<?php
//ini_set('display_errors','On');
//error_reporting('E_ALL');
header('Content-Type: text/html; charset=utf-8');
$tmi_key = 'tmi_key';
if (isset($_GET['channel']) && !empty($_GET['channel'])) {
    $channel = $_GET['channel'];
} else {
    echo 'Введите название канала.';
    return;
}
if (!preg_match('/^[a-zA-Z0-9_]{5,25}$/', $_GET['channel'])) {
    echo 'Ошибка, попытка ввести неправильные данные.';
    return;
}
$uptime = file_get_contents("https://crashmax.ru/twitch/uptimetest.php?channel=$channel");
$url = sprintf('https://api.twitch.tv/kraken/streams/%s', $channel);
$ch = curl_init();
curl_setopt($ch, CURLOPT_HTTPHEADER, ['Client-ID: '.$tmi_key]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, True);
curl_setopt($ch, CURLOPT_URL, $url);
$response = json_decode(curl_exec($ch), true);
//var_dump($response);
if ($response['stream'] != NULL) {
    echo $response['stream']['channel']['display_name'], ' стримит ', $response['stream']['game'];
    echo ' Title: ',$response['stream']['channel']['status'];
    echo ' Viewers: ',$response['stream']['viewers'];
    echo ' Uptime: ',$uptime;
} else {
    echo $channel,' не в сети.';
}
?>