"; var_dump($a===$b);//输出：bool(false) echo "
"; var_dump($a!=$b);//输出：bool(false) echo "
"; var_dump($a!==$b);//输出：bool(true) echo "
"; var_dump($a<=$b);//输出：bool(true) echo "
"; var_dump($a>=$b);//输出：bool(true) echo "
"; ?>