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POOOP: Problem accessing parent's property from the extended child
 

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  1. POOOP: Problem accessing parent's property from the extended child
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    <p>I try to access the parent's property from its extended child similar to the concept below,</p> <pre><code>class Base { protected static $me; protected static $var_parent_1; protected static $var_parent_2; public function __construct ($var_parent_1 = null) { $this-&gt;var_parent_1 = $var_parent_1; $this-&gt;me = 'the base'; } public function who() { echo $this-&gt;me; } public function parent_1() { echo $this-&gt;var_parent_1; } } class Child extends Base { protected static $me; protected static $var_child_1; protected static $var_child_2; public function __construct ($var_child_1 = null) { parent::__construct(); $this-&gt;var_child_1 = $var_child_1; $this-&gt;me = 'the child extends '.parent::$me; } // until PHP 5.3, will need to redeclare this public function who() { echo $this-&gt;me; } public function child_1() { echo $this-&gt;var_child_1; } } $objA = new Base($var_parent_1 = 'parent var 1'); $objA-&gt;parent_1(); // "parent var 1" $objA-&gt;who(); // "the base" $objB = new Child($var_child_1 = 'child var 1'); $objB-&gt;child_1(); // "child var 1" $objB-&gt;who(); // should get "the child extends the base" </code></pre> <p>But I get <strong>"the child extends"</strong> instead of <strong>"the child extends the base"</strong> if I use <code>$this-&gt;</code> </p> <p>It seems OK if I change all <code>$this-&gt;</code> to <code>self::</code></p> <p>Why?</p> <p>Is that the only proper way to access the parent's property which is to change all <code>$this-&gt;</code> to <code>self::</code>?</p> <p><strong>EDIT:</strong></p> <p>I removed all <code>static</code> keywords,</p> <pre><code>class Base { protected $me; protected $var_parent_1; protected $var_parent_2; public function __construct ($var_parent_1 = null) { $this-&gt;var_parent_1 = $var_parent_1; $this-&gt;me = 'the base'; } public function who() { echo $this-&gt;me; } public function parent_1() { echo $this-&gt;var_parent_1; } } class Child extends Base { protected $me; protected $var_child_1; protected $var_child_2; public function __construct ($var_child_1 = null) { parent::__construct(); $this-&gt;var_child_1 = $var_child_1; $this-&gt;me = 'the child extends '.parent::$me; } // until PHP 5.3, will need to redeclare this public function who() { echo $this-&gt;me; } public function child_1() { echo $this-&gt;var_child_1; } } $objA = new Base($var_parent_1 = 'parent var 1'); //$objA-&gt;parent_1(); // "parent var 1" //$objA-&gt;who(); // "the base" $objB = new Child($var_child_1 = 'child var 1'); $objB-&gt;child_1(); // "child var 1" $objB-&gt;who(); // "the child extends the base" </code></pre> <p>Then I get this error <code>Fatal error: Access to undeclared static property: Base::$me in C:\wamp\www\test\2011\php\inheritence.php on line 109</code> which refers to this line,</p> <pre><code>$this-&gt;me = 'the child extends '.parent::$me; </code></pre>
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    1. COAre you sure you want those to be `static`?
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    2. COnot sure... I actually copied and modified an answer sample from this http://stackoverflow.com/questions/831555/php-child-class-accessing-parent-variable-problem
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