Curl

$ku_twhitch = curl_init();
        $query = "response_type=token&client_id=".CLIENT_ID."&redirect_uri".REDIRECT_URI."&scope=".SCOPE;
        curl_setopt($ku_twhitch,CURLOPT_URL,URL_TWITCH_AUTCH."?".$query);
    curl_setopt($ku_twhitch,CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ku_twhitch,CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ku_to,CURLOPT_RETURNTRANSFER,TRUE);    
        $result = curl_exec($ku_twhitch);  
    print_r($result);    
        curl_close($ku_twhitch);

$twitch только access_token=l30o7l8pzo2t0jbfjlpey0635
$twitch = 'l30o7l8pzo2t0jbfjlpey0635';

curl_setopt($ku_to,CURLOPT_RETURNTRANSFER,TRUE);

<?php
 
$curl = curl_init('http://httpbin.org/redirect-to?' .
    http_build_query([ 'url' => 'http://example.org/#token=here' ])
);
curl_exec($curl);
$info = curl_getinfo($curl);
print_r($info['redirect_url'].PHP_EOL);
print_r(parse_url($info['redirect_url']));
curl_close($curl);

$curl = curl_init('http://httpbin.org/redirect-to?' .
    http_build_query([ 'url' => 'http://example.org/#token=here' ])
);

    curl_setopt  ($ku_twhitch, CURLOPT_HEADER, true);
curl_setopt  ($ku_twhitch, CURLOPT_RETURNTRANSFER, true);

https://api.twitch.tv/******/oauth2/authorize
    ?response_type=token
    &client_id=[your client ID]
    &redirect_uri=[your registered redirect URI]
    &scope=[space separated list of scopes]

      $ku_twhitch = curl_init();
        $query = "response_type=token&client_id=".CLIENT_ID."&redirect_uri=".REDIRECT_URI."&scope=".SCOPE;
        curl_setopt($ku_twhitch,CURLOPT_URL,URL_TWITCH_AUTCH."?".$query);
    curl_setopt($ku_twhitch,CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ku_twhitch,CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($ku_twhitch,CURLOPT_RETURNTRANSFER,TRUE);   
    $result = curl_exec($ku_twhitch);
    print_r($result);
        curl_close($ku_twhitch);

Array
(
    [url] => https://api.twitch.tv/******/oauth2/authorize?response_type=token&client_id=2mg5iu1j7828km3uf93sthi9zt11&redirect_uri=http://twitch.домен.ru/main.php&scope=user_read
    [content_type] => text/html; charset=utf-8
    [http_code] => 302
    [header_size] => 945
    [request_size] => 197
    [filetime] => -1
    [ssl_verify_result] => 0
    [redirect_count] => 0
    [total_time] => 0.881876
    [namelookup_time] => 2.7E-5
    [connect_time] => 0.210548
    [pretransfer_time] => 0.638096
    [size_upload] => 0
    [size_download] => 277
    [speed_download] => 314
    [speed_upload] => 0
    [download_content_length] => 277
    [upload_content_length] => 0
    [starttransfer_time] => 0.881838
    [redirect_time] => 0
    [certinfo] => Array
        (
        )
 
    [primary_ip] => 54.148.244.104
    [redirect_url] => https://api.twitch.tv/******/oauth2/authenticate?action=authorize&client_id=2mg5iu1j7828km3uf93sthi9zt11&redirect_uri=http%3A%2F%2Ftwitch.домен.ru%2Fmain.php&response_type=token&scope=user_read
)

echo $_SERVER['HTTP_HOST'].'<br />';
echo $_SERVER['PHP_SELF'].'<br />';
echo $_SERVER['QUERY_STRING'].'<br />';