Home Backend Development PHP Problem How to set environment variables in php (two methods)

How to set environment variables in php (two methods)

Apr 11, 2023 am 10:41 AM

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
?>
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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
?>
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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.

The above is the detailed content of How to set environment variables in php (two methods). For more information, please follow other related articles on the PHP Chinese website!

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