php script for github webhook

gistfile1.php

<?php
function output($log) {
    echo $log . "\n";
    file_put_contents('lastrun', $log);
}

$log = date('r') . "\n";
if (empty($_POST['payload'])) {
    output($log . "No payload");
    exit(1);
}
$decoded = json_decode($_POST['payload'], true);
$log .= print_r($decoded, true);

if ($decoded['ref'] != "refs/heads/master") {
    output($log . "Not master - " . $decoded['ref']);
    exit(1);
}

$log = $log . $decoded['repository']['name'] . "\n";
switch ($decoded['repository']['name']) {
    case 'pilotfish.io':
        `touch deploy_pilotfish.io`;
        break;
    case 'pilotfish.github.com':
        `touch deploy_pilotfish.github.com`;
        break;
    case 'aboinga.com':
        `touch deploy_aboinga`;
        break;
    case 'creationeer.me':
        `touch deploy_creationeer`;
        break;
    case 'package.json-validator':
        `touch deploy_package.json-validator`;
        break;
    case 'positiveretribution':
        `touch deploy_positiveretribution`;
        break;
    default:
        $log = $log . 'Unrecognized repo:' . $decoded['repository']['name'] . "\n";
}

output($log);