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run code in 200+ php & hhvm versions
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<?php $a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("e"=>"red","f"=>"green","g"=>"blue"); $result=array_diff($a1,$a2); print_r($result);
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.21.0, 7.0.0 - 7.1.8
Array ( [d] => yellow )