Undefined property | Ошибка при использовании двух классов

Question

У меня следующие два класса:

Класс I:

<?php 

/** 
* Wrapper class for the Envato marketplaces API 
*/ 


class envato_api_wrapper { 

    protected $api_key; 
    protected $cache_dir = 'cache'; 
    public  $cache_expires = 2; 
    protected $public_url = 'http://marketplace.envato.com/api/edge/set.json'; 


    public function __construct($api_key = null) { 
    if (isset($api_key)) $this->api_key = $api_key; // allow the user to pass the API key upon instantiation 
    } 


/** 
    * Attach your API key. 
    * 
    * @param string $api_key Can be accessed on the marketplaces via My Account 
    * -> My Settings -> API Key 
    */ 
    public function set_api_key($api_key) 
    { 
    $this->api_key = $api_key; 
    } 


/** 
    * Retrieve the value of your API KEY, if needed. 
    * 
    * @return string The requested API Key. 
    */ 
    public function get_api_key() 
    { 
    if (! isset($this->api_key)) return 'No API Key is set.'; 
    return $this->api_key; 
    } 


/** 
    * Sets the cache directory for all API calls. 
    * 
    * @param string $cache_dir 
    */ 
    public function set_cache_dir($cache_dir) 
    { 
    $this->cache_dir = $cache_dir; 
    } 


/** 
    * Retrieve the value of your cache directory, if needed. 
    * 
    * @return string The requested cache directory. 
    */ 
    public function get_cache_dir() 
    { 
    return $this->cache_dir; 
    } 


    /** 
    * Available sets => 'vitals', 'earnings-and-sales-by-month', 'statement', 'recent-sales', 'account', 'verify-purchase', 'download-purchase' 
    * 
    */ 
    public function private_user_data($user_name, $set, $purchase_code = null) 
    { 
    if (! isset($this->api_key)) exit('You have not set an api key yet. $class->set_api_key(key)'); 
    if (! isset($set)) return 'Missing parameters'; 

    $url = "http://marketplace.envato.com/api/edge/$user_name/$this->api_key/$set"; 
    if (!is_null($purchase_code)) $url .= ":$purchase_code"; 
    $url .= '.json'; 

    $result = $this->fetch($url); 

    if (isset($result->error)) return 'Username, API Key, or purchase code is invalid.'; 
    return $result->$set; 
    } 


/** 
    * Can be used to verify if a person did in fact purchase your item. 
    * 
    * @param $user_name Author's username. 
    * @param $purchase_code - The buyer's purchase code. See Downloads page for 
    * receipt. 
    * @return object|bool If purchased, returns an object containing the details. 
    */ 
    public function verify_purchase($user_name, $purchase_code) 
    { 
    $validity = $this->private_user_data($user_name, 'verify-purchase', $purchase_code); 
    return isset($validity->buyer) ? $validity : false; 
    } 


/** 
    * Retrieve details for your most recent sales. 
    * 
    * @param string $user_name The username attached to your API KEY. 
    * @param int $limit The number of sales to return. 
    * @return array A list of your recent sales. 
    */ 
    public function recent_sales($user_name, $limit = null) 
    { 
    $sales = $this->private_user_data($user_name, 'recent-sales'); 
    return $this->apply_limit($sales, $limit); 
    } 


/** 
    * Retrieve your account information -- balance, location, name, etc. 
    * 
    * @param string $user_name The username attached to your API KEY. 
    * @return array A list of account information for the user. 
    */ 
    public function account_information($user_name) 
    { 
    $private_data = $this->private_user_data($user_name, 'account'); 
    return json_decode(json_encode($private_data), true); 
    } 


/** 
    * Grab quick monthly stats - number of sales, income, etc. 
    * 
    * @param string $user_name The username attached to your API KEY. 
    * @param int $limit The number of months to return. 
    * @return array A list of sales figures, ordered by month. 
    */ 
    public function earnings_by_month($user_name, $limit = null) 
    { 
    $earnings = $this->private_user_data($user_name, 'earnings-and-sales-by-month'); 
    return $this->apply_limit($earnings, $limit); 
    } 


