MarkDown

markDown.php

<?

function markDown($str){

    //Tag like markdown, ordered by precedence.
    //This is the only thing you really need to configure.
    //It's a regular expression (without delimiters) as the key and the desired output as the value.
    $markdownSet = array(

        "\_\*(.*)\*_" => " <b><i>$2</i></b> ",
        "\*_(.*)_\*" => " <b><i>$2</i></b> ",

        "_(.*)_" => " <i>$2</i> ",
        "\*(.*)\*" => " <b>$2</b> ",
        "\#\#\#(.*)\#\#\#" => " <h3>$2</h3> ",
        "\#\#(.*)\#\#" => " <h2>$2</h2> ",
        "\#(.*)\#" => " <h1>$2</h1> "
    );




    //Strip out the HTML tags, replace them with text
    $str = preg_replace('/</','&lt;',$str);
    $str = preg_replace('/>/','&gt;',$str);
    //Just to make sure they're all gone.
    $str = strip_tags($str);

    foreach($markdownSet as $match => $result){
        $str = preg_replace("/([[:space:]]|\n|^)".$match."([[:space:]]|\n|$)/U","$1".$result."$3",$str);

    }
    //Make links into links
    $str = preg_replace("/http([s]?):\/\/([^\ \)\n$]*)/i","<a href='\\0' rel='nofollow'>\\0</a>",$str);
    //Make Newlines into breaks
    $str = nl2br($str);

    return $str;
}
?>