How to set environment variables in php (two methods)

In PHP programming, it is often necessary to set environment variables so that the program can execute smoothly. Environment variables are a set of key-value pairs defined in the operating system to store important information and system parameters.

PHP provides a variety of methods for setting environment variables. This article will introduce you to two of the most commonly used methods.

Method 1: Use the putenv() function to set environment variables

putenv() is a built-in function in PHP for setting environment variables. By specifying key-value pairs, the PHP program can be run Get the environment variable value set during the process. The parameter of this function is a string type in the format of "key=value".

The following is an example that demonstrates how to use the putenv() function to set environment variables in PHP:

<?php
putenv("ENV_VAR=test"); // 设置环境变量
echo getenv("ENV_VAR") . "\n"; // 获取环境变量值
?>

Run the above code, the program will output "test", which is the set environment variable.

Method 2: Use the $_ENV array to set environment variables

$_ENV is a reserved array in PHP, used to store environment variables. You can access and set environment variable values ​​through this array. This array was introduced in PHP5.3.0 version.

The following is an example that demonstrates how to set environment variables in PHP using the $_ENV array:

<?php
$_ENV["ENV_VAR"] = "test"; // 设置环境变量
echo getenv("ENV_VAR") . "\n"; // 获取环境变量值
?>

Similarly, the program will output "test", which is the set environment variable value .

To sum up, PHP provides a variety of methods to set environment variables. You can choose the most suitable method according to your needs. After setting the environment variables, the program can run normally, thereby achieving a more efficient and stable development experience.

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