Compare variables PHP(比较变量 PHP)

本文介绍了比较变量 PHP的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

如何比较两个变量字符串，会不会是这样:

How can I compare two variable strings, would it be like so:

$myVar = "hello";
if ($myVar == "hello") {
//do code
}

然后检查 url 中是否存在 $_GET[] 变量会是这样吗?

And to check to see if a $_GET[] variable is present in the url would it be like this"

$myVars = $_GET['param'];
if ($myVars == NULL) {
//do code
}

推荐答案

$myVar = "hello";
if ($myVar == "hello") {
    //do code
}

$myVar = $_GET['param'];
if (isset($myVar)) {
    //IF THE VARIABLE IS SET do code
}


if (!isset($myVar)) {
    //IF THE VARIABLE IS NOT SET do code
}

供您参考，第一次启动 PHP 时让我跺了好几天的东西:

For your reference, something that stomped me for days when first starting PHP:

$_GET["var1"] // these are set from the header location so www.site.com/?var1=something
$_POST["var1"] //these are sent by forms from other pages to the php page

这篇关于比较变量 PHP的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！