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run code in 150+ php & hhvm versions
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<?php $accessible = array('title', 'description', 'category_ids'); $accessible = array_fill_keys($accessible, 0); $attributes = array('id' => 1, 'title' => 'Pippo', 'description' => 'Lollo', 'permalink' => 'ciao', 'author_id' => 3, 'category_ids' => array('ciao', 'come', 'va'), 'pippo' => null); print_r(array_intersect_key($attributes, $accessible)); print_r(array_diff_key($attributes, $accessible));
Output for 5.2.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [title] => Pippo [description] => Lollo [category_ids] => Array ( [0] => ciao [1] => come [2] => va ) ) Array ( [id] => 1 [permalink] => ciao [author_id] => 3 [pippo] => )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function array_fill_keys() in /in/mktt2 on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_fill_keys() in /in/mktt2 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_fill_keys() in /in/mktt2 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_fill_keys() in /in/mktt2 on line 3