相关疑难解决方法(0)

What is this?

This is a collection of questions that come up every now and then about syntax in PHP. This is also a Community Wiki, so everyone is invited to participate in maintaining this list.

Why is this?

It used to be hard to find questions about operators and other syntax tokens.¹
The main idea is to have links to existing questions on Stack Overflow, so it's easier for us to reference them, not to copy over content from …

在PHP中检查不相等(没有检查类型),你可以这样做:

if( A != B ) {
    DO SOMETHING;
}

但你也可以这样做,结果相同:

if( A <> B ) {
    DO SOMETHING;
}

有什么区别吗？

使用!=过度<>是以任何方式,形状或形式改变评估？

以下代码有什么作用？PHP手册中某些内容的链接也很不错.

if ($_SERVER['SERVER_PORT'] <> 443) {
    doSomething();
}