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    <p>We've edited quite a bit here already so I'll just post a new answer, hope that's ok. Will leave my old answer up for the sake of it.</p> <p>Anyway, we're starting off from your latest example (<code>Form extends Tag</code>).</p> <p>Seems like you're trying to mimic some kind of <a href="http://en.wikipedia.org/wiki/Builder_pattern" rel="nofollow noreferrer">Builder pattern</a>, so bear with me and let's go with a short example:</p> <pre><code>class TagBuilder { protected $args; protected $className; protected $classLocation; function __construct() { } public function setClass($file, $class) { /* @todo Use reflection maybe to determine if $class is a Tag subclass */ if (file_exists($file)) { require_once $file; // Or use the autoloader } $this-&gt;classLocation = $file; $this-&gt;className = $class; } /** * @return Tag the built tag (or tag subclass) instance */ public function getTag() { $fullyQualifiedClassName = $this-&gt;getFullyQualifiedClassName(); $newTag = new $fullyQualifiedClassName($this-&gt;args); $newTag-&gt;class_location = $this-&gt;classLocation; return $newTag; } protected function getFullyQualifiedClassName() { return $this-&gt;className; } public function setArgs($args) { $this-&gt;args = $args; } } </code></pre> <p>Additionally, you will have to modify the Form constructor to call it's <code>parent::__construct($args)</code> method in order to pass the <code>$args</code> dependency.</p> <p>And then run it with</p> <pre><code>$builder = new TagBuilder(); $builder-&gt;setClass('/library/form/form.php', 'Form'); $builder-&gt;setArgs(array('wahoo', 'ok')); $form = $builder-&gt;getTag(); </code></pre> <p>This is a bit of a long example and it implies changing some of the OP's API, but if I understood the question correctly, then this is the desired behaviour (or part of it) that the OP wants to mimic in his application.</p> <hr> <p><em>Note:</em> I am aware that this isn't a classical example of the Builder pattern and that the <code>getTag</code> method might seem a bit ambiguous to some purists.</p>
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    1. COHey thanks so much for the detailed response. Unfortunately it's not working. Does Form extend Tag or TagBuilder? I believe this solves the problem of instantiating Tag(builder) before Form, but it doesn't solve the `echo $this->class_location` in the constructor of Form.
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    2. COWith `$this->class_location`, being set in Tag or TagBuilder.
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    3. COThe form class is the same as in your example. The whole idea is that instead of carrying around a tag to inherit from, you create a builder and pass it along anywhere it's needed, without having to pass around the information as to how the builder is configured. I might have misunderstood your intent in which case I can remove the answer.
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