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<?php function myfunction($a,$b) { if ($a===$b) { return 0; } return ($a>$b)?1:-1; } $a1=array("a"=>"red","b"=>"green","c"=>"blue"); $a2=array("a"=>"red","b"=>"blue","c"=>"green"); $result=array_uintersect_assoc($a1,$a2,"myfunction"); print_r($result); ?>