/** 
    * Generic method, to be used in combination with the marketplace API docs. 
    * 
    * @param string $user_name The user name of the seller to track. 
    * @return array The returned data wrapped in an array. 
    */ 
    public function public_user_data($user_name) 
    { 
    $url = preg_replace('/set/i', 'user:' . $user_name, $this->public_url); 
    return $this->fetch($url, 'user'); 
    } 


/** 
    * Retrieve the details for a specific marketplace item. 
    * 
    * @param string $item_id The id of the item you need information for. 
    * @return object Details for the given item. 
    */ 
    public function item_details($item_id) 
    { 
    $url = preg_replace('/set/i', 'item:' . $item_id, $this->public_url); 
    return $this->fetch($url, 'item'); 
    } 


/** 
    * Similar to new_files, but focuses on a specific author's files. 
    * 
    * @param string $user_name The desired username. 
    * @param string $marketplace_name The desired marketplace name. 
    * @param int $limit The number of files to return. 
    * @return array A list of recently added files by one user. 
    */ 
    public function new_files_from_user($user_name, $marketplace_name = 'themeforest', $limit = null) 
    { 
    $cache_path = "$this->cache_dir/$user_name-$marketplace_name-new_files"; 

    $url = preg_replace('/set/i', 'new-files-from-user:' . $user_name . ',' . $marketplace_name, $this->public_url); 

    return $this->apply_limit($this->fetch($url, 'new-files-from-user'), $limit); 
    } 


    /** 
    * Display the number of items the author has for sale by marketplace 
    * 
    * @param string $user_name The desired username. 
    */ 
    public function user_items_by_site($user_name) 
    { 
    $cache_path = "$this->cache_dir/$user_name"; 

    $url = preg_replace('/set/i', 'user-items-by-site:' . $user_name, $this->public_url); 

    return $this->fetch($url, 'user-items-by-site'); 
    } 


/** 
    * Retrieves general marketplace member information. 
    * 
    * @param string $user_name The username to query. 
    * @return object Contains the requested user information. 
    */ 
    public function user_information($user_name) 
    { 
    $url = preg_replace('/set/i', 'user:' . $user_name, $this->public_url); 
    return $this->fetch($url, 'user'); 
    } 


    /* 
    * Either fetches the desired data from the API and caches it, or fetches the cached version 
    * 
    * @param string $url The url to the API call 
    * @param string $set (optional) The name of the set to retrieve. 
    */ 
    protected function fetch($url, $set = null) 
    { 
    // Use the API url to generate the cache file name. 
    // So: http://marketplace.envato.com/api/edge/collection:739793.json 
    // Becomes: collection-739793.json 
    $cache_path = $this->cache_dir . '/' . str_replace(':', '-', substr(strrchr($url, '/'), 1)); 

    if ($this->has_expired($cache_path)) { 
     // get fresh copy 
     $data = $this->curl($url); 

     if ($data) { 
      $data = isset($set) ? $data->{$set} : $data; // if a set is needed, update 
     } else exit('Could not retrieve data.'); 

     $this->cache_it($cache_path, $data); 

     return $data; 
    } else { 
     // if available in cache, use that 
     return json_decode(file_get_contents($cache_path)); 
    } 
    } 


/** 
    * Filters returned result, according to the supplied $limit. 
    * 
    * @param string $orig_arr The original array to work on. 
    * @param int $limit Specifies the number of array items in the result. 
    * @return array A new array with a count equal to the passed $limit. 
    */ 
    public function apply_limit($orig_arr, $limit) 
    { 
    if (!is_int($limit)) return $orig_arr; 

    // Make sure that there are enough items to filter through... 
    if ($limit > count($orig_arr)) $limit = count($orig_arr); 

