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<?php $a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("e"=>"red","f"=>"green","g"=>"blue"); var_dump(array_intersect(array_keys($a1), array_keys($a2)));
Output for git.master, git.master_jit, rfc.property-hooks
array(0) { }

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