Alay Detector 2

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class tes extends CI_Controller {

	var $replace = array(
		'r' => 12,
		'R' => 12,
		's' => 5,
		'S' => 5,
		'a' => 4,
		'A' => 4,
		'e' => 3,
		'E' => 3,
		'i' => 1,
		'I' => 1,
		'o' => 0,
		'O' => 0,
	);

	public function index(){}

	public function alay($str)
	{
		$str = urldecode($str);
		$arr = explode(' ', $str);

		foreach ($arr as $i=>$a)
		{
			if (!is_numeric($a))
			{
				$arr[$i] = str_replace(array_keys($this->replace), $this->replace, $arr[$i]);
			}
		}
		return implode(' ', $arr);
	}

	public function dealay($str)
	{
		$str = urldecode($str);
		$arr = explode(' ', $str);

		foreach ($arr as $i=>$a)
		{
			if (!is_numeric($a) && strtoupper($a) != $a )
			{
				$arr[$i] = str_replace($this->replace, array_keys($this->replace), $arr[$i]);
			}
		}
		return implode(' ', $arr);
	}

	public function auto($str)
	{
		$str = urldecode($str);
		$is_alay = false;

		$arr = explode(' ', $str);
		foreach ($arr as $a)
		{
			if (preg_match('/[A-Za-z]+[0-9]+/', $a) && strlen($a) > 2) $is_alay = true;
		}
		$str = implode(' ', $arr);
		if ($is_alay) $str = $this->dealay($str);
		else $str = $this->alay($str);

		echo $str;
	}

}