Why Isn't My PHP Code Executing Despite Appearing in the Browser Source?

PHP Code Execution Failure: Troubleshooting Invisible Code

Encountering PHP code that appears in the browser source yet fails to execute can be frustrating. Here are various solutions to troubleshoot this issue:

1. Verify Web Server Access:
   Ensure that you are accessing the PHP file through a web server using a URL (e.g., http://localhost/file.php). Local file access (e.g., file://localhost/www/file.php) will not trigger PHP execution.
2. PHP Installation Verification:
   Confirm that PHP is installed and operational. Execute "php -v" in the command line to display version information or error messages.
3. Apache Module Configuration:
   Check your Apache's httpd.conf file. Ensure that the PHP module is listed and uncommented. Look for a line like "LoadModule php5_module "c:/php/php5apache2_2.dll"" and remove any preceding ";".
4. PHP MIME Type in httpd.conf:
   Locate the "AddType application/x-httpd-php .php" line in httpd.conf. This setting indicates that Apache should execute .php files as PHP. Ensure this line is present and uncommented.
5. File Extension Verification:
   Confirm that the file in question has the ".php" extension or the extension specified in the MIME definition in point 4. Otherwise, the file will not be processed as PHP.
6. Short Tags Disablement:
   Avoid using short tags (

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