Why Does My PHP exec() Function Fail to Run Python Scripts, Even with Proper Permissions?

Running a Python Script from PHP

When attempting to execute a Python script from PHP using the exec() function, some users encounter issues with PHP failing to produce any output. Despite setting error reporting to E_ALL and enabling display_errors, the script remains unresponsive.

To troubleshoot this problem, various solutions have been tested, including:

• Using python2, /usr/bin/python2, and python2.7 instead of /usr/bin/python2.7
• Employing both absolute and relative paths
• Implementing exec, shell_exec, and system commands

However, the exec() function works when used with the command 'echo TEST,' while the shutdown command remains inoperative. Additionally, PHP has the necessary permissions to access and execute the Python script.

Upon further investigation, it has been discovered that PHP's web server is often not running as root. To resolve this, log in as your web server's user or an account with similar permissions and attempt to execute the commands manually.

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