<?php //echo acos(3); var_dump(acos(3) === acos(3)); var_dump(acos(3) == acos(3)); // Note that NAN is a float and becomes 0 var_dump($array = [acos(3) => 3]); var_dump(isset($array[acos(3)])); // Idem pour INF, which is infinity var_dump($array = [INF => 3]); var_dump(isset($array[INF]));
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