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run code in 150+ php & hhvm versions
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<?php $array = Array( '0' => Array('id' => '5', 'class' => 'A'), '1' => Array('id' => '53', 'class' => 'B'), '2' => Array('id' => '2', 'class' => 'C'), ); foreach ($array as $key => $values) { $array[$key]['description'] = 'dadadadad'; if ($values['class'] == 'B') { $array = array_intersect_key($array, array_flip(Array($key))); } } var_dump($array);
Output for 5.1.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { [1]=> array(3) { ["id"]=> string(2) "53" ["class"]=> string(1) "B" ["description"]=> string(9) "dadadadad" } [2]=> array(1) { ["description"]=> string(9) "dadadadad" } }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.0.5
Fatal error: Call to undefined function array_intersect_key() in /in/v1ddP on line 12
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_intersect_key() in /in/v1ddP on line 12
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_intersect_key() in /in/v1ddP on line 12
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_intersect_key() in /in/v1ddP on line 12