<?php

    // Add default plugins filters    
    addFilter('content', 'evalPHP');   

    
    /**
     * Evaluate a string as PHP code
     * @param string $str String with PHP code.
     * @return mixed
     */
    function evalPHP($str) {
        return preg_replace_callback('/\[php\](.*?)\[\/php\]/ms','obEval',$str);
    }