<?php
echo 'This is line ' . __LINE__; // This is line 2

<?php
echo 'This is file ' . __FILE__; // This is file /home/user/scripts/code.php

<?php
echo 'This is dir ' . __DIR__; // This is dir /home/user/scripts

<?php
function magic() {
    echo  'This is function ' . __FUNCTION__;
}
magic(); // This is function magic

<?php
class MagicClass
{
    public function Frostbite(){
        return __CLASS__;
    }
}
$obj = new MagicClass();
echo $obj->Frostbite(); // MagicClass

<?php
trait MagicTrait {
    public function IceBlast() {
        echo  'This is trait ' . __TRAIT__;
    }
}
 
class IceMan {
    use MagicTrait;
}
 
$obj = new IceMan();
$obj->IceBlast(); // This is trait MagicTrait
 

<?php
trait MagicTrait {
    public function IceBlast() {
        echo  'This is trait ' . __METHOD__;
    }
}
 
class IceMan {
    use MagicTrait;
}
 
$obj = new IceMan();
$obj->IceBlast(); // This is trait IceMan::IceBlast

<?php
namespace MyWorld;
echo  'This is namespace ' . __NAMESPACE__; // This is namespace MyWorld

<?php
class IceMan {
      public function IceBlast() {
        echo  'This is class ' . __METHOD__;
    }
}
 
$obj = new IceMan();
$obj->IceBlast();  // This is class IceMan::IceBlast

use App\Http\Controllers\UserController;
Route::get('/user', [UserController::class, 'index']);