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"red", "b" => "green"); $y = array("c" => "blue", "d" => "yellow"); $z = $x + $y; // union of $x and $y var_dump($z); echo "
"; var_dump($x == $y); echo "
"; var_dump($x === $y); echo "
"; var_dump($x != $y); echo "
"; var_dump($x <> $y); echo "
"; var_dump($x !== $y); ?>
运行结果