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There could be several reasons why the open_basedir restriction is not functioning as expected. Here are some possible causes:

1. Incorrect configuration: Double-check that the open_basedir restriction is correctly configured in the PHP configuration file, and that the path or paths specified are correct and secure.

2. Web server misconfiguration: The openbasedir restriction may not be working properly due to a misconfiguration of the web server itself. Make sure that the web server is configured to properly interpret the openbasedir restriction settings and that it is not overridden by other directives.

3. Permissions issues: The openbasedir restriction may not be enforced if file and directory permissions are not set correctly. Ensure that the files and directories specified in the openbasedir restriction have the appropriate permissions.

4. Bug in PHP or the web server: In some cases, the open_basedir restriction may not work due to bugs in the PHP or web server software. Check online forums and documentation to see if others have experienced similar issues and if any patches or workarounds are available.

5. Root access: Finally, if the server is running as the root user, open_basedir restrictions may not be enforced. It is not recommended to run PHP scripts as the root user for security reasons.