<?php
$accessible = array('title', 'description', 'category_ids');
$attributes = array('id' => 1, 'title' => 'Pippo', 'description' => 'Lollo', 'permalink' => 'ciao', 'author_id' => 3, 'category_ids' => array('ciao', 'come', 'va'), 'pippo' => null);
print_r(array_diff_assoc($attributes, $accessible));
// print_r(array_diff($attributes, $accessible));
preferences:
38.52 ms | 402 KiB | 5 Q