PHP custom error handling function trigger_error()_PHP tutorial

Definition and Usage The trigger_error() function creates a user-defined error message.
trigger_error() is used to trigger an error message under user-specified conditions. It is used with the built-in error handler or with user-defined functions created with the set_error_handler() function.

If an illegal error type is specified, this function returns false, otherwise it returns true.
Syntax trigger_error(error_message,error_types)
Parameter description error_message is required. Specifies the error message. Length limit is 1024 characters. error_types are optional. Specifies the error type of the error message. Possible values: •E_USER_ERROR
•E_USER_WARNING
•E_USER_NOTICE

Copy code The code is as follows:

< ?php
function myError($errno,$errstr,$errfile,$errline){
switch($errno){
case E_USER_ERROR:
echo "My ERROR";
echo "Fatal error in line $errline of file $errfile";
exit(1);
break;
case E_USER_WARNING:
echo "My WARNING [$errno] $errstr";
break;
default:
echo "Unknown error type:[$errno] $errstr";
break;
}
}
set_error_handler("myError");
$age=-100;
if($age<0){
trigger_error('age you input must>=0',E_USER_ERROR);
}
?>

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