yo.php

<?php

class Yo {

 protected $_apiKey;

 private $urls = array(
 'all' => 'http://api.justyo.co/yoall/',
 'user' => 'http://api.justyo.co/yo/',
 'subscribers' => 'http://api.justyo.co/subscribers_count/'
 );

 public function __construct($apiKey) {
 $this->_apiKey = $apiKey;
 }
 
 public function user($username) {
 if ($username != '') {
 $this->processRequest($username);
 }
 }

 public function all() {
 $this->processRequest();
 }

 public function subscribers() {
 $url = $this->urls['subscribers'];

 $url .= '?api_token=' . $this->_apiKey;

 $options = array(
 CURLOPT_URL => $url,
 CURLOPT_RETURNTRANSFER => true,
 CURLOPT_TIMEOUT => 10,
 );

 $curl = curl_init();
 curl_setopt_array($curl, $options);
 $result = curl_exec($curl);
 curl_close($curl);
 
 // Result is in format {"result": 1 }
 $result = json_decode($result, true);
 
 if (isset($result['result'])) {
 return $result['result'];
 }

 return false;
 }

 private function processRequest($username = '') {
 $postFields = array(
 'api_token' => $this->_apiKey
 );

 $url = $this->urls['all'];

 if ($username != '') {
 $postFields['username'] = $username;
 $url = $this->urls['user'];
 }

 $options = array(
 CURLOPT_URL => $url,
 CURLOPT_RETURNTRANSFER => true,
 CURLOPT_TIMEOUT => 10,
 CURLOPT_POST => true,
 CURLOPT_POSTFIELDS => $postFields
 );

 $result = '';

 $curl = curl_init();
 curl_setopt_array($curl, $options);
 $result = curl_exec($curl);
 curl_close($curl);

 return $result;
 }

}