Php method for loading another file class

How to load another file class

a.php and b.php under current file , want to introduce Class A in class B

<?php
class A
{
Public $name = ' Zhouqi ';
Public function say ()
{
echo ' Hello '. $this->name;
}
}

<?php
classB
{
Require (' a.php '); Error, the class cannot contain files directly, but you can include the file in the methods of the class definition outside or in the class
$c = new A (); Error, a class cannot instantiate another class directly, and another class should be instantiated in a method in a class
Public functionUsea () {
Contains a.php and instantiation Class A
require(' a.php ');
$person =NewA ();
$person->name = ' Erbao ';
$person->say ();
}
}

$person 3 =Newb ();
$person 3->usea ();

Php method for loading another file class