Github webhook quick example

hook.php

<?php

function writeLog($msg) {
    $fout = fopen('log.txt', 'w');
    fwrite($fout, $msg);
    fclose($fout);
}

$headers = getallheaders();
if (array_key_exists('X-Github-Event', $headers)) {
    if ($headers['X-Github-Event'] === 'push') {
        $body = file_get_contents('php://input');
        $data = json_decode($body);
        if ($data->ref === 'refs/heads/master') {
            writeLog("Something happened to master!\n\n");
        }
    }
}