Undefined property | Error when using two classes - php

Question

I'm having the following two classes:
Class 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/*"));
}
}
Class 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;
}
}
?>
And I'm trying to execute the following code in another file, three levels above where the classes are located:
<?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='.$username.'">Purchase</a>';
echo '</div>';
echo '</div>';
echo '</div>';
}
echo '</div>'; // End Item Row
?>
But when testing on localhost I get the following error:
Notice: Undefined property: stdClass::$user-items-by-site in C:\xampp\htdocs\Envato\assets\class\envato\envato_api_wrapper.php on line 233
Can someone tell me why am I getting that error ? What am I doing wrong there ?

Answer 1

You get that error because of this line (198):
return $this->fetch($url, 'user-items-by-site');
In combination with line 233:
$data = isset($set) ? $data->{$set} : $data; // if a set is needed, update
You're apparently trying to access a member that does not exist.
Because the data comes from a remote source and is then parsed as JSON, we probably can't help much more.