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run code in 200+ php & hhvm versions
Bugs & Features
<?php abstract class person { abstract protected function write_info(); public $LastName; public $FirstName; public $BirthDate; public function get_Age($today=NULL){ } } final class employee extends person{ public $EmployeeNumber; public $DateHired; public function write_info(){ echo "Writing ". $this->LastName . "'s info to emloyee dbase table"; } } final class student extends person{ public $StudentNumber; public $CourseName; public function write_info(){ echo "Writing ". $this->LastName . "'s info to student dbase table"; } } $personA = new employee; $personB = new student; $personA->FirstName="Joe"; $personA->LastName="Sbody"; $personB->FirstName="Ben"; $personB->LastName="Dover"; $personA->write_info(); ?> OUTPUT:Writing Sbody's info to emloyee dbase table
based on b3djC
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0rc3
Writing Sbody's info to emloyee dbase table OUTPUT:Writing Sbody's info to emloyee dbase table