More web page objects ahead: defining the remaining (X)HTML widget classes - PHP

As I said before, there are still a few more (X)HTML classes that need to be defined, in order to get all the web page objects complete. That said, here’s the signature of the remaining (X)HTML widgets:

// class Paragraph
class Paragraph extends HTMLElement{
    private $output='<p ';
    private $data;
    private $attributes=array();
    public function __construct($attributes=array()){
        $this->attributes=$attributes;
    }
    public function setData($data){
        if(!$data){
            throw new Exception('Data must not be empty');
        }
        $this->data=$data;
    }
    public function getHTML(){
        foreach($this->attributes as $attribute=>$value){
            $this->output.=$attribute.'="'.$value.'" ';
        }
        $this->output=substr_replace($this->output,'>',-1);
        $this->output.=($this->data instanceof HTMLElement)?
$this->data->getHTML():$this->data;
        $this->output.='</p>';
        return $this->output;
    }
}
// class HTMLlist
class HTMLlist extends HTMLElement{
    private $output='<ul ';
    private $data=array();
    private $attributes=array();
    public function __construct($attributes=array()){
        $this->attributes=$attributes;
    }
    public function setData($data=array()){
        if(count($data)<1){
            throw new Exception('Data must not be empty');
        }
        $this->data=$data;
    }
    public function getHTML(){
        foreach($this->attributes as $attribute=>$value){
            $this->output.=$attribute.'="'.$value.'" ';
        }
        $this->output=substr_replace($this->output,'>',-1);
        foreach($this->data as $data){
            $data=($data instanceof HTMLElement)?$data->getHTML
():$data;
            $this->output.='<li>'.$data.'</li>';
        }
        $this->output.='</ul>';
        return $this->output;
    }
}
// class Form
class Form extends HTMLElement{
    private $output='<form ';
    private $data;
    private $fields=array();
    private $attributes=array();
    public function __construct($attributes=array()){
        $this->attributes=$attributes;
    }
    // set form data
    public function setData($data){
        if(!$data){
            throw new Exception('Data must not be empty');
        }
        $this->data=$data;
    }
    // add <input> element
    public function addInputField($fieldAttributes=array
(),$inputPart=''){
        $fieldOutput=$inputPart.'<input ';
        foreach($fieldAttributes as $attribute=>$value){
            $fieldOutput.=$attribute.'="'.$value.'" ';
        }
        $this->fields[]=$fieldOutput.'/>';
    }
    // add <textarea> element
    public function addTextArea($fieldAttributes=array
(),$inputPart=''){
        $fieldOutput=$inputPart.'<textarea ';
        foreach($fieldAttributes as $attribute=>$value){
            $fieldOutput.=$attribute.'="'.$value.'" ';
        }
        $fieldOutput=substr_replace($fieldOutput,'>',-1);
        $this->fields[]=$fieldOutput.'</textarea>';
    }
    // add <select> element
    public function addSelectField($fieldAttributes=array
(),$options=array(),$inputPart=''){
        $fieldOutput=$inputPart.'<select ';
        foreach($fieldAttributes as