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<?php $a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("e"=>"red","f"=>"green","g"=>"blue"); $result=array_intersect($a1,$a2); print_r($result);
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2 - 3.17.3, 7.0.0 - 7.2.0
Array ( [a] => red [b] => green [c] => blue )
Output for hhvm-3.12.14

Process exited with code 137.