<?php
set_time_limit(0);
function cURL($url,$header,$post,$cookie){
    $ch = curl_init();
        curl_setopt($ch,CURLOPT_URL,$url);
        curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_Setopt($ch,CURLOPT_CUSTOMREQUEST,($post)?"POST":"GET");
        curl_setopt($ch, CURLOPT_POSTFIELDS,$post);
        curl_setopt($ch,CURLOPT_COOKIE,$cookie);
        curl_setopt($ch,CURLOPT_HEADER,$header);
    $ex = curl_exec($ch);
    curl_close($ch);
    return $ex;
}
function PegarCookie(){
$post = "username=fernandocurty&password=12345678";
    $p_login = cURL("https://www.instagram.com/accounts/login/ajax/",1,$post,null);
    //preg_match("/Set-Cookie: ([^\n]+)/",$p_login,$r_cookie);
    return $p_login;
}
echo PegarCookie();
?>