I want to work with the tumblr API, however it looks like I failed at it yet. Do you have any clues for me?

tumblrClass.php

<?php
/**
 * User: dmendek
 * Date: 18.07.12
 * Time: 16:09
 */

class tumblrClass {

    // ----------------------------------------------------------#
    // ----------------------------------------------------------#
    // ----------------------------------------------------------#

    // Blog-Details
    public static $apikey = 'x';
    public static $nameBlog = 'mendavify';

    // Wichtig innerhalb der Klasse
    private static $errorContainer;
    public $jsonArray;

    // ----------------------------------------------------------#
    // ----------------------------------------------------------#
    // ----------------------------------------------------------#

    public static function readInfo() {

        return self::jsonToArray(self::jsonGet('http://api.tumblr.com/v2/blog/'.self::$nameBlog.'.tumblr.com/info?api_key='.self::$apikey));

    }

    public static function readPosts() {

        return self::jsonToArray(self::jsonGet('http://api.tumblr.com/v2/blog/'.self::$nameBlog.'.tumblr.com/posts/text?api_key='.self::$apikey));

    }

    private function jsonGet($url) {

        return json_decode(file_get_contents($url), true);

    }

    private function jsonToArray($json) {

        // short conditionals -> http://tinyurl.com/cl6ru4t
        return (!$json) ? self::throwException(__FUNCTION__, __LINE__) : $json;

    }

    private static function throwException($functionName, $exLine) {

        self::$errorContainer[] = 'Error in function <strong>'.$functionName.'</strong> on line <strong>'.$exLine.'</strong>';

    }

    // Destructor der Klasse, falls Fehler auftraten werden diese ausgegeben
    public function __destruct() {

        if(!empty(self::$errorContainer)) print_r(self::$errorContainer);

    }


}


$tumblr = new tumblrClass();
$tumblr->readInfo();