PHP Git Deployment Script, deploy your repo with GitHub zipball

deploy.php

<?php

//error_reporting(E_ERROR);
set_time_limit(600);

$owner = '';
         // repo owner
$repo  = '';
         // repo namespace
$token = '';
         // access token, only required when it's a private repo
         // to create a token, go to https://github.com/settings/tokens
$tmp   = './';
         // tmp dir, end with '/'
$dir   = './';
         // output dir, end with '/'

// DO NOT MODIFIED THE CONTENT BELOW, ONLY IF YOU HAVE A GOOD REASON

header('Content-Type: text/plain; charset=utf-8');

echo "Git Deployment Script\n";
echo "Deploy your repo with GitHub zipball\n";
echo "@version	0.2\n";
echo "@author	ccloli\n\n";
flush();
ob_flush();

echo "Downloading repo package...";
flush();
ob_flush();

// use legacy HTTP GET parameters is okay
$url = 'https://api.github.com/repos/' . urlencode($owner) . '/' . urlencode($repo) . '/zipball';
if ($token) {
	$url .= '?access_token=' . urlencode($token);
}

// we need to set a User Agent, or GitHub will give 403 Forbidden
$opts = array(
	'http' => array(
		'user_agent' => 'Git Deployment Script'
	)
); 
$fp = fopen($url, 'rb', false, stream_context_create($opts));

$httpCode = substr($http_response_header[0], 9, 3);
switch (substr($httpCode, 0, 1)) {
	case '4':
		echo "FAILED!\nSeems that the repo doesn't exist or the access token isn't correct.";
		echo "Response Headers:\n";
		var_dump($http_response_header);
		exit;
		break;
	case '5':
		echo "FAILED!\nSeems that GitHub has some problem, follow GitHub Status and try again later.";
		echo "Response Headers:\n";
		var_dump($http_response_header);
		exit;
		break;
}

foreach ($http_response_header as $value) {
	if (strpos($value, 'Content-Disposition') !== FALSE && strpos($value, 'filename=') !== FALSE) {
		$fileName = substr($value, strpos($value, 'filename=') + 9);
		break;
	}
}
if (!isset($fileName)) {
	$fileName = $repo . '.zip';
}

file_put_contents($tmp . $fileName, $fp);
echo "OK!\n";
flush();
ob_flush();

echo 'Decompressing the archive...';
flush();
ob_flush();

$zip = new ZipArchive;
if ($zip -> open($fileName) !== TRUE) {
	echo "FAILED!\nCannot open the zip file.";
	exit;
}
$zip -> extractTo($tmp);
$zip -> close();
echo "OK!\n";
flush();
ob_flush();

echo 'Replacing with new files...';
flush();
ob_flush();
// the dir name will be the zip file name
$filesDir = $tmp . explode('.', $fileName, 2)[0];
$newFiles = scandir($filesDir);
foreach ($newFiles as $file) {
	if ($file != '.' && $file != '..') {
		// unlink and loop rmdir really makes me dizzy
		//unlink($dir . $file);
		if (is_dir($dir . $file)) {
			if (PHP_OS === 'Windows' || PHP_OS === 'WINNT') {
				exec('rd /s /q "' . $dir . $file . '"');
			}
			else {
				exec('rm -rf "' . $dir . $file . '"');
			}
		}
		else {
			unlink($dir . $file);
		}
		rename($filesDir . '/' . $file, $dir . $file);
	}
}
echo "OK!\n";
flush();
ob_flush();

echo 'Removing temp files...';
flush();
ob_flush();
unlink($tmp . $fileName);
rmdir($filesDir);
echo "OK!\nDeploy finished!";