recursive max

Simpler recursive max

<?php

// Recursively determine the max
// Does not handle badly formed input
// Not yet optimized for performance
function my_max( $data ) {
	if(is_int($data)){
		return $data; // end of the line, just return the int
	}
    $max = null;
    foreach($data as $elem){
    	$new_max = my_max($elem); // If it's an integer, it'll just be returned!
        $max = $new_max > $max? $new_max : $max;
    }    
    return $max;
}

echo my_max( array( 1, 2, 3, 4, 5 ) ); // 5
echo my_max( array( 1, 2, array( 5, 6 ), 3, 4 )); // 6
echo my_max( array( 1, 2, array( 5, 6, 7, 89, 213, -4), 3, 4, 55, 87, 44 )); // 213
echo my_max( array( -1, -2, array( -5, -6, -7, -89, -213, -4), -3, -4, -55, -87, -44, 0 )); // 0