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PHP文件上传的各种处理
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PHP文件上传的处理方法

PHP文件上传配置文件

序号 配置项 默认值 描述
1 file_uploads On 使 PHP 支持文件上传
2 upload_tmp_dir /tmp 指示应该临时把上传的文件存储在什么位置
3 max_file_uploads 20 单次请求时允许上传的最大文件数量
4 max_execution_time 30 设置脚本被解析器终止之前PHP最长执行时间(秒) ,防止服务器资源被耗尽
5 max_input_time 60 设置 PHP 通过 POST/GET/PUT 解析接收数据的时长(秒)
6 memory_limit 128M 系统分配给当前脚本执行可用的最大内存容量
7 post_max_size 8M 允许的 POST 数据的总大小
8 upload_max_filesize 32M 允许的尽可能最大的文件上传

上传文件的描述信息,全部保存在系统全局变量$_FILES中$_FILES以二维数组形式保存:$_FILES[‘form_file_name’][‘key’];

form_file_name: 对应着表单中<input type="file" name="my_pic">中name属性值

key:共有 5 个键名, 描述如下:

  • name :文件在客户端的原始文件名(即存在用户电脑上的文件名);
  • type: 文件的 MIME 类型, 由浏览器提供, PHP 并不检查它;
  • tmp_name: 文件被上传到服务器上之后,在临时目录中临时文件名;
  • error : 和该文件上传相关的错误代码;
  • size : 已上传文件的大小(单位为字);

处理文件上传方式

  1. <?php
  2.     printf('<pre>%s</pre>',print_r($_FILES,true));
  3.     $tmpFileName =  $_FILES['my_pic']['tmp_name'];
  4.     $originalFileName =  $_FILES['my_pic']['name'];
  6.     if(is_uploaded_file($tmpFileName))
  7.      echo "{$originalFileName}:上传方式合法";
  10. ?>
  11. <!DOCTYPE html>
  12. <html lang="en">
  13. <head>
  14.     <meta charset="UTF-8">
  15.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  16.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  17.     <title>文件上传变量$_FILES</title>
  18. </head>
  19. <body>
  21.     <!-- <form action="" method="post" enctype="application/x-www-form-urlencoded"> -->
  22.     <form action="" method="post" enctype="multipart/form-data">
  23.         <fieldset>
  24.             <legend>单文件上传</legend>
  25.             <input type="file" name="my_pic">
  26.             <button>上传</button>
  27.         </fieldset>
  28.     </form>
  29. </body>
  30. </html>

PHP 文件上传的错误类型

文件上传错误信息描述

序号 常量 值 描述
1 UPLOAD_ERR_OK 0 没有错误发生,文件上传成功
2 UPLOAD_ERR_INI_SIZE 1 文件超过php.ini中upload_max_filesize值
3 UPLOAD_ERR_FORM_SIZE 2 文件大小超过表单中MAX_FILE_SIZE指定的值
4 UPLOAD_ERR_PARTIAL 3 文件只有部分被上传
5 UPLOAD_ERR_NO_FILE 4 没有文件被上传
6 UPLOAD_ERR_NO_TMP_DIR 6 找不到临时文件夹
7 UPLOAD_ERR_CANT_WRITE 7 文件写入失败

根据上传文件的错误类型判断

  1. <?php
  2.     printf('<pre>%s</pre>',print_r($_FILES,true));
  4.     $errorCode = $_FILES['my_pic']['error'];
  6.     if($errorCode ===4 ) echo '没有文件上传';
  7.     //两种方式检查
  8.     //if(empty($_FILES['my_pic']['name'])) echo '没有文件传';
  10. ?>
  11. <!DOCTYPE html>
  12. <html lang="en">
  13. <head>
  14.     <meta charset="UTF-8">
  15.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  16.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  17.     <title>文件上传变量$_FILES</title>
  18. </head>
  19. <body>
  21.     <!-- <form action="" method="post" enctype="application/x-www-form-urlencoded"> -->
  22.     <form action="" method="post" enctype="multipart/form-data">
  23.         <fieldset>
  24.             <legend>单文件上传</legend>
  25.             <input type="file" name="my_pic">
  26.             <button>上传</button>
  27.         </fieldset>
  28.     </form>
  29. </body>
  30. </html>

