Error implements Throwable.

\-Error
|-CompileError
| \-ParseError
|-TypeError
| \-ArgumentCountError
|-ArithmeticError
| \-DivisionByZeroError
\-AssertionError

• A calendar written with IntlCalendar class
• Basic usage of PDO
• iterator_to_array() to create a specific array data structure

PHP 7.4, Zend 3.0, Symfony 4.3, Laravel 5.8, PHPUnit 8.0, Doctrine 2.10