Solution to PHP not starting on Ubuntu

The problem of PHP failing to start on Ubuntu is very common. It may be caused by configuration errors, plug-in conflicts, or the service does not start correctly. In order to solve this problem, we need to gradually investigate the possible causes and make corresponding adjustments and repairs according to the specific situation. The following are some solutions and specific code examples for reference:

1. Check the PHP configuration file

First, we need to check whether the PHP configuration file is correct. You can open the PHP configuration file for inspection by using the following command:

sudo nano /etc/php/7.4/apache2/php.ini

Check the configuration items in the file to ensure that there are no syntax errors or illegal values. You can pay special attention to the following configuration items:

• error_reporting: Set the error reporting level. You can try setting error_reporting = E_ALL to display all error messages.
• display_errors: Set whether to display error messages on the page. You can try setting it to display_errors = On.
• extension_dir: Ensure that the path to the PHP extension library is configured correctly.

After checking the configuration file, restart the Apache service:

sudo service apache2 restart

2. Check the Apache configuration file

In addition to the PHP configuration file, You need to check whether the Apache configuration file is correct. You can edit Apache's main configuration file with the following command:

sudo nano /etc/apache2/apache2.conf

Make sure the following modules are enabled:

LoadModule php7_module /usr/lib/apache2/modules/libphp7.4.so
AddHandler application/x-httpd-php .php

After saving the file, restart the Apache service:

sudo service apache2 restart

3. Check the PHP error log

If PHP still cannot start, you can check the PHP error log for more information:

sudo nano /var/log/apache2/error.log

Look for keywords in the log, such as PHP Fatal error or PHP Warning can help locate the problem.

4. Check the PHP module

Sometimes the PHP module may not be loaded correctly. You can check whether it is installed by running the following commandlibapache2-mod-phpModule:

sudo apt-get install libapache2-mod-php

After installation, restart the Apache service:

sudo service apache2 restart

Summary

In general, solve the problem of PHP not working on Ubuntu Startup problems require step-by-step investigation of possible causes, and comprehensive consideration of PHP configuration, Apache configuration, error logs, modules, etc. Through the troubleshooting and adjustment of the above methods, most situations where PHP cannot be started should be able to be solved. If the problem is still not resolved, you can consider seeking more professional technical support.

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