <img height="100" >
95. //开源代码phpfensi.com
96. <script>
97. if("<?php echo $imgpath; ?>"){
98. parent.document.getelementbyid("picview").src = "<?php echo $imgpath; ?>";
99. parent.document.getelementbyid("picview").style.display = "block";
100. }
101. </script>