3v4l.org

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<?php $m = [ 'foo' => 'aaa', 'bar' => 'bbb', 'baz' => 'ccc', ]; $v = 'bbb'; var_dump(in_array($v, $m, true)); $v = 'zzz'; var_dump(in_array($v, $m, true));
Output for 7.1.25 - 7.1.32, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
bool(true) bool(false)

preferences:
45.62 ms | 409 KiB | 5 Q