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<?php $obj = ['key'=>['key'=>['key'=>[]]]]; function rec($recObj, $i = 0) { foreach($recObj as $key) { if(array_key_exists("key", $recObj)) { echo "fires".PHP_EOL; $i ++; $i = rec($recObj['key'], $i); } } return $i; } echo rec($obj);
Output for 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
fires fires fires 3

preferences:
46.84 ms | 835 KiB | 4 Q