How to throw exception in php7

PHP 7 changes the way most errors are reported. Unlike PHP 5's traditional error reporting mechanism, most errors are now thrown as Error exceptions.

This Error exception can be caught by a try / catch block like a normal exception. If there is no matching try / catch block, the exception handling function (registered by set_exception_handler()) is called for processing.

If the exception handling function has not been registered, it will be handled in the traditional way: it will be reported as a fatal error (Fatal Error). (Recommended learning: PHP Video Tutorial)

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

Error Exception Hierarchy

##Instance

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

   // 求余数运算，除数为 0，抛出异常
   public function doOperation(): string
   {
      try {
         $value = $this->n % 0;
         return $value;
      } catch (DivisionByZeroError $e) {
         return $e->getMessage();
      }
   }
}

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

The execution output of the above program is:

Modulo by zero

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