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<?php $foo = ['foo', 'bar', 'red']; $bar = ['foo' => 'foo', 'bar' => 'bar', 'green' => 'green']; var_dump(array_intersect_key(array_flip($foo), $bar));
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["foo"]=> int(0) ["bar"]=> int(1) }

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