Get File Size in reader-friendly units (KB, MB, etc.) using PHP

web-snippet-040 ( Get File Size in PHP )

<?php
/**
 * Get the size of a file in reader-friendly units (KB, MB, etc.)
 * @param string $filename  The name of the file to size
 * @param int $precision  The number of decimal places to show (default: 1)
 * @return string|bool  A string with the size of the file or false on error
 * @author Sunny Walker <www.miraclesalad.com>
 */
function getFileSize($filename, $precision=1) {
    $return = false;
    if (file_exists($filename)) {
        $fsize = filesize($filename);
        if ($fsize >= pow(2, 40)) $return = (number_format($fsize / pow(2, 40), $precision)).' TB';
        if ($fsize >= pow(2, 30)) $return = (number_format($fsize / pow(2, 30), $precision)).' GB';
        if ($fsize >= pow(2, 20)) $return = (number_format($fsize / pow(2, 20), $precision)).' MB';
        elseif ($fsize >= 1024) $return = (number_format($fsize / 1024, $precision)).' KB';
        else $return = $fsize.' B';
    }
    return $return;
} //getFileSize()
?>