What are common reasons for PHP code not being executed or displayed properly in a web page?

Common reasons for PHP code not being executed or displayed properly in a web page include server misconfiguration, incorrect file extensions, syntax errors in the PHP code, or PHP not being enabled on the server. To solve this issue, ensure that your server is properly configured to run PHP, check for any syntax errors in your PHP code, make sure your file has a .php extension, and verify that PHP is enabled on your server.

<?php
// Ensure PHP is enabled on the server and file has .php extension
// Check for any syntax errors in your PHP code
// Verify server configuration to run PHP
?>