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POPHP subclass can't access public variable set by parent
 

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    <p>I'm very new to PHP and OOP in general. I'm using codeigniter for a framework, and am currently attempting to build a class 'BuildLinks' that will redirect the user to the correct link based on what URL they landed on. </p> <p>The controller passes the right variables to the class, while the function build_afflink() selects what class to call next based on the var1</p> <p>The controller:</p> <pre><code> function out($var1, $var2) { // redirect to link after parsing data $debug='1'; $params = array('var1'=&gt;$var1, 'var2'=&gt;$var2); $this-&gt;load-&gt;library('BuildLinks', $params); if ($debug=='0'){ $redirect = $this-&gt;buildlinks-&gt;build_afflink(); redirect($redirect, 'location', 301); } else { var_dump($this-&gt;buildlinks-&gt;build_afflink()); } } </code></pre> <p>The class BuildLinks is a work in progress... but it is extended by all of the other sites I need to support. </p> <p>BuildLinks class:</p> <pre><code> class BuildLinks { public $var1; public $var2; public $link; function __construct($params) { //populate up inititial variables from $params array (passed from controller) $this-&gt;var1 = (string)$params['var1']; $this-&gt;var2 = (string)$params['var2']; echo __class__ . ' loaded....' . 'var1: '.$this-&gt;var1 . ' var2: ' .$this-&gt;var2. '&lt;br/&gt;'; } public function get_var1() { return $this-&gt;var1; } public function set_var1($var1) { $this-&gt;var1 = $var1; } public function get_var2() { return $this-&gt;var2; } public function set_var2($var2) { $this-&gt;var2 = $var2; } function build_thelink() { switch ($this-&gt;var1) { case 'amazon': //echo 'Amazon is our vendor.&lt;br&gt;'; $newobj = new Amazon; // Amazon subclass returns the correct affiliate link return $newobj-&gt;affiliate_link(); break; case 'ebay': $newobj = new Ebay; //ebay subclass however, cannot access the public var var1, it returns a null value for $this-&gt;var1 return $newobj-&gt;affiliate_link(); break; } } } </code></pre> <p>Essentially, when I make a new Ebay object, it can't access any of the public variables from the parent class BuildLinks. What am I doing wrong?</p> <p>In this example, I have it construct the initial variables and echo back out some information for debugging.</p> <p><strong>EDIT:</strong> If I change the __construct to read:</p> <pre><code> function __construct($params) { //populate up inititial variables from $params array (passed from controller) $this-&gt;var1 = (string)$params['var1']; $this-&gt;var2 = (string)$params['var2']; echo __class__ . ' loaded....' . 'var1: '.$this-&gt;var1. ' var2: ' .$this-&gt;var2 . '&lt;br/&gt;'; var_dump(get_class_vars(get_class($this))); } </code></pre> <p>Then I get this as an output:</p> <pre><code> BuildLinks loaded....var1: ebay var2: somedata array 'var1' =&gt; null 'var2' =&gt; null 'link' =&gt; null </code></pre> <p>The following works fine:</p> <pre><code>$newobj = new Amazon; return $newobj-&gt;affiliate_link(); </code></pre> <p>This does not, but the classes are almost identical...</p> <pre><code>$newobj = new Ebay; return $newobj-&gt;affiliate_link(); </code></pre> <p>Here is the ebay class:</p> <pre><code> class Ebay extends BuildLinks { private $res; //TODO: language/multiple site support //public $locale; function __construct() { //echo __class__ . ' loaded....' . 'vendor: '.$this-&gt;vendor . ' isbn: ' .$this-&gt;isbn . '&lt;br/&gt;'; } function add_to_cart_button($isbn, $locale) { } function affiliate_link() { $this-&gt;get_info(); return $this-&gt;link; } // Load $this-&gt;api_call() and return Amazon SimpleXML response object, load variables function get_info() { $apicall = $this-&gt;api_call(); //build variables foreach ($apicall-&gt;searchResult-&gt;item as $item) { $this-&gt;link = (string )$item-&gt;viewItemURL; } } // Generate API call and return simplexml object $res function api_call() { //build $apicall here $res = simplexml_load_file($apicall); // Check to see if the request was successful, else print an error if ($res-&gt;ack == "Success") { $this-&gt;res = $res; return $res; } else { echo 'api_call() unsuccessful'; } } } </code></pre>
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    1. UStimelf123
    1. UStimelf123
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    1. COYou haven't shown the definition of the Ebay class - does it definitely extend BuildLinks?
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      1. USPaul Dixon
    2. COAlso, the parent class BuildLinks doesn't appear to have an affiliate_link() method...?
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      1. USPaul Dixon
    3. COYep, the Ebay class extends BuildLinks. You are right, it doesn't have an affiliate_link() method. I call build_thelink() which returns the link from the subclasses. I've edited my post to include my ebay subclass
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      1. UStimelf123
 

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