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<?php function arrayReplace($a1, $a2) { foreach($a2 as $k=>$v) { $a1[$k]=$v; } return $a1; } $a1 = array(0 => 1, 1 => "b", "b" => "carrot"); $a2 = array(1 => "c", 2 => "d", "b" => "apple"); print_r(arrayReplace($a1, $a2));

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