“和"之间是否有任何区别?和“&&" PHP中的运算符? [英] Is there any difference between "and" and "&&" operators in PHP?

问题描述

我有以下代码，并且认为不需要和，即应使用&&，因为没有什么可分配左部分的?

I have the following code and don't think and is needed, i.e. && should be used, as there is nothing to assign the left part to?

if($_REQUEST['foo'] != 'abc' and $_REQUEST['bar'] == 'def')
{
    echo "all your base";
}

应该是:

if($_REQUEST['foo'] != 'abc' && $_REQUEST['bar'] == 'def')
{
    echo "all your base";
}

推荐答案

在您的情况下，&&和and做相同的事情，但是请看一下

In your case, && and and do the same thing, but take a look at the operator precedence. You can see that && and and are not on the same level, so mixing that could give you unexpected results in some cases - I recommend always using &&, but that's your choice.

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