E_USER_WARNING

E_USER_WARNING is one of the accepted parameters for:

• error_reporting parameter #1 (optionally as a bitmask)
• trigger_error parameter #2
• user_error parameter #2

E_USER_WARNING is one of the return values for error_reporting.

E_USER_WARNING — User-generated warning message. This is like an E_WARNING, except it is generated in PHP code by using the PHP function trigger_error.

E_USER_WARNING = 512;