How can the ICU User Guide be utilized to find specific formatting options for datefmt_create() in PHP?

To find specific formatting options for datefmt_create() in PHP, you can refer to the ICU User Guide, which provides detailed information on date and time formatting patterns supported by ICU. By understanding the formatting options available in the ICU User Guide, you can customize the output of datefmt_create() to suit your specific requirements.

$fmt = datefmt_create('en_US', NULL, NULL, NULL, NULL, 'yyyy-MM-dd HH:mm:ss');
echo datefmt_format($fmt, time());