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centos - How to get PHP to be able to read system environment variables

Hey everyone,

I'm currently working on a CentOS server and I'm facing an issue with PHP not being able to read system environment variables. I have a PHP script that relies on some environment variables, but for some reason, it's not able to access them.

I've tried setting the environment variables in my .bashrc file and even restarted the server to make sure they are properly loaded. However, when I try to access them using `getenv()` or `$_SERVER`, the variables are not available.

I've also done some research and found that there is a `variables_order` directive in the php.ini file that determines the order in which PHP retrieves environment variables. I made sure that `E` (environment variables) is included in the order, but it still doesn't work.

Is there something else I need to configure or check in order to make PHP recognize system environment variables? I would greatly appreciate any help or suggestions to troubleshoot this issue.

Thanks in advance!

All Replies


I had a similar issue once, and after some troubleshooting, I found a solution that worked for me. You might want to check if you have the PHP module for environment variables installed on your server.

You can try installing the module by running `sudo yum install php-environment` in your terminal. Once installed, restart the Apache or PHP-FPM service using `sudo systemctl restart httpd` or `sudo systemctl restart php-fpm`, respectively.

After that, you can test if PHP can read the system environment variables by creating a simple test script. Something like this:

echo getenv('YOUR_ENV_VARIABLE_NAME');

Replace `'YOUR_ENV_VARIABLE_NAME'` with the name of the specific environment variable you want to retrieve. Then, access the script in your browser and see if it displays the value.

Hopefully, this helps you resolve the issue. Let me know if you have any further questions!


I encountered a similar problem with PHP and system environment variables on CentOS. After some exploration, I found a different approach that resolved the issue for me. You might want to check the Apache configuration file, specifically the `httpd.conf` or `apache2.conf` file based on your setup.

Within the configuration file, look for the `PassEnv` directive. This directive allows you to pass specific system environment variables to the Apache environment, making them accessible to PHP. Uncomment the line or add it if it doesn't exist, and specify the names of the environment variables you want to use, separated by spaces.

For example:


Save the configuration file and restart Apache using `sudo systemctl restart httpd` or `sudo systemctl restart apache2` depending on your server configuration.

Now, you can try accessing the environment variables from your PHP script using `getenv()` or `$_SERVER`, and they should be available.

Give this method a try and see if it resolves your issue. Let me know if you need any further assistance or have any other questions!


I also encountered a similar problem with PHP and system environment variables on CentOS, and I found a different solution that might help you out. One thing you can try is modifying the PHP-FPM configuration file.

Open the `php-fpm.conf` file, typically located in `/etc/php-fpm.d/` directory. Look for the `env` directive, which determines the environment variables that are passed to PHP-FPM. By default, it includes a predefined list of variables. However, if your desired environment variables are not present there, you can manually add them.

For example:


Make sure to replace `YOUR_ENV_VARIABLE_NAME` with the actual name of the environment variable you want to access. Save the changes and restart PHP-FPM using `sudo systemctl restart php-fpm`.

After making these modifications, try accessing the system environment variable from your PHP script using `getenv()` or `$_SERVER`. Hopefully, the variable should now be available and readable.

Give this approach a shot and let me know if it resolves the issue for you. If you have any further queries or need additional assistance, feel free to ask!

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