[PHP] 超全局变量$_FILES上传文件详解编程语言

1.$_FILES –超全局变量,HTTP 文件上传变量

通过 HTTP POST 方式上传到当前脚本的项目的数组,PHP 能够接受任何来自符合 RFC-1867 标准的浏览器上传的文件,

上传的过程中,文件存放在/tmp/phpXxXxx里,有的时候磁盘满了,/tmp/下放不了文件也会报错

2.RFC 1867标准

RFC 1867 – Form-based File Upload in HTML

<FORM ENCTYPE=”multipart/form-data” ACTION=”_URL_” METHOD=POST>

File to process: <INPUT NAME=”userfile1″ TYPE=”file”>

<INPUT TYPE=”submit” VALUE=”Send File”>

</FORM>

2.move_uploaded_file ( string $filename , string $destination )

将上传的文件移动到新位置,企邮默认从/tmp/phpxxxx到/mnt/entmail/webapp/uploads

3.上传多个文件

<input name=”userfile[]” type=”file” /><br />

<input name=”userfile[]” type=”file” /><br />

获取$_FILES[‘userfile’][‘tmp_name’][0],$_FILES[‘userfile’][‘tmp_name’][1]

5.对 PUT 方法的支持,使用标准的输入流,$putdata = fopen(“php://stdin”, “r”);

<?php 
/* PUT data comes in on the stdin stream */ 
$putdata = fopen("php://stdin", "r"); 
 
/* Open a file for writing */ 
$fp = fopen("myputfile.ext", "w"); 
 
/* Read the data 1 KB at a time 
   and write to the file */ 
while ($data = fread($putdata, 1024)) 
  fwrite($fp, $data); 
 
/* Close the streams */ 
fclose($fp); 
fclose($putdata); 
?>