<?php

$opts = array( 
  "http"=>array("method"=>"GET", "header"=>"Cookie: spip_session=***\r\n")
);
$context = stream_context_create($opts);
$resp = file_get_contents("https://api.www.root-me.org/auteurs/1", false, $context);
$data = json_decode($resp);
echo(print_r($data));