jkuchar/BigFileTools

<?php

namespace BigFileTools\Driver;

use Brick\Math\BigInteger;

class NativeReadDriver implements ISizeDriver
{
    /**
     * Returns file size by reading whole files and counting read bites
     * @link http://stackoverflow.com/questions/5501451/php-x86-how-to-get-filesize-of-2gb-file-without-external-program/5504829#5504829
     * @inheritdoc
     */
    public function getFileSize($path)
    {
        $fp = fopen($path, "rb");
        if (!$fp) {
            throw new Exception("Cannot read from file.");
        }

        flock($fp, LOCK_SH);
        rewind($fp);
        $fileSize = BigInteger::zero();
        $chunkSize = 1024 * 1024;
        while (!feof($fp)) {
            $readBytes = strlen(fread($fp, $chunkSize));
            $fileSize = $fileSize->plus($readBytes);
        }
        flock($fp, LOCK_UN);
        fclose($fp);
        return $fileSize;
    }
}