处理文件类型是否符合要求 要求后缀是 ‘jpg’,’jpeg’,’png’,’wbmp’,’gif’

  1. <?php
  2. //$_FILES;
  3.     printf('<pre>%s</pre>',print_r($_FILES,true));
  5.     $fileType = $_FILES['my_pic']['type'];
  6.     echo $fileType,'<br>';
  7.     //print_r(explode('/',$fileType)[0]);
  8.     echo strstr($fileType,'/',true);
  9.     echo '<br>';
  10.     $allow = ['jpg','jpeg','png','wbmp','gif'];
  11.     $extension = pathinfo($_FILES['my_pic']['name'])['extension'];
  12.     echo $extension;
  13.     if(!in_array($extension,$allow)){echo '文件类型不正确';}
  14.     else{
  15.         echo '合法的文件类型';
  16.     }
  18.     //if(strstr($fileType,'/',true) !== 'image')
  19.     //echo '<p>文件类型错误</p>';
  21. ?>
  22. <!DOCTYPE html>
  23. <html lang="en">
  24. <head>
  25.     <meta charset="UTF-8">
  26.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  27.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  28.     <title>文件上传变量$_FILES</title>
  29. </head>
  30. <body>
  31.     <hr>
  32.     <!-- <form action="" method="post" enctype="application/x-www-form-urlencoded"> -->
  33.     <form action="" method="post" enctype="multipart/form-data">
  34.         <fieldset>
  35.             <legend>单文件上传:检测文件类型</legend>
  36.             <input type="file" name="my_pic">
  37.             <button>上传</button>
  38.         </fieldset>
  39.     </form>
  40. </body>
  41. </html>

检查文件上传内容不超过5M

用ini_get(‘uplond_max_filesize’)检测文件上传的最大值,将配置文件里的上传最大值改为5M;

  1. <?php
  3. printf('<pre>%s</pre>',print_r($_FILES,true));
  5. echo ini_get('upload_max_filesize');
  6. ini_set('upload_max_filesize','5M');
  8. ?>
  9. <!DOCTYPE html>
  10. <html lang="en">
  11. <head>
  12.     <meta charset="UTF-8">
  13.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  14.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  15.     <title>文件上传变量$_FILES</title>
  16. </head>
  17. <body>
  19.     <!-- <form action="" method="post" enctype="application/x-www-form-urlencoded"> -->
  20.     <form action="" method="post" enctype="multipart/form-data">
  21.         <fieldset>
  22.             <legend>单文件上传</legend>
  23.             <input type="hidden" name="MAX_FILE_SIZE" value="5524880">
  24.             <input type="file" name="my_pic">
  25.             <button>上传</button>
  26.         </fieldset>
  27.     </form>
  28. </body>
  29. </html>

PHP文件上传,多文件上传:逐个上传

  2. <?php
  3. printf('<pre>%s</pre>',print_r($_FILES,true));
  4. foreach ($_FILES as $file) {
  5.     if($file['error'] == 0)
  6.     {
  7.        $destFile = 'upload/'.$file['name'];
  8.        move_uploaded_file($file['tmp_name'],$destFile);
  9.        echo "<img src='{$destFile}' width ='150'>";
  10.     }
  11. }
  14. ?>
  15. <!DOCTYPE html>
  16. <html lang="en">
  17. <head>
  18.     <meta charset="UTF-8">
  19.     <meta http-equiv="X-UA-Compatible" content="IE=edge">
  20.     <meta name="viewport" content="width=device-width, initial-scale=1.0">
  21.     <title>文件上传变量$_FILES</title>
  22. </head>
  23. <body>
  25.     <!-- <form action="" method="post" enctype="application/x-www-form-urlencoded"> -->
  26.     <form action="" method="post" enctype="multipart/form-data">
  27.         <fieldset>
  28.             <legend>多文件上传:逐个上传</legend>
  29.             <input type="hidden" name="MAX_FILE_SIZE" value="5524880">
  30.             <input type="file" name="my_pic1">
  31.             <input type="file" name="my_pic2">
  32.             <input type="file" name="my_pic3">
  33.             <button>上传</button>
  34.         </fieldset>
  35.     </form>
  36. </body>
  37. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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