PHP Handbuch
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trigger_error

(PHP 4 >= 4.0.1)

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()). 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);

Anmerkung: 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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