Detailed explanation of how to set system variables in php

How to set system variables in php: first turn on the computer; then find "Advanced System Settings" in the control panel; then click "Environment Variables" in "System Properties"; finally add the variable value and save it .

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When I see this title, I have two questions: whether to set system environment variables for php.exe, or to set environment variables for programming languages ​​that can be called directly. Some people may be confused when talking about this, because What we often see is the first one, which is equivalent to setting a shortcut key for a certain command without having to enter the directory where the application is installed and then type the command. For example:

1. When the php.exe global environment variable is not added, we need to run php in the following directory:

D:\phpStudy\php\php-5.6.27-nts\

Note: This is my php.exe installation directory, yours may be different from mine, that doesn't matter.

For example,

View php version information:

php -v

View php expansion module:

php -m

This is a very troublesome thing , I want to use the php command anywhere, then you should add php.exe to the global environment variable.

This is very simple. Most programs set global variables in the same way. Find the computer, right-click, and open the system control system panel. There is an advanced system setting on the left, click in and you can see it. Picture steps shown below:

First step:

Second step:

Step Three:

Step Four:

Just fill in the installation path of your software , the system will automatically recognize the executable files you are facing, .exe, .bat, .phar and other executable files, and then you can directly use php commands anywhere! Isn’t it great!

2. Set environment variables for php’s

getenv() and $_ENV() functions:

I’m not done yet, I need Setting environment variables for PHP is the kind of environment variables that can be obtained directly using

getenv() and $_ENV()! Then you need to read here. There are no online tutorials on this yet, and I figured it out myself. Proceed in three steps:

The first step: modify the php.ini file, the following code:

variables_order = "EGPCS"

The default value is 'GPCS', which represents:

GET, POST, COOKIE, ENV and SERVER, E stands for ENVIRONMENT, which means environment variables!

Second step:

Follow the previous steps, open the environment variable setting window:

Set the environment variables you need here, such as database account password, etc. I've made a mosaic here, it's a must.

Step 3: Restart the computer and it will take effect! Setting global variables for php.exe does not require restarting the computer.

After restarting, you can use it directly in the program. For example, in my php program. You can directly:

echo getenv('DB_HOST_NAME)
//或者 echo $_ENV('DB_HOST_NAME)

Is that enough! Try it now!

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