Exception + Error = Throwable Tree in PHP 7 over

• PHP Throwable Tree

  • Introduction

  • Example & Output

    • ArithmeticError

    • DivisionByZeroError

    • AssertionError

    • ArgumentCountError

    • TypeError

  • Runtime Exceptions

Introduction

PHP 7.x introduces new Throwable interface together Error and Exception.

Interface Throwable
+-- Error
|   +-- ArithmeticError
|   |   +-- DivisionByZeroError
|   +-- AssertionError
|   +-- CompileError (PHP 7.3 over)
|       +-- ParseError
|   +-- TypeError
|       +-- ArgumentCountError
+-- Exception
    +-- ClosedGeneratorException
    +-- DOMException
    +-- ErrorException
    +-- IntlException
    +-- LogicException
    |   +-- BadFunctionCallException
    |   |   +-- BadMethodCallException
    |   +-- DomainException
    |   +-- InvalidArgumentException
    |   +-- LengthException
    |   +-- OutOfRangeException
    +-- PharException
    +-- ReflectionException
    +-- RuntimeException
        +-- mysqli_sql_exception
        +-- OutOfBoundsException
        +-- OverflowException
        +-- PDOException
        +-- RangeException
        +-- UnderflowException
        +-- UnexpectedValueException

Example & Output

ArithmeticError

<?php

intdiv(PHP_INT_MIN, -1);

// output
// Fatal error: Uncaught ArithmeticError: Division of PHP_INT_MIN by -1 is not an integer

DivisionByZeroError

<?php

$a = 3%0;

// output
// PHP Fatal error:  Uncaught DivisionByZeroError: Modulo by zero

$a = intdiv(3, 0); // 3/0 is not fire exception.

// output
// PHP Fatal error:  Uncaught DivisionByZeroError: Division by zero

AssertionError

<?php

ini_set('assert.exception', 1); //if without this, not exception but error

assert(2 < 1);

// output
// PHP Fatal error:  Uncaught AssertionError: assert(2 < 1) in...

ArgumentCountError

<?php

declare(strict_types=1); //if without this, not exception but error

$a = [1,2=>[3,4]];

count($a, COUNT_RECURSIVE, 'throw error');

// output
// PHP Fatal error:  Uncaught ArgumentCountError: count() expects at most 2 parameters, 3 given

TypeError

<?php

a('throw error');

function a(int $b) {}

// output
// PHP Fatal error:  Uncaught TypeError: Argument 1 passed to a() must be of the type int, string given

Runtime Exceptions

Name	Example
LogicException	LogicException.php