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<?php $a = ['a', 'b', 'c', 'd']; $b = ['b','x']; var_dump(in_array($b, $a)); var_dump(array_intersect($a,$b));
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
bool(false) array(1) { [1]=> string(1) "b" }

preferences:
218.41 ms | 403 KiB | 287 Q