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

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