Tims-Chat/file/lib/util/ChatUtil.class.php

<?php
namespace wcf\util;

/**
 * Chat utilities
 * 
 * @author	Tim Düsterhus
 * @copyright	2010-2011 Tim Düsterhus
 * @license	Creative Commons Attribution-NonCommercial-ShareAlike <http://creativecommons.org/licenses/by-nc-sa/3.0/legalcode>
 * @package	timwolla.wcf.chat
 * @subpackage	util
 */
class ChatUtil {
	/**
	 * Matches a time-interval with modifiers.
	 * Each part may be optionally separated by a comma
	 * 
	 * @see	\wcf\util\ChatUtil::timeModifier()
	 */
	const TIME_MODIFIER_REGEX = '((?:[0-9]+[h|d|w|m|y|H|D|W|M|Y]?,?)+)';
	
	/**
	 * Creates a gradient out of two colors represented by an integer.
	 * The first byte is red, the second byte is green, the third one is blue.
	 * The numbers can be easily expressed in hexadecimal notation: 0xFF0000 being red.
	 *
	 * @param	string	$string
	 * @param	integer	$start
	 * @param	integer	$end
	 * @returen	string
	 */
	public static function gradient($string, $start, $end) {
		$string = str_split($string);
		$r = (int) ((($start & 0xFF0000) - ($end & 0xFF0000)) / (count($string) - 1));
		$g = (int) ((($start & 0x00FF00) - ($end & 0x00FF00)) / (count($string) - 1));
		$b = (int) ((($start & 0x0000FF) - ($end & 0x0000FF)) / (count($string) - 1));
		
		$result = '';
		for ($i = 0, $max = count($string); $i < $max; $i++) {
			$result .= '<span style="color:rgb('.(($start & 0xFF0000) - $i * $r).','.(($start & 0x00FF00) - $i * $g).','.(($start & 0x0000FF) - $i * $b).')">'.$string[$i].'</span>'; 
		}
		
		return $result;
	}
	
	/**
	 * Creates an interval out of a string with modifiers.
	 * Modifiers may be mixed. Valid modifiers are: _s_econd, _h_our, _d_ay, _w_week, _m_onth, _y_ear
	 * '2' -> 2 minutes
	 * '2h' -> 2 hours
	 * '1y12m2w3d12h' -> 1 year, 12 months, 2 weeks, 3 days, 12 hours
	 *
	 * @param 	string	 	$time
	 * @return	integer
	 */
	public static function timeModifier($time) {
		preg_match_all('!([0-9]+[s|h|d|w|m|y]?)!i', $time, $matches);
		$result = 0;
		foreach ($matches[1] as $time) {
			// 60 seconds a minute
			$multiplier = 60;
			$modifier = substr($time, -1);
			
			switch ($modifier) {
				case 'y':
				case 'Y':
					// twelve months a year
					$multiplier *= 12;
				case 'm':
				case 'M':
					// about 4.3 weeks per month
					$multiplier *= 4.34812141;
				case 'w':
				case 'W':
					// seven days a weeks
					$multiplier *= 7;
				case 'd':
				case 'D':
					// 24 hours a day
					$multiplier *= 24;
				case 'h':
				case 'H':
					// 60 minutes an hour
					$multiplier *= 60;
					$time = substr($time, 0, -1);
				break;
				case 's':
				case 'S':
					// 60 seconds per minute
					$multiplier /= 60;
					$time = substr($time, 0, -1);
			}
			
			$result += $time * $multiplier;
		}
		
		return (int) round($result, 0);
	}
}