<?php
/**
* Return file size (even for file > 2 Gb)
* For file size over PHP_INT_MAX (2 147 483 647), PHP filesize function loops from -PHP_INT_MAX to PHP_INT_MAX.
*
* @param string $path Path of the file
* @return mixed File size or false if error
*/
function realFileSize($path)
{
if (!file_exists($path))
return false;
$size = filesize($path);
if (!($file = fopen($path, 'rb')))
return false;
if ($size >= 0)
{//Check if it really is a small file (< 2 GB)
if (fseek($file, 0, SEEK_END) === 0)
{//It really is a small file
fclose($file);
return $size;
}
}
//Quickly jump the first 2 GB with fseek. After that fseek is not working on 32 bit php (it uses int internally)
$size = PHP_INT_MAX - 1;
if (fseek($file, PHP_INT_MAX - 1) !== 0)
{
fclose($file);
return false;
}
$length = 1024 * 1024;
while (!feof($file))
{//Read the file until end
$read = fread($file, $length);
$size = bcadd($size, $length);
}
$size = bcsub($size, $length);
$size = bcadd($size, strlen($read));
fclose($file);
return $size;
}