What could be causing the error message "Unable to load dynamic library 'C:\\php\\ext\\php_mysql.dll' - The specified module could not be found" when starting Apache?

The error message "Unable to load dynamic library 'C:\\php\\ext\\php_mysql.dll' - The specified module could not be found" indicates that the PHP extension for MySQL is not properly configured or missing. To solve this issue, you can either enable the php_mysql extension in your PHP configuration file or ensure that the php_mysql.dll file is located in the correct directory.

; Enable php_mysql extension
extension=php_mysql.dll