Facebook Get Access Token

mewnich.php

<?php
function iCurl($url, $data = false, $header = false) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.81 Safari/537.36');
    if($header){
        curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
    }
    if($data){
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    }
    return curl_exec($ch);
}

function prettyPrint($str) {
    return '<pre>'.print_r($str, true).'</pre>';
}

///////////////////////////////

function makeSig(&$data) {
    $sig = '';
    foreach ($data as $key => $value) {
        $sig .= "{$key}={$value}";
    }
    return md5($sig.'62f8ce9f74b12f84c123cc23437a4a32');
}

function getToken($user, $pass) {
    $header = array(
        "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.81 Safari/537.36"
    );
    $data = array(
        "api_key" => "882a8490361da98702bf97a021ddc14d",
        "credentials_type" => "password",
        "email" => $user,
        "format" => "JSON",
        "generate_machine_id" => "1",
        "locale" => "en_US",
        "method" => "auth.login",
        "password" => $pass,
        "return_ssl_resources" => "1",
        "v" => "1.0"
    );
    $data['sig'] = makeSig($data);
    return iCurl('https://api.facebook.com/restserver.php?'.http_build_query($data), false, $header);
}

function shield($token, $uid, $status) {
    $header = array(
        "User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.81 Safari/537.36",
        "Authorization: Bearer {$token}"
    );
    $data = array(
        "variables" => json_encode(array(
            "input" => array(
                "is_shielded" => "{$status}",
                "actor_id" => $uid,
                "client_mutation_id" => "b0316dd6-3fd6-4beb-aed4-bb29c5dc64b0"
            )
        )),
        "doc_id" => "1477043292367183",
        "access_token" => "{$token}"
    );
    return iCurl('https://graph.facebook.com/graphql', $data, $header);
}
?>