如何确定PHP中的最大文件上传限制 [英] How to determine the max file upload limit in php
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问题描述
如何使用php脚本确定php设置允许的文件上传大小?
How can the file upload size allowed by php settings be determined withing a php script?
推荐答案
上传受三个选项限制: upload_max_filesize , post_max_size 和 memory_limit >.您的上传只有在没有其中之一的情况下才能完成.
The upload is limited by three options: upload_max_filesize, post_max_size and memory_limit. Your upload is only done if it doesn't exeed one of them.
ini_get()函数为您提供了一个简短的限制,应该首先进行转换.为此,请转至 AoEmaster .
The ini_get() function provides you with a short hand of the limit and should be converted first. Thx to AoEmaster for this.
function return_bytes($val) {
$val = trim($val);
$last = strtolower($val[strlen($val)-1]);
switch($last)
{
case 'g':
$val *= 1024;
case 'm':
$val *= 1024;
case 'k':
$val *= 1024;
}
return $val;
}
function max_file_upload_in_bytes() {
//select maximum upload size
$max_upload = return_bytes(ini_get('upload_max_filesize'));
//select post limit
$max_post = return_bytes(ini_get('post_max_size'));
//select memory limit
$memory_limit = return_bytes(ini_get('memory_limit'));
// return the smallest of them, this defines the real limit
return min($max_upload, $max_post, $memory_limit);
}
来源: http://www.kavoir.com/2010/02/php-get-the-file-uploading-limit-max-file-size-allowed-to-upload.html
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