How to customize error handling using PHP built-in functions?

PHP provides multiple built-in functions, such as set_error_handler and set_exception_handler, for custom error and exception handling. You can register custom functions to handle error (error number, error message, file and line number) and exception (exception object) information to provide better error handling and meaningful error messages.

How to use PHP built-in functions to customize error handling

PHP has many built-in functions that can be used to customize error handling mechanisms. Let’s find out.

1. set_error_handler()

This function allows you to register a custom error handling function. When an error occurs, this function will be called and the error information will be passed as a parameter.

Example:

function myErrorHandler($errno, $errstr, $errfile, $errline)
{
    echo 'Error: ' . $errstr . ' in file ' . $errfile . ' on line ' . $errline;
}

set_error_handler('myErrorHandler');

2. set_exception_handler()

In addition to errors, you can also customize exception handling. set_exception_handler() allows you to register an exception handling function for your application.

Example:

function myExceptionHandler($exception)
{
    echo 'Exception: ' . $exception->getMessage() . ' in file ' . $exception->getFile() . ' on line ' . $exception->getLine();
}

set_exception_handler('myExceptionHandler');

Practical case

Suppose you have a PHP script that contains mathematical functions. Please use these built-in functions to handle errors and exceptions:

function divide($numerator, $denominator)
{
    try {
        if ($denominator == 0) {
            throw new Exception('Division by zero is not allowed');
        }

        return $numerator / $denominator;
    } catch (Exception $e) {
        echo 'Exception: ' . $e->getMessage();
    }
}

set_error_handler(function($errno, $errstr, $errfile, $errline) {
    echo 'Error: ' . $errstr . ' in file ' . $errfile . ' on line ' . $errline;
});

$result = divide(10, 2); // 5
$result = divide(10, 0); // Exception: Division by zero is not allowed

This way you can flexibly handle errors and exceptions in your application and provide meaningful error messages.

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