Sanitize multi dimensional PHP arrays

sanitize-with-breakpoint.php

<?php

// Only the first parameter is necessary. The other two are there because of the recursion :)
function sanitizeArray (array $array, array &$output = [], $breakpoint = 0) {

	foreach($array as $key => $val){

		if(++$breakpoint > 1000){

			return false;

		}

		if(is_array($val)){

			$output[htmlspecialchars($key)] = sanitizeArray($val, $output, $breakpoint);

		}else{

			$output[htmlspecialchars($key)] = htmlspecialchars($val);

		}

	}

	return $output;

}

sanitize.php

<?php

// Only the first parameter is necessary. The other one is there because of the recursion :)
function sanitizeArray (array $array, array &$output = []) {

	foreach($array as $key => $val){

		if(is_array($val)){

			$output[htmlspecialchars($key)] = sanitizeArray($val, $output);

		}else{

			$output[htmlspecialchars($key)] = htmlspecialchars($val);

		}

	}

	return $output;

}