PHP Trigger_error Trigger PHP Error Example _php tutorial

Example of PHP error triggered by Trigger_error in PHP

This article mainly introduces the PHP error triggered by the PHP trigger_error example, this article describes the error suppressor @ and through Trigger_error trigger PHP error example, the need for friends can refer to the following

Example of PHP error triggered by Trigger_error in PHP

"Error suppressor @"

In addition to the settings of error_reporting and display_errors in PHP.ini, the error_reporting () function, the Ini_set () function, you can also use the error suppressor @ Mask error output.

@ is added before any expression that produces an error.

"Triggering PHP errors via Trigger_error"

The ability to trigger errors is not limited to the PHP parser, but it can be triggered by the trigger_error () function, which, like an exception thrown in an exception, throws an error that can assist in debugging the code.

Cases

The code is as follows:

　　

$num 1 = 1;

$num 2 = ' 2 ';

if (! ( Is_numeric ($num 1) && is_numeric ($num 2))) {

Manually throwing notification-level errors

Trigger_error (' Num1 and num2 must be a legal value ', e_user_notice);

}else{

echo $num 1 + $num 2;

}

Echo '
The program continues to execute downward ';

Output:

The code is as follows:

3

Program continues to execute down

and

The code is as follows:

　　

$num 1 = 1;

$num 2 = ' 2a ';

if (! ( Is_numeric ($num 1) && is_numeric ($num 2))) {

Manually throwing notification-level errors

Trigger_error (' Num1 and num2 must be a legal value ', e_user_notice);

}else{

echo $num 1 + $num 2;

}

Echo '
The program continues to execute downward ';

Output:

The code is as follows:

( ! ) NOTICE:NUM1 and num2 must be valid values in D:\practise\php\Error\error1.php on line 6

Program continues to execute down

"Other" when a critical error such as a database connection is not up, you can manually throw an error-replace PHP's built-in e_warning warning with E_user_error.

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