PHP Manual . Prev . ... Including Output in phpinfo() . Execution Information . Often it's necessary to print messages to the output stream from your module, just as print() would be used within a script. PHP offers functions for most generic tasks, such as printing warning messages, generating output for phpinfo() , and so on. ... Examples of these functions can be found on the CD-ROM. zend_printf() works like the standard printf() , except that it prints to Zend's output stream. ...