Show console progress bar

progress-fn.php

<?php
function progress($current, $total = null, $extra = null)
{
	static $width = null;
	static $startTime = null;

	if ( $width === null ) {
		if ( strtoupper(substr(PHP_OS, 0, 3)) === 'WIN' )
			$width = 80;
		else
			$width = intval(`tput cols`);
	}

	if ( $current == 'create' ) {
		$startTime = microtime(true);

		echo "\x1b[?25l\x1b[0K";
	}

	elseif ( $current == 'destroy' ) {
		$startTime = null;
		echo "\x1b[?25h\x1b[0K";
	}

	else {
		if ( empty($total) ) {
			$remain = $current % $width;
			echo str_repeat($empty, $remain) . $filled . str_repeat($empty, $width - $remain - 1);
		}
		else {
			$deltaTime = microtime(true) - $startTime;
			$rate = $deltaTime > 0 ? $current / $deltaTime : PHP_INT_MAX;
			$remain = ($total - $current) / $rate;
			$quocient = $current / $total;
			$progress = intval($quocient * $width);

			if ( empty($extra) )
				$extra = '';

			$extra = ' ' . $extra;
			$string = $current . ' / ' . $total . ' (restam ' . interval($remain) . ') ';

			$string = str_pad($extra, $width - strlen($string), ' ', STR_PAD_RIGHT) . $string;
			
			echo "\x1b[1;37;46m",
			     mb_substr($string, 0, $progress),
			     "\x1b[40m",
			     mb_substr($string, $progress),
			     "\x1b[0m",
			     str_repeat("\x8", $width);
		}

		echo str_repeat("\010", $width);
	}
}