bitbucket webhook deployment script

deploy.php

<?php

$payload = json_decode(file_get_contents('php://input'));
if(!$payload)
{
	http_response_code(404);
	exit();
}

$branch = trim(`git branch | grep "\* \K.*$" -oP`);
$branches = new stdClass;

if(property_exists($payload,'push'))
{
	echo "push\n";
	foreach($payload->push->changes as $change)
	{
		if(property_exists($change,'old'))
		{
			$branches->{$change->old->name} = true;
		}
		if(property_exists($change,'new'))
		{
			$branches->{$change->new->name} = true;
		}
	}
}
else if(property_exists($payload,'pullrequest'))
{
	echo "pullrequest\n";
	$branches->{$payload->pullrequest->destination->branch->name} = true;
}
else
{
	http_response_code(403);
	exit('Unsupported web hook. Not a push or a merged pull request.');
}

if(!property_exists($branches,$branch))
{
	http_response_code(200);
	exit("No changes made to the deployed branch\n");
}
else
{
	http_response_code(201);
}

$commands = array
(
	"git fetch -f",
	"git reset --hard origin/$branch",
	"git status"
);

foreach($commands AS $command)
{
	exec("$command 2>&1",$cmdOutput,$errorStatus);
	$cmdOutput = htmlentities(trim(implode("\n",$cmdOutput)));
	if(strlen($cmdOutput))
	{
		$cmdOutput.="\n";
	}
	if($errorStatus)
	{
		http_response_code(500);
	}
	$errorText = $errorStatus?'FAILURE':'SUCCESS';

	echo

<<<EOF
$ $command
--- $errorText ---
$cmdOutput

EOF;

	if($errorStatus)
	{
		break;
	}
}

?>