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<!DOCTYPE html> <html> <body> <?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)); ?> </body> </html>