e-sim work train script

wt.php

<?php 

function crul($url,$header,$cookie_path,$post=false,$cookie=false){ 
    $ch = curl_init($url); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
    curl_setopt($ch, CURLINFO_HEADER_OUT, true); 
    curl_setopt($ch, CURLOPT_HEADER, 1); 
    if($post !== false){ 
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post); 
    } 
    curl_setopt($ch, CURLOPT_HTTPHEADER,$header); 
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0); 
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); 
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 0); 
    curl_setopt($ch, CURLOPT_REFERER, "https://alpha.e-sim.org/"); 
    curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie_path); 
    if($cookie!==false){ 
        curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie_path); 
    } 
    $result = curl_exec($ch); 
    return $result; 
} 

function cookie_to_str($data){ 
    preg_match_all('/^Set-Cookie:\s*([^;]*)/mi', $data, $matches); 
    $cookies = array(); 
    foreach($matches[1] as $item) { 
        parse_str($item, $cookie); 
        $cookies = array_merge($cookies, $cookie); 
    } 
    foreach ($cookies as $name => $value) { 
        $cookie_str .= $name . " =" . $value . ";"; 
    } 
    return $cookie_str; 
} 
function login($username,$password,$header,$cookie_path){ 
    $result = crul("https://alpha.e-sim.org",$header,$cookie_path); 
    $cookie_str = cookie_to_str($result); 
    $header[] = 'Cookie:'.$cookie_str; 
    $post_data = array('login'=>$username,'password'=>$password); 
    $post_data = http_build_query($post_data); 
    $result = crul("https://alpha.e-sim.org/login.html",$header,$cookie_path,$post_data,true); 
    $res = ['cookie'=>$cookie_str,'res'=>$result]; 
    return $res; 
} 

function work($cookie_path,$header){ 
    $post_data = array('action'=>'work'); 
    $post_data = http_build_query($post_data); 
    $header[]='X-Requested-With: XMLHttpRequest'; 
    $res = crul("https://alpha.e-sim.org/work/ajax?action=work",$header,$cookie_path,$post_data,true); 
    return $res; 
} 

function train($cookie_path,$header){ 
    $post_data = array('action'=>'train'); 
    $post_data = http_build_query($post_data); 
    $header[]='X-Requested-With: XMLHttpRequest'; 
    $res = crul("https://alpha.e-sim.org/train/ajax",$header,$cookie_path,$post_data,true); 
    return $res; 
} 


$header = array( 
'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8', 
'Connection: keep-alive', 
'Host: alpha.e-sim.org', 
//'Origin: https://alpha.e-sim.org', 
'Referer: https://alpha.e-sim.org/', 
'Upgrade-Insecure-Requests: 1', 
'User-Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36' 
); 

$username = $_GET["username"]; 
$password = $_GET["password"]; 

$cookie_path = "./cookies/".$username.".txt"; 

$res = login($username,$password,$header,$cookie_path); 
$work = work($cookie_path,$header); 
$train = train($cookie_path,$header); 
?>

Hello, how do I use this?