    $new_arr = array(); 
    for ($i = 0; $i <= $limit - 1; $i++) { 
     $new_arr[] = $orig_arr[$i]; 
    } 
    return $new_arr; 
    } 


/** 
    * General purpose function to query the marketplace API. 
    * 
    * @param string $url The url to access, via curl. 
    * @return object The results of the curl request. 
    */ 
    protected function curl($url) 
    { 
    if (empty($url)) return false; 

    $ch = curl_init($url); 
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

    $data = curl_exec($ch); 
    curl_close($ch); 

    $data = json_decode($data); 

    return $data; // string or null 
    } 


    /* 
    * Caches the results request to keep from hammering the API 
    * 
    * @param string $cache_path - A path to the cache file 
    * @param string $data - The results from the API call - should be encoded 
    */ 
    protected function cache_it($cache_path, $data) 
    { 
    if (!isset($data)) return; 
    !file_exists($this->cache_dir) && mkdir($this->cache_dir); 
    file_put_contents($cache_path, json_encode($data)); 

    return $cache_path; 
    } 


    /* 
    * Determines whether the provided file has expired yet 
    * 
    * @param string $cache_path The path to the cached file 
    * @param string $expires - In hours, how long the file should cache for. 
    */ 
    protected function has_expired($cache_path, $expires = null) 
    { 
    if (!isset($expires)) $expires = $this->cache_expires; 

    if (file_exists($cache_path)) { 
     return time() - $expires * 60 * 60 > filemtime($cache_path); 
    } 

    return true; 
    } 


    /* 
    * Helper function that deletes all of the files in your cache directory. 
    */ 
    public function clear_cache(){ 
    array_map('unlink', glob("$this->cache_dir/*")); 
    } 
} 

Класс II:

<?php 

/** 
* Operation Class for Envato API Wrapper 
*/ 

class envato_api_class { 

    protected $api_key; 
    protected $username; 
    public  $envato_api_wrapper; 
    public  $path_to_envato_api_wrapper; 


    public function __construct($api_key = null, $username = null) { 
     if (isset($api_key)) { 
      $this->api_key = $api_key; 
     } elseif (isset($username)) { 
      $this->username = $username; 
     } 
     $this->path_to_envato_api_wrapper = 'envato_api_wrapper.php'; 
     require($this->path_to_envato_api_wrapper); 
     $this->envato_api_wrapper = new envato_api_wrapper($api_key); 
    } 

    public function get_all_items_by_site() { 
     $items_by_marketplace = $this->envato_api_wrapper->user_items_by_site($this->username); 
     $marketplaces = array(); 
     foreach ($items_by_marketplace as $key) { 
      $marketplaces[] = array(
       'Marketplace' => $key->site, 
       'Items'  => $key->items 
      ); 
     } 
     foreach ($marketplaces as $key) { 
      $items[$key['Marketplace']] = $this->envato_api_wrapper->new_files_from_user($this->username, $key['Marketplace']); 
     } 
     return json_decode(json_encode($items), true); 
    } 

    public function get_all_items() { 
     $items_by_marketplace = $this->envato_api_wrapper->user_items_by_site($this->username); 
     $marketplaces = array(); 
     $items = array(); 
     $item = array(); 
     foreach ($items_by_marketplace as $key) { 
      $marketplaces[] = array(
       'Marketplace' => $key->site, 
       'Items'  => $key->items 
      ); 
     } 
     foreach ($marketplaces as $key) { 
      $items[$key['Marketplace']] = $this->envato_api_wrapper->new_files_from_user($this->username, $key['Marketplace']); 
     } 
     foreach ($items as $main_key) { 
      foreach ($main_key as $secondary_key) { 
       $item[] = array(
        'ID'  => $secondary_key->id, 
        'Item'  => $secondary_key->item, 
        'URL'  => $secondary_key->url, 
        'User'  => $secondary_key->user, 
        'Thumb'  => $secondary_key->thumbnail, 
        'Sales'  => $secondary_key->sales, 
        'Rating' => $secondary_key->rating, 
        'Cost'  => $secondary_key->cost, 
        'Uploaded' => $secondary_key->uploaded_on, 
        'Tags'  => $secondary_key->tags, 
        'Category' => $secondary_key->category, 
        'Preview' => $secondary_key->live_preview_url 
       ); 
      } 
     } 
     return $item; 
    } 

