Bytes.php

<?php

namespace Drupal\Component\Utility;


/**
 * Provides helper methods for byte conversions.
 */
class Bytes {
    
    /**
     * The number of bytes in a kilobyte.
     *
     * @see http://wikipedia.org/wiki/Kilobyte
     */
    const KILOBYTE = 1024;
    
    /**
     * Parses a given byte size.
     *
     * @param mixed $size
     *   An integer or string size expressed as a number of bytes with optional SI
     *   or IEC binary unit prefix (e.g. 2, 3K, 5MB, 10G, 6GiB, 8 bytes, 9mbytes).
     *
     * @return int
     *   An integer representation of the size in bytes.
     */
    public static function toInt($size) {
        // Remove the non-unit characters from the size.
        $unit = preg_replace('/[^bkmgtpezy]/i', '', $size);
        // Remove the non-numeric characters from the size.
        $size = preg_replace('/[^0-9\\.]/', '', $size);
        if ($unit) {
            // Find the position of the unit in the ordered string which is the power
            // of magnitude to multiply a kilobyte by.
            return round($size * pow(self::KILOBYTE, stripos('bkmgtpezy', $unit[0])));
        }
        else {
            // Ensure size is a proper number type.
            return round((double) $size);
        }
    }

}