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A brief summary of commonly used magic constants and superglobal variables in PHP

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Release: 2023-04-03 21:46:01
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This article brings you a brief summary of the commonly used magic constants and superglobal variables in PHP. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

1. Commonly used magic constants

//获取当前文件所在的目录,如:D:\web
echo __DIR__;
//获取当前文件的绝对路径,目录+文件名,如:D:\web\index.php
echo __FILE__;
//当前运行脚本的类名称
echo __CLASS__;
//当前运行脚本的函数名称
echo __FUNCTION__;
//当前运行脚本的方法名称
echo __METHOD__;
/*注:非类方法体内,__FUNCTION__等同于__METHOD__;
     类方法体中__METHOD__会包含类名称,如:ClassName::MethodName*/
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2. Commonly used super global variables

//$_COOKIE由HTTP传递给脚本的变量数组,记录在客户端
print_r($_COOKIE);
$_COOKIE['var_name'] = 'cookie';    //赋值
echo $_COOKIE['var_name'];        //取值
//$_SESSION存储在服务器端的变量数组,需要依赖$_COOKIE
session_start();//开启session,需写在在文件开头
print_r($_SESSION);
$_SESSION['var_name'] = 'session';    //赋值
echo $_SESSION['var_name'];        //取值
//$_GET获取URL携带的参数
echo $_GET['param'];
//$_POST获取HTTP使用post方式传递的参数
echo $_POST['param'];
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Related recommendations:

PHP global variables and super global variables Difference analysis, the difference between php global variables

The difference between super global variables $GLOBALS and global in PHP              

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