Sending a message via php and curl to a flowdock "flow"

Flowdock.php

<?php
/**
 * Send an message to a Flowdock "flow".
 *
 * # Initialization:
 * <code>
 * $fd = new Flowdock();
 * $fd->setToken('asdadsads');
 * </code>
 *
 * or
 *
 * <code>
 *  $fd = new Flowdock();
 * </code>
 *
 * # Usage:
 *
 * ## Send to chat:
 *
 * <code>
 *  $res = $fd->pushToChat('Message', 'external_username', array('test','tag'));
 * </code>
 *
 * ## Send to inbox
 *
 * <code>
 *  $res = $fd->pushToInbox('New test', '[email protected]', 'Subject', 'This is a test message');
 * </code>
 */
class Flowdock {

	/**
	 * @var string
	 */
	protected $token = '';

	/**
	 * @param string $token - the flowdock api key for a channel
	 *
	 */
	public function __construct($token='') {
		$this->token = $token;
	}

	/**
	 * Get the currently set API token
	 *
	 * @return string
	 */
	public function getToken() {
		return $this->token;
	}

	/**
	 * Set the API token
	 *
	 * @return Flowdock
	 */
	public function setToken($token) {
		$this->token = $token;
		return $this;
	}

	/**
	 * Sends a message to the chat
	 *
	 * @param string $content
	 * @param string $externalUserName
	 * @param array $tags
	 * @return string - the result, should be '{}'
	 */
	public function pushToChat($content, $externalUserName, $tags = array()) {

		$data = array(
			'content' => $content,
			'external_user_name' => $externalUserName,
			'tags' => implode(',', $tags)
		);
		return $this->push('https://api.flowdock.com/v1/messages/chat/', $data);

	}
	/**
	 * Sends a message to the inbox
	 *
	 * Required:
	 * @param $source - Human readable identifier of the application that uses the Flowdock API. Only alphanumeric characters,
	 *       underscores and whitespace can be used. This identifier will be used as the primary method of
	 *     categorization for the messages. Example value: Awesome Issue Management App
	 * @param $from_address - Email address of the message sender. The email address is used to show a avatar of the
	 *        sender. You can customize the avatar by registering the address in Gravatar.
	 *        Example value: [email protected]
	 * @param $subject - Subject line of the message, will be displayed as the title of Team Inbox message.
	 * @param $content - Content of the message, will be displayed as the body of Team Inbox message.
	 *
	 * Optional:
	 * @param $from_name - Name of the message sender. Example value: John Doe
	 * @param $reply_to - Email address for replies, will be used when replying to the message from Flowdock.
	 * @param $project - Human readable identifier for more detailed message categorization. Only alphanumeric characters,
	 *      underscores and whitespace can be used. This identifier will be used as the secondary method of
	 *       categorization for the messages. Example value: My Project
	 * @param $tags - Tags of the message, separated by commas. Example value: cool,stuff
	 * @param $link - Link associated with the message. This will be used to link the message subject in Team Inbox.
	 *      Example value: http://www.flowdock.com/
	 */
	public function pushToInbox($source, $from_address, $subject, $content, $from_name=null, $reply_to = null,
		$project = null,
		$tags = array(), $link=null) {

		$data = array(
			'source' => $source,
			'from_address' => $from_address,
			'subject' => $subject,
			'content' => $content,
			'format' => 'html'
		);

		if ($from_name) {
			$data['from_name'] = $from_name;
		}

		if ($reply_to) {
			$data['reply_to'] = $reply_to;
		}

		if ($project) {
			$data['project'] = $project;
		}

		if ($tags) {
			$data['tags'] = $tags;
		}

		if ($link) {
			$data['link'] = $link;
		}

		return $this->push('https://api.flowdock.com/v1/messages/team_inbox/', $data);
	}

	/**
	 * Do a curl request to Flowdock
	 *
	 * @param string $url - the REST API endpoint url
	 * @param array $data
	 */
	protected function push($url, $data) {
		$ch = curl_init($url.$this->token);
		curl_setopt($ch, CURLOPT_POST, true);
		curl_setopt($ch, CURLOPT_POST, 1);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
		curl_setopt($ch, CURLOPT_TIMEOUT, 10);
		curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
		$result = curl_exec($ch);
		if (curl_error($ch)) {
			echo(curl_error($ch)).PHP_EOL;
			exit(1);
		}
		$info = curl_getinfo($ch);
		curl_close($ch);
		return $result;
	}
}