PHP 7 Error Handling

PHP 7 新特性PHP 7 New Features

PHP 7 changed the way most errors are reported. Unlike the traditional error reporting mechanism of PHP 5, most errors are now thrown asErrorexceptions.

This Error exception can be caught by try / catch blocks just like a normal exception. If there is no matching try / catch block, the exception handler function (registered by set_exception_handler()) is called to handle it. If no exception handler function has been registered, it is handled in the traditional way: reported as a fatal error.

The Error class is not extended from the Exception class, so code like catch (Exception $e) { ... } cannot catch Error. You can use code like catch (Error $e) { ... }, or register an exception handler function (set_exception_handler()) to catch Error.

Error exception hierarchy

  • Error
    • ArithmeticError
    • AssertionError
    • DivisionByZeroError
    • ParseError
    • TypeError
  • Exception
    • ...

Example

Example

<?php
class MathOperations
{
   protected $n = 10;

   // Modulo operation, divisor is 0, throws an exception
   public function doOperation(): string
   {
      try {
         $value = $this->n % 0;
         return $value;
      } catch (DivisionByZeroError $e) {
         return $e->getMessage();
      }
   }
}

$mathOperationsObj = new MathOperations();
print($mathOperationsObj->doOperation());
?>

The output of the above program is:

Modulo by zero

PHP 7 新特性PHP 7 New Features

Other extensions