<?php

function arrRecursiveDiff( $arr1, $arr2 ) {
	$aReturn = array();

	foreach ( $arr1 as $mKey => $mValue ) {
		if ( array_key_exists( $mKey, $arr2 ) ) {
			if ( is_array( $mValue ) ) {
				$aRecursiveDiff = arrRecursiveDiff( $mValue, $arr2[$mKey] );
				if ( count( $aRecursiveDiff ) ) {
					$aReturn[$mKey] = $aRecursiveDiff;
				}
			} else {
				if ( $mValue != $arr2[$mKey] ) {
					$aReturn[$mKey] = $mValue;
				}
			}
		} else {
			$aReturn[$mKey] = $mValue;
		}
	}
	return $aReturn;
}