PHP中的语法是什么？ [英] What is this syntax in PHP?

问题描述

我正在修改脚本以更好地适应我的需要，我在代码中遇到了这一行：

I'm working on modifying a script to better suit my needs, and I came across this line in the code:

return isset($_COOKIE[$parameter_name]) ? $_COOKIE[$parameter_name] : "";

我知道函数本身本质上是一个cookie getter方法，但我不知道什么该语法（即？和：）意味着。

I know that the function itself is essentially a cookie getter method, but I'm not quite sure what that syntax (i.e. the "?" and ":") means. I apologize if this is a really dumb question, but could someone explain it to me?

推荐答案

这是一个三元操作，基本上是一个更紧凑的写if / then / else的方法。

It's a ternary operation and is basically a more compact way of writing an if/then/else.

所以在你的代码示例中，它被使用，而不必写：

So in your code sample it's being used instead of having to write:

if (isset($_COOKIE[$parameter_name])) {
    return $_COOKIE[$parameter_name];
} else {
    return "";
}

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