format_filesize

gistfile1.php

<?php

if ( ! function_exists('format_filesize'))
{
	/**
	 * Formats a filesize in a human readable way.
	 *
	 * @param int   $size
	 * @param array $sizes
	 * @return string
	 */
	function format_filesize($size, $sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'])
	{
		// If you send 0 to the formula below, it will throw a division by zero error.
		if ($size === 0) return '0 ' . $sizes[0];

		return (round($size / pow(1024, ($index = floor(log($size, 1024)))), 2).' '.$sizes[$index]);
	}
}