PHP - 和/或关键字

PHP - and / or keywords(PHP - 和/或关键字)

问题描述

&&是否与and"相同，||是否与PHP中的or"相同?

Is && the same as "and", and is || the same as "or" in PHP?

我做了一些测试，看起来它们的行为是一样的.有什么不同吗?

I've done a few tests, and it seems they behave the same. Are there any differences?

如果没有，是否有任何其他 PHP 标志具有等价词，您认为它是否使代码更易于阅读?

If not, are there any other PHP signs that have word equivalents and do you think it makes the code easier to read?

推荐答案

and 和 or 的优先级低于 && 和 ||.更准确地说，&& 和 || 的优先级高于赋值运算符 ( = ) 而 and而或则更低.

and and or have higher lower precedence than && and ||. To be more exact && and || have higher precedence than assignment operator ( = ) while and and or have lower.

http://www.php.net/manual/en/language.operators.precedence.php

通常它不会产生影响，但在某些情况下，不知道这种差异可能会导致一些意外行为.在此处查看示例:

Usually it doesn't make a difference, but there are cases when not knowing about this difference can cause some unexpected behaviour. See examples here:

http://php.net/manual/en/language.operators.逻辑.php

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