/**
  * Fetch the userId and username of the poster of a pet and return a JSON formatted string with this data
  * @return string   in JSON format
  */
 public static function getPosterInfo()
 {
     $get = Core\Input::get();
     if (isset($get['petId'])) {
         $pet = Pet::constructById($get['petId']);
         $userId = $pet->getUserId();
         $user = User::constructById($userId);
         $userName = $user->getUsername();
         return json_encode(array('userId' => $userId, 'userName' => $userName));
     }
     return '{}';
 }
<?php

$get = Core\Input::get();
$post = Core\Input::post();
?>
<!DOCTYPE html>
<html lang="en">
    <?php 
require_once __DIR__ . '/components/head.php';
require_once __DIR__ . '/components/header.php';
?>
    <body>
    <?php 
$page = 'details';
$referrerPage = isset($get['referrer']) ? $get['referrer'] : 'home';
?>
    <div class="container">
        <div class="row contactTitleBox">
            <div class="col-md-4">
                <h4><strong>Manage Your Account</strong></h4>
            </div>
            <div class="col-md-8">
                <ul class="nav nav-tabs navbar-right">
                    <li role="presentation"><a href="/~<?php 
echo USER;
?>
/index.php/PetBasket/contactUpdate">Update Info</a></li>
                    <li role="presentation" class="active"><a href="#">My Pets</a></li>
                    <li role="presentation"><a href="/~<?php 
echo USER;
?>