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PHP中实例演示单文件上传与多文件上传
千里马遇伯乐
Original
762 people have browsed it

单文件上传

  1. <!DOCTYPE html>
  2.     <html lang="en">
  3.     <?php
  4.         // $_FILES: PHP超全局变量数量，保存着上传文件的全部信息
  5.         printf('<pre>%s</pre>',print_r($_FILES,true));
  6.         /**
  7.      * 1. $_FILES: 二维数组,每个元素对应一个上传的文件
  8.      * 2. name: 原始文件名
  9.      * 3. type: 文件类型, mime类型
  10.      * 4. tmp_name: 临时目录
  11.      * 5. error: 错误代码
  12.      * 5. size: 文件大小(字节表示 byte)
  13.      */
  14.     if (isset($_FILES['my_pic'])) {
  15.         $name = $_FILES['my_pic']['name'];
  16.         $tmpName = $_FILES['my_pic']['tmp_name'];
  17.         $error = $_FILES['my_pic']['error'];
  18.         if ($error>0) {
  19.             $tips = '<span style="color:red">上传失败:</span>';
  20.             switch ($error) {
  21.                 case 1:
  22.                     $tips .= '上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值';
  23.                     break;
  24.                 case 2:
  25.                     $tips .= '文件大小超过了上传表单中MAX_FILE_SIZE最大值';
  26.                     break;
  27.                 case 3:
  28.                     $tips .= '文件只有部分被上传';
  29.                     break;
  30.                 case 4:
  31.                     $tips .= '没有文件被上传';
  32.                     break;
  33.                 case 6:
  34.                     $tips .= '找不到临时目录';
  35.                     break;
  36.                 case 7:
  37.                     $tips .= '文件写入失败,请检查目录权限';
  38.                     break;
  39.             }
  40.             echo "<p>$tips</p>";
  41.         } else {
  42.             // 判断用户是不是通过合法的POST方式上传
  43.             if (is_uploaded_file($tmpName)) {
  44.                 // 设置允许上传文件类型的白名单
  45.                 $allow = ['jpg','jpeg', 'png', 'gif'];
  46.                 // printf('<pre>%s</pre>',print_r(pathinfo($name),true));
  47.                 // 获取文件扩展名
  48.                 $ext = pathinfo($name)['extension'];
  49.                 echo $ext.'<br>';
  50.                 if (in_array($ext, $allow)) {
  51.                     // 二个条件都满足了
  52.                     // 1. post方式上传的 2. 文件类型是合法的
  53.                     // 目标目录
  54.                     $path = 'uploads/';
  55.                     // 自定义目标文件名
  56.                     $dest = $path . md5($name) . '.' . $ext;
  57.                     echo $dest;
  58.                     // 将文件从临时目录中移动到目标目录中并重命名
  59.                     if (move_uploaded_file($tmpName, $dest)) {
  60.                         echo '<p style="color:green">上传成功</p>';
  61.                         // 预览
  62.                         echo "<img src='$dest' width='200' >";
  63.                     } else {
  64.                         echo '<p style="color:red">移动失败</p>';
  65.                     }
  66.                 } else {
  67.                     echo '<p style="color:red">文件类型错误</p>';
  68.                 }
  69.             } else {
  70.                 echo '<p style="color:red">非法方式上传</p>';
  71.             }
  72.         }
  73.     }
  74.     ?>
  75.     <head>
  76.         <meta charset="UTF-8">
  77.         <meta http-equiv="X-UA-Compatible" content="IE=edge">
  78.         <meta name="viewport" content="width=device-width, initial-scale=1.0">
  79.         <title>文件上传的表单构造,超全局变量$_FILE</title>
  80.     </head>
  81.     <body>
  82.         <!-- 允许上传文件的表单特征
  83.         1. method="POST"
  84.         2. enctype="multipart/form-data" -->
  85.         <form action="" method="POST" enctype="multipart/form-data">
  86.             <fieldset>
  87.                 <legend>单文件上传</legend>
  88.                 <!-- 浏览器中限制上传文件的大小，写到一个隐藏域中，并写到type=file之前 -->
  89.                 <input type="hidden" name="MAX_FILE_SIZE" value="300000">
  90.                 <input type="file" name="my_pic">
  91.                 <button>上传</button>
  92.             </fieldset>
  93.         </form>
  94.     </body>
  95.     </html>

效果如下

多文件上传

  1.     <!DOCTYPE html>
  2.     <html lang="en">
  3.     <?php
  4.     // $_FILES：PHP超全局变量数量，保存着上传文件的全部信息
  5.     // printf('<pre>%s</pre>',print_r($_FILES,true));
  6.     foreach ($_FILES as $file) {
  7.         //$file中保存着每一个文件的信息
  8.         // printf('<pre>%s</pre>', print_r($_FILES, true));
  9.         if ($file['error']===0) {
  10.             $destFile = 'uploads/' . $file['name'];
  11.             move_uploaded_file($file['tmp_name'],$destFile);
  12.             echo "<img src='$destFile' width='200'>";
  13.         }
  14.     }
  15.     ?>
  16.     <head>
  17.         <meta charset="UTF-8">
  18.         <meta http-equiv="X-UA-Compatible" content="IE=edge">
  19.         <meta name="viewport" content="width=device-width, initial-scale=1.0">
  20.         <title>多文件上传</title>
  21.     </head>
  22.     <body>
  23.         <form action="" method="POST" enctype="multipart/form-data">
  24.             <fieldset>
  25.                 <legend>多文件上传：逐个上传</legend>
  26.                 <input type="file" name="my_pic1">
  27.                 <input type="file" name="my_pic2">
  28.                 <input type="file" name="my_pic3">
  29.                 <input type="file" name="my_pic4">
  30.                 <button>上传</button>
  31.             </fieldset>
  32.         </form>
  33.     </body>
  34.     </html>

多文件上传效果

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