Home php教程 php手册 php $_ENV的详解 存储一些系统环境变量

php $_ENV的详解 存储一些系统环境变量

Jun 21, 2016 am 08:53 AM
env php quot

php中的$_ENV存储了一些系统的环境变量,因环境不同而值不同.
但有时候$_ENV是空的,可能有以下原因:
在 php.ini中的variables_order值为"GPCS",也就是说系统在定义PHP预定义变量时的顺序是 GET,POST,COOKIES,SERVER,没有定义Environment(E),

你可以修改php.ini文件的variables_order值为你想要的顺序,如:"EGPCS"。这时,$_ENV的值就可以取得了
EGPCS值:(EGPCS是Environment、Get、Post、Cookies、Server的缩写 -- 这是PHP中外部变量来源的全部范围).

你可以用foreach来遍历$_ENV的数据,也可以直接用print_r($_ENV)来打印这个变量,查看他的数据.


$_ENV记载了一些系统环境变量(因为牵扯到实际的操作系统,所以不可能给出$_ENV的完整列表)。

$_ENV为空的可能是原因是:
你的php.ini的variables_order值为"GPCS",也就是说系统在定义PHP预定义变量时的顺序是 GET,POST,COOKIES,SERVER,没有定义Environment(E),你可以修改php.ini文件的 variables_order值为你想要的顺序,如:"EGPCS"。这时,$_ENV的值就可以取得了
EGPCS值(EGPCS是Environment、Get、Post、Cookies、Server的缩写 -- 这是PHP中外部变量来源的全部范围)



Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot Article Tags

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian

CakePHP Date and Time CakePHP Date and Time Sep 10, 2024 pm 05:27 PM

CakePHP Date and Time

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

CakePHP File upload

CakePHP Routing CakePHP Routing Sep 10, 2024 pm 05:25 PM

CakePHP Routing

CakePHP Project Configuration CakePHP Project Configuration Sep 10, 2024 pm 05:25 PM

CakePHP Project Configuration

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

Discuss CakePHP

CakePHP Quick Guide CakePHP Quick Guide Sep 10, 2024 pm 05:27 PM

CakePHP Quick Guide

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

How To Set Up Visual Studio Code (VS Code) for PHP Development

See all articles