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"; var_dump($x === $y); // returns false because types are not equal echo "
"; var_dump($x != $y); // returns false because values are equal echo "
"; var_dump($x !== $y); // returns true because types are not equal echo "
"; $a=50; $b=90; var_dump($a > $b); echo "
"; var_dump($a < $b); ?>
运行结果