exit; abstract class Human { public abstract function talk(); public abstract function eat(); public abstract function walk(); public function calcMath($a, $b) { echo $a * $b; } } class man extends Human { public function talk() { echo "Keep talking"; } public function eat() { echo "Keep eating"; } public function walk() { echo "Keep walking"; } } //$obj = new Character(); //Fatal error: Cannot instantiate abstract class $user = new man(); $user->talk(); $user->calcMath(5, 3);