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<?php $a = ['foo' => 'bar', 'baz' => 'bam']; $b = ['foo' => null, 'baz' => null, 'blamo' => null]; var_dump(array_intersect_key($a, $b));
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["foo"]=> string(3) "bar" ["baz"]=> string(3) "bam" }

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