How do PHP functions return errors?

PHP functions can return errors in the following ways: directly return an error value: use the error_get_last() function to get the previous error information. Throw an exception: Use the throw keyword to create an exception object containing detailed information about the error.

How PHP functions return errors

In PHP, functions can return errors in two ways: directly returning an error value or throw an exception.

Return the error value directly

To directly return an error value, you can use the error_get_last() function. This function returns an array containing the previous error message. For example:

<?php

function divide($dividend, $divisor) {
  if ($divisor == 0) {
    return error_get_last();
  }

  return $dividend / $divisor;
}

echo divide(10, 2); // 5
echo divide(10, 0); // Array ( [type] => 2 [message] => Division by zero [file] => /path/to/file.php [line] => 10 )
?>

In this case, if the divide() function encounters a division by 0, it will return an error array, including the error type, error information, and error occurrence file and line number.

Throw an exception

To throw an exception, you can use the throw keyword. An exception is an object that contains detailed information about the error. For example:

<?php

class DivisionByZeroException extends Exception {}

function divide($dividend, $divisor) {
  if ($divisor == 0) {
    throw new DivisionByZeroException('Division by zero');
  }

  return $dividend / $divisor;
}

try {
  echo divide(10, 2); // 5
  echo divide(10, 0); // DivisionByZeroException: Division by zero
} catch (DivisionByZeroException $e) {
  echo $e->getMessage(); // Division by zero
}
?>

In this case, the divide() function will throw a DivisionByZeroException exception if it encounters a division by 0. The exception contains error information and can be accessed by the try-catch block that catches the exception.

The above is the detailed content of How do PHP functions return errors?. For more information, please follow other related articles on the PHP Chinese website!