filesize()

(PHP 4, PHP 5, PHP 7)

取得文件大小

说明

取得指定文件的大小。

参数

文件的路径。

返回值

返回文件大小的字节数，如果出错返回FALSE并生成一条E_WARNING级的错误。

Note:因为 PHP 的整数类型是有符号整型而且很多平台使用 32 位整型，对 2GB以上的文件，一些文件系统函数可能返回无法预期的结果。

范例

Example #1filesize()例子

错误／异常

失败时抛出E_WARNING警告。

注释

Note:此函数的结果会被缓存。参见clearstatcache()以获得更多细节。

自 PHP 5.0.0 起,此函数也用于某些URL 包装器。请参见支持的协议和封装协议以获得支持stat()系列函数功能的包装器列表。

参见

• file_exists() 检查文件或目录是否存在

Extremely simple function to get human filesize. 

function dir_size($file) {
  //tested on win 7x64 php 5.4 
  exec('dir /s /a "' . $file.'"', $inf);
  $r=explode(' ',$inf[count($inf)-2]);
  $rr = preg_replace('~[^\d]+~','',$r[count($r)-2]);
  return $rr;
}

if you recently appended something to file, and closed it then this method will not show appended data:

You should insert a call to clearstatcache() before calling filesize()
I've spent two hours to find that =/

// best converting the negative number with File Size . 
// does not work with files greater than 4GB
//
// specifically for 32 bit systems. limit conversions filsize is 4GB or 
// 4294967296. why we get negative numbers? by what the file 
// pointer of the meter must work with the PHP MAX value is 2147483647.
// Offset file : 0 , 1 , 2 , 3 , ... 2147483647 = 2GB 
// to go higher up the 4GB negative numbers are used
// and therefore after 2147483647, we will -2147483647
// -2147483647, -2147483646, -2147483645, -2147483644 ... 0 = 4GB
// therefore 0, 2147483647 and -2147483647 to 0. all done 4GB = 4294967296
// the first offset to 0 and the last offset to 0 of 4GB should be added in 
// your compute, so "+ 2" for the number of bytes exate . 

Slightly edited version of the function from rommel at rommelsantor dot com. Now it returns a two characters file size which is a bit more convenient to read.

I removed the P units because strlen doesn't seem to work as expected with integers longer than 14 digits. Though it might be only my system's limitation.

For files bigger then 2 GB use my library called Big File Tools. https://github.com/jkuchar/BigFileTools. More details on stackoverflow: http://stackoverflow.com/a/35233556/631369

The simplest and most efficient implemention for getting remote filesize: 

In case of you have a redirection in the server (like Redirect Permanent in the .htaccess)
In this case we have for exemple:
  [content-length] => Array
    (
      [0] => 294     // Size requested file
      [1] => 357556   // Real Size redirected file
    )

This functions returns the exact file size for file larger than 2 GB on 32 bit OS:

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