【Thinkphp 5】 How to introduce extend extension file

extend/maile/cc.php file directory

cc file must be added with a namespace, as follows

cc.php file content is as follows:

namespace maile; //The namespace maile is the folder name class Cc { //Class name
public function ac(){ echo "chengjing";
}
}

In the controller Try it out

use maile\cc; //Reference the cc.php file in the maile folder

public function index()
{
$b=new Cc(); echo $b->ac(); // Output chengjing

}

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