案例：PHP案例     状态：不可编辑再运行    进入竖版
 运行结果　
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<?php
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$x = array("a" => "red", "b" => "green");
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$y = array("c" => "blue", "d" => "yellow");
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$z = $x + $y; // $x 与 $y 的联合
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var_dump($z);
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echo "\n";
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var_dump($x == $y);
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echo "\n";
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var_dump($x === $y);
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echo "\n";
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var_dump($x != $y);
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echo "\n";
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var_dump($x <> $y);
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echo "\n";
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var_dump($x !== $y);
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?>