&与&&的区别在哪

Question

&与&&的区别在哪，通俗怎么讲

Answer 1

What is the difference between & and && - PHP Chinese website Q&A - What is the difference between & and && - PHP Chinese website Q&A

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Answer 2

&是位运算符。&&是布尔逻辑运算符。
在运行上，&两边的条件都要判断（不管前面的是ture还是false），而&&先判断前面的，若为false，则后面的不再判断。