$arr = array('a"aa',array("c'd",array('e"f')));
function changes($arr){
foreach($arr as $k=>$v){
if (is_string($v)){
$arr[$k] = addslashes($v);
}else if (is_array($v)) { //若為數組，則再轉義.
$arr[$k] = changes($v);
}
}
return $arr;
}
print_r(changes($arr));