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逻辑运算
逻辑运算常用于条件语句
如果$a = 1;$b = 2;以下哪个语句返回是TRUE
($a > 1 || $b >3)
($a > 1 && $b < 1)
($a < 2 && $b > 1)
($a > 0 || $b<5)
1
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