读取大于2GB以上的文件

get_safe_filesize.php

<?php
function get_safe_filesize($file)
{
    $size = filesize($file);
    if ($size <= 0) {
        if (!(strtoupper(substr(PHP_OS, 0, 3)) == 'WIN')) {
            $size = trim(`stat -c%s $file`);
        } else {
            $fsobj = new COM("Scripting.FileSystemObject");
            $f = $fsobj->GetFile($file);
            $size = $f->Size;
        }
    }

    return $size;
}