PHP Send to Slack

<?php

$message = "Tes kirim ke Slack :)";
$data = "payload=" . json_encode(array(
    "channel"       => "#error_notifications",
    "text"          => $message,
    "username"      => 'Pemberi Tahu',
    "icon_url"      => 'URL Foto/Icon'
));

$ch = curl_init("URL WebHook");
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$result = curl_exec($ch);
curl_close($ch);