What are common reasons for PHP scripts working in the shell but not in the browser?

Common reasons for PHP scripts working in the shell but not in the browser include differences in configuration settings, such as PHP version, error reporting levels, or disabled functions in the web server environment. To solve this issue, ensure that your PHP script is compatible with the PHP version running on the web server, check for any syntax errors or warnings that may be suppressed in the shell environment, and review the server's configuration settings to ensure that necessary functions are enabled.

<?php
// Ensure error reporting is enabled to catch any issues
error_reporting(E_ALL);
ini_set('display_errors', 1);

// Your PHP script code here
?>