<?php
/**
 * Created by PhpStorm.
 * User: Exerosis
 * Date: 7/1/2015
 * Time: 1:25 PM
 */

$array = array('1','2','3','4','5');

foreach ($array as $key => $moo)
{
    if ($moo == '2')
        unset ($array[$key]);
}

print_r($array);