array walk?

[Juan Ignacio Borda <webmaster@xxxxxxxxxxxxxxxxxxxx>]

this code doesn't work on my PHP Version 5.2.1 (i'm trying to protect a 
stie from XSS)

<?php
$a=Array();
$a[]='<i>como</i>';
$a[]=Array('<b>hola</b>','hello');
array_walk_recursive($a,'strip_tags');
echo "<pre>";
var_dump($a);
echo "</pre>";
?>
it outputs:

<pre>array(2) {
[0]=>
string(11) "<i>como</i>"
[1]=>
&array(2) {
  [0]=>
  string(11) "<b>hola</b>"
  [1]=>
  string(5) "hello"
}
}
</pre>

any clues?

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