} 

?> 

И я пытаюсь выполнить следующий код в другом файле, на трех уровнях выше, где расположены классы:

<?php 

       require 'assets/class/envato/envato_api_class.php'; 

       $api_key = 'some_key_here'; 

       $username = 'some_username_here'; 

       $envato = new envato_api_class($api_key, $username); 

       $items = $envato->get_all_items(); 

       function rating($cluster) { 
        for ($i = 1; $i <= $cluster; $i++) { 
         echo '<img src="assets/gfx/filled-star.png" alt="Rating" />'; 
        } 
        $empty = 5 - $cluster; 
        if ($empty > 0) { 
         for ($i = 0; $i < $empty; $i++) { 
          echo '<img src="assets/gfx/empty-star.png" alt="Rating" />'; 
         } 
        } 
       } 

       // Adding Rows instead of altogether... 
       $halfway = floor(count($items)/2); 
       $count=0; 

       echo '<div class="item-row">'; 

       foreach ($items as $key) { 

        // Check if we can add the second row 
        if($count==$halfway){ 
         echo '</div><div class="item-row">'; 
        } 
        $count++; 

        echo '<div class="product id-'.$key['ID'].'">'; 
         echo '<div class="description">'; 
          echo '<div class="thumb">'; 
           echo '<i class="icon"><img src="'.$key['Thumb'].'" alt="Thumb"/><span class="preview" data-image-link="'.$key['Preview'].'"><img src="assets/gfx/zoom-icon.png" alt="Zoom"/></span></i>'; 
          echo '</div>'; 
          echo '<div class="info">'; 
           echo '<div class="sales">'; 
            echo '<div class="icon">'; 
             echo '<img src="assets/gfx/sales-icon.png" alt="Sales Icon"/>'; 
            echo '</div>'; 
            echo '<div class="text">'; 
             echo '<p>'.$key['Sales'].'</p>'; 
            echo '</div>'; 
           echo '</div>'; 
           echo '<div class="rating">'; 
            rating($key['Rating']); 
           echo '</div>'; 
          echo '</div>'; 
         echo '</div>'; 

         echo '<div class="purchase">'; 
          echo '<div class="info">'; 
           echo '<i class="icon"><span class="tooltip">$ '.$key['Cost'].'</span></i>'; 
          echo '</div>'; 
          echo '<div class="proceed">'; 
           echo '<a class="button" href="'.$key['URL'].'?ref='.$username.'">Purchase</a>'; 
          echo '</div>'; 
         echo '</div>'; 
        echo '</div>'; 
       } 

       echo '</div>'; // End Item Row 
      ?> 

Но при тестировании на локальном хосте я получаю следующее сообщение об ошибке:

Notice: Undefined property: stdClass::$user-items-by-site in C:\xampp\htdocs\Envato\assets\class\envato\envato_api_wrapper.php on line 233 

Может кто-нибудь сказать мне, почему я получаю эту ошибку? Что я там делаю неправильно?

Answer 1

Вы получаете эту ошибку из-за этой линии (198):

return $this->fetch($url, 'user-items-by-site'); 

В сочетании с линией 233:

$data = isset($set) ? $data->{$set} : $data; // if a set is needed, update 

Вы, видимо, пытается получить доступ к члену, который не существует.

Поскольку данные поступают из удаленного источника и затем анализируются как JSON, мы, вероятно, не можем больше помочь.