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$b)?1:-1; } $a1=array("a"=>"red","b"=>"green","c"=>"blue"); $a2=array("a"=>"black","b"=>"yellow","d"=>"brown"); $a3=array("e"=>"purple","f"=>"white","a"=>"gold"); $result=array_diff_ukey($a1,$a2,$a3,"myfunction"); print_r($result); ?>