Sanitizing string for blog

<?php

	// $str = '<p>Test paragraph.</p><!-- Comment --> <a href="#fragment">Other text</a>';
	// echo strip_tags($str , '<p><a>');

	function cube($n)
	{
		if( !is_array($n) )
		{
			return $n . " hehe";
		}

		else
		{
			return 	array_map('cube', $n);
		}
	}

	$a = array(
		0 => array( 1 ,2 ,3 , 4 , 5 ) ,
		1 => array( 10 ,20 ,30 , 40 , 50 ) ,
		2 => array( 100 ,200 ,300 , 400 , 500 )
		);

	$b = array_map('cube', $a);

	var_dump($b );

 ?>