<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <?php echo "hello"; require_once "People.php"; $m = new People(); $m->showInfo(); People::sayHello(); echo People::MAX_MAN_NUM; //for($i=0;$i<10;$i++) { //$m = new People(); //} require_once "Man.php"; $m = new Man(25, "bigwu"); $m->sayHi(); ?> </body> </html>