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<?php $a = [1,2,3,4,5,6,7,8,9]; $b = [2,5,7,11,21]; var_dump( array_intersect($a, $b) );
Output for git.master_jit, git.master
array(3) { [1]=> int(2) [4]=> int(5) [6]=> int(7) }

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