gistfile1.php

	<?php
	
	/**
	 * Base version of the method
	 * @see http://www.php.net/manual/de/function.vsprintf.php#110666
	 * 
	 * Like vsprintf, but accepts $args keys instead of order index.
	 * Both numeric and strings matching /[a-zA-Z0-9_-]+/ are allowed.
	 *
	 * @example: vskprintf('y = %y$d, x = %x$1.1f, key = %key$s', array('x' => 1, 'y' => 2, 'key' => 'MyKey'))
	 * Result:  'y = 2, x = 1.0'
	 *
	 * '%s' without argument name works fine too. Everything vsprintf() can do
	 * is supported.
	 *
	 * @author Josef Kufner <jkufner(at)gmail.com>
	 * @author Oskar Stark <oskar.stark@exozet.com>
	 */
	private function vksprintf($str, array $args)
	{
		if(empty($args)) {
			return $str;
		}

		$map = array_flip(array_keys($args));

		$new_str = preg_replace_callback('/(^|[^%])%([a-zA-Z0-9_-]+)\$/', function($m) use ($map) {
			if(isset($map[$m[2]])) {
				return $m[1] . '%' . ($map[$m[2]] + 1) . '$';
			} else {
				/*
				 * HACK!
				 * vsprintf all time removes '% and the following character'
				 * 
				 * so we add 6 x # to the string.
				 * vsprintf will remove '%#' and later we remove the rest #
				 */
				return $m[1] . '%######' . $m[2][0] . '%' . $m[2] . '$';
			}
		},
		$str);

		$replaced_str = vsprintf($new_str, $args);

		return str_replace('#####', '%', $replaced_str);
	}