ตัวอย่างให้น้อง

<?php

//in Route:

Route::post('/testAuthen', 'LoginController@login');


//in Controller:
    private function authenticate( $username, $password ) {

        $post_data = http_build_query(
                array(
                        'url' => 'its2.cgi.ac.th',
                        'username' => $username,
                        'password' => $password
                )
        );

        $opts = array(
                'http' => array(
                        'method'  => 'POST',
                        'header'  => 'Content-type: application/x-www-form-urlencoded',
                        'content' => $post_data
                )
        );

        $context  = stream_context_create( $opts );
        $result = file_get_contents( self::AUTHEN_USER_URL, false, $context );

        $result_arr = json_decode( $result, true );

        return json_decode( $result, true );
    }

    public function login(Request $request)
    {
        echo $this->authenticate('natthawut', 'password');
    }