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<?php $a = 1234455; $b = 54456; $a = str_split($a); $b = str_split($b); $matching = array_intersect($a, $b); Var_dump($matching);
Output for 7.1.0 - 7.1.25, 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
array(4) { [3]=> string(1) "4" [4]=> string(1) "4" [5]=> string(1) "5" [6]=> string(1) "5" }

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