Helps deploy a Gitlab repo to the server location (includes clone and pull upon every commit to master branch)

gitlab-webhook.php

<?php
/* gitlab deploy webhook */
define('GITLAB_VALIDATE_REQUEST_TOKEN', 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx');
define('GITLAB_PERSONAL_ACCESS_TOKEN', 'xxxxxxxxxxxxxxxxxxxx');
define('GITLAB_USERNAME', 'xxxxxxxxxx');
$repositories = array('xxxxxxxxxx');

ob_start();
try {

    $request_headers = getallheaders();
    $json = file_get_contents('php://input');
    $request_data = json_decode($json, true);

    $debug_file = './webhook-debug.log';
    if($f = fopen($debug_file, 'a')) {
        fwrite($f,
            '---------------------------------------------------'.PHP_EOL
            .date('Y-m-d H:i:s').PHP_EOL
            .print_r($request_headers, true).PHP_EOL
            .print_r($request_data, true).PHP_EOL.PHP_EOL);
        fclose($f);
    }

    if(isset($request_headers['X-Gitlab-Token'])
    && $request_headers['X-Gitlab-Token'] == constant('GITLAB_VALIDATE_REQUEST_TOKEN')
    && isset($request_data['repository']['name'])
    && in_array($request_data['repository']['name'], $repositories)
    && isset($request_data['ref'])
    && $request_data['ref'] == 'refs/heads/master') {
        $repository_slug = $request_data['repository']['name'];
        $repository_url = str_replace('https://', 'https://'.constant('GITLAB_USERNAME').':'.constant('GITLAB_PERSONAL_ACCESS_TOKEN').'@', $request_data['repository']['git_http_url']);
        if(!is_dir('./'.$repository_slug)) {
            exec('git clone '.$repository_url);
        } else {
            exec('cd '.getcwd().'/'.$repository_slug.' && git checkout master && git pull origin master >> '.getcwd().'/'.$repository_slug.'-deploy.log && echo "" >> '.getcwd().'/'.$repository_slug.'-deploy.log');
        }
    }

} catch(Exception $e) {
    echo 'ERROR: '.$e->getMessage();
}
ob_get_clean();

exit();