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<?php
    $a1=array("a"=>array("red"),"b"=>array("green","blue"));
    $a2=array("a"=>array("yellow"),"b"=>array("black"));
    $a3=array("a"=>array("orange"),"b"=>array("burgundy"));
print_r(array_replace_recursive($a1,$a2,$a3));
?>
 
 
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