What error message indicates that the maximum execution time has been exceeded in PHP?

When the maximum execution time has been exceeded in PHP, the error message "Maximum execution time of xx seconds exceeded" is displayed. This error occurs when a script takes longer to execute than the maximum time allowed by the server configuration. To solve this issue, you can increase the maximum execution time in the php.ini file or optimize your code to reduce the execution time.

// Increase the maximum execution time to 60 seconds
ini_set('max_execution_time', 60);