How to use preg_replace_callback?

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Use the following:

$out = preg_replace_callback(
    "(\[otsection\](.*?)\[/otsection\])is",
    function($m) {
        static $id = 0;
        $id++;
        return "<div class=\"otsection\" id=\"ots".$id."\">".$m[1]."</div>";
    },
    $in);

In particular, note that I used a static variable. This variable persists across calls to the function, meaning that it will be incremented every time the function is called, which happens for each match.

Also, note that I prepended ots to the ID. Element IDs should not start with numbers.

For PHP before 5.3:

$out = preg_replace_callback(
    "(\[otsection\](.*?)\[/otsection\])is",
    create_function('$m','
        static $id = 0;
        $id++;
        return "<div class=\"otsection\" id=\"ots".$id."\">".$m[1]."</div>";
    '),
    $in);

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