php 如何确定php中的最大文件上传限制
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How to determine the max file upload limit in php
提问by HyperCas
How can the file upload size allowed by php settings be determined withing a php script?
如何使用 php 脚本确定 php 设置允许的文件上传大小？
回答by HyperCas
The upload is limited by three options: upload_max_filesize, post_max_sizeand memory_limit. Your upload is only done if it doesn't exeed one of them.
上传受三个选项的限制：upload_max_filesize、post_max_size和memory_limit。您的上传只有在没有超过其中之一的情况下才会完成。
The ini_get()function provides you with a short hand of the limit and should be converted first. Thx to AoEmasterfor this.
所述ini_get（）函数为您提供了极限的短手和应首先被转换。为此向AoEmaster 致谢。
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, $memory_limit);
}
来源：http: //www.kavtheitroad.com/2010/02/php-get-the-file-uploading-limit-max-file-size-allowed-to-upload.html
回答by Gumbo
回答by Renish Khunt
You can also change that size at runtime using the .htaccess file without the need to change your php.ini file
您还可以在运行时使用 .htaccess 文件更改该大小，而无需更改 php.ini 文件
php_value upload_max_filesize 1224M
php_value post_max_size 1224M
php_value max_execution_time 3000
php_value max_input_time 3000
copy that code and put your file, then store that file with index file then you run your project you also capable to upload 1GB file
复制该代码并放置您的文件，然后将该文件与索引文件一起存储，然后运行您的项目，您还可以上传 1GB 文件
for more detail read this article
有关更多详细信息，请阅读这篇文章
回答by AoEmaster
function return_bytes($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 get_upload_max_filesize()
{
$max_upload = return_bytes(ini_get('upload_max_filesize'));
$max_post = return_bytes(ini_get('post_max_size'));
return min($max_upload, $max_post, $memory_limit);
}
回答by Sebastian Unterberg
Here's a single function, implementing the original idea from AoEmaster. The function returns integer (amount of bytes).
这是一个单一的功能，实现了 AoEmaster 的原始想法。该函数返回整数（字节数）。
function _GetMaxAllowedUploadSize(){
$Sizes = array();
$Sizes[] = ini_get('upload_max_filesize');
$Sizes[] = ini_get('post_max_size');
$Sizes[] = ini_get('memory_limit');
for($x=0;$x<count($Sizes);$x++){
$Last = strtolower($Sizes[$x][strlen($Sizes[$x])-1]);
if($Last == 'k'){
$Sizes[$x] *= 1024;
} elseif($Last == 'm'){
$Sizes[$x] *= 1024;
$Sizes[$x] *= 1024;
} elseif($Last == 'g'){
$Sizes[$x] *= 1024;
$Sizes[$x] *= 1024;
$Sizes[$x] *= 1024;
} elseif($Last == 't'){
$Sizes[$x] *= 1024;
$Sizes[$x] *= 1024;
$Sizes[$x] *= 1024;
$Sizes[$x] *= 1024;
}
}
return min($Sizes);
}
If you want, you can combine it with the following function that renders the output as a human readable text.
如果需要，您可以将其与以下将输出呈现为人类可读文本的函数结合使用。
function _Byte2Size($bytes,$RoundLength=1) {
$kb = 1024; // Kilobyte
$mb = 1024 * $kb; // Megabyte
$gb = 1024 * $mb; // Gigabyte
$tb = 1024 * $gb; // Terabyte
if($bytes < $kb) {
if(!$bytes){
$bytes = '0';
}
return (($bytes + 1)-1).' B';
} else if($bytes < $mb) {
return round($bytes/$kb,$RoundLength).' KB';
} else if($bytes < $gb) {
return round($bytes/$mb,$RoundLength).' MB';
} else if($bytes < $tb) {
return round($bytes/$gb,$RoundLength).' GB';
} else {
return round($bytes/$tb,$RoundLength).' TB';
}
}
Use it this way:
以这种方式使用它：
echo 'Max allowed upload size: '._Byte2Size(_GetMaxAllowedUploadSize());
A result could be:
结果可能是：
Max allowed upload size: 500 MB
最大允许上传大小：500 MB
回答by Liju
You can set Maximum file upload size using ini_set()
您可以使用 ini_set() 设置最大文件上传大小
ini_set('post_max_size', '64M');
ini_set('upload_max_filesize', '64M');
or using the .htaccess file
或使用 .htaccess 文件
php_value upload_max_filesize
php_value post_max_size
