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# trigger_error

(PHP 4 )

trigger_error -- Generates a user-level error/warning/notice message

## Description

``void trigger_error` (string error_msg [, int error_type])`

Used to trigger a user error condition, it can be used by in conjunction with the built-in error handler, or with a user defined function that has been set as the new error handler (set_error_handler()). It only works with the E_USER family of constants, and will default to `E_USER_NOTICE`.

This function is useful when you need to generate a particular response to an exception at runtime. For example:

    if (assert ($divisor == 0))
       trigger_error ("Cannot divide by zero", E_USER_ERROR);

> Note: See set_error_handler() for a more extensive example.

See also error_reporting(), set_error_handler(), restore_error_handler(), user_error()

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