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【PHP】PHP 文件上传
可乐随笔
Original
1939 people have browsed it

PHP 文件上传

1. 单文件上传

  1. <?php
  3. $imgs = [];
  4. //遍历:实现单文件/多文件上传
  5. foreach ($_FILES as $file) {
  7.     // error = 0 : 表示上传成功
  8.     if ($file['error'] == 0) {
  9.         //判断文件类型是否正确
  10.         if (strstr($file['type'], '/', true) != 'image') {
  11.             $tips = '文件类型错误';
  12.             continue;
  13.         } else {
  14.             //创建目标文件名,只要保存不重名
  15.             $targetName = 'uploads/' . md5($file['name']) . strstr($file['name'], '.');
  16.             //将文件从临时目录移动到目标目录
  17.             if (!move_uploaded_file($file['tmp_name'], $targetName)) {
  18.                 $tips = '文件移动失败';
  19.             } else {
  20.                 //将上传的目标文件名保存到一个数组,供当前页面进行预览
  21.                 $imgs[] = $targetName;
  22.             }
  23.         }
  24.     }
  25. }
  27. printf('<pre>%s</pre>', print_r($imgs, true));
  29. ?>
  31. <!DOCTYPE html>
  32. <html lang="en">
  34. <head>
  35.     <meta charset="UTF-8">
  36.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  37.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  38.     <title>文件上传</title>
  39. </head>
  41. <body>
  42.     <!-- 
  43.         文件上传表单的属性要求
  44.         1.action : 为空,表示上传到当前页面
  45.         2.method : post 
  46.         3.enctype : multipart/form-data"
  47.     -->
  48.     <form action="" method="post" enctype="multipart/form-data">
  49.         <fieldset>
  50.             <legend>文件上传</legend>
  51.             <input type="file" name="my_pic1">
  52.             <input type="file" name="my_pic2">
  53.             <input type="file" name="my_pic3">
  54.             <button>上传</button>
  55.         </fieldset>
  56.     </form>
  57.     <!-- 判断是否有错误 -->
  58.     <?php if (isset($tips)) : ?>
  59.         <!-- 显示错误 -->
  60.         <?= $tips ?>
  61.     <?php elseif (count($imgs)) : ?>
  62.         <!-- 预览当前图片 -->
  63.         <?php foreach ($imgs as $img) :?>
  64.             <img src="<?= $img?>" width="200">
  65.         <?php endforeach;?>
  66.     <?php endif; ?>
  67. </body>
  69. </html>

2. 多文件上传（批量）

  1. <?php
  3. $imgs = [];
  4. //遍历:实现单文件/多文件上传
  6. //判断是否上传
  7. if (!isset($_FILES['my_pic'])) {
  8.     $tips = '没有文件上传';
  9. } else {
  10.     foreach ($_FILES['my_pic']['error'] as $key => $error) {
  12.         // error = 0 : 表示上传成功
  13.         if ($error == 0) {
  14.             //判断文件类型是否正确
  15.             $file = $_FILES['my_pic'];
  16.             //根据 error 的 key 来获取对应的文件名,类型,临时文件名等
  18.             if (strstr($file['type'][$key], '/', true) != 'image') {
  19.                 $tips = '文件类型错误';
  20.                 continue;
  21.             } else {
  22.                 //创建目标文件名,只要保存不重名
  23.                 $targetName = 'uploads/' . md5($file['name'][$key]) . strstr($file['name'][$key], '.');
  24.                 //将文件从临时目录移动到目标目录
  25.                 if (!move_uploaded_file($file['tmp_name'][$key], $targetName)) {
  26.                     $tips = '文件移动失败';
  27.                 } else {
  28.                     //将上传的目标文件名保存到一个数组,供当前页面进行预览
  29.                     $imgs[] = $targetName;
  30.                 }
  31.             }
  32.         }
  33.     }
  34. }
  38. ?>
  40. <!DOCTYPE html>
  41. <html lang="en">
  43. <head>
  44.     <meta charset="UTF-8">
  45.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  46.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  47.     <title>文件批量上传</title>
  48. </head>
  50. <body>
  52.     <form action="" method="post" enctype="multipart/form-data">
  53.         <fieldset>
  54.             <!-- 
  55.                 多文件上传:
  56.                 1.name为数组:my_pic[]
  57.                 2.multiple 属性
  58.              -->
  59.             <legend>文件上传</legend>
  60.             <input type="file" name="my_pic[]" multiple>
  61.             <button>上传</button>
  62.         </fieldset>
  63.     </form>
  64.     <!-- 判断是否有错误 -->
  65.     <?php if (isset($tips)) : ?>
  66.         <!-- 显示错误 -->
  67.         <?= $tips ?>
  68.     <?php elseif (count($imgs)) : ?>
  69.         <!-- 预览当前图片 -->
  70.         <?php foreach ($imgs as $img) : ?>
  71.             <img src="<?= $img ?>" width="200">
  72.         <?php endforeach; ?>
  73.     <?php endif; ?>
  74. </body>
  76. </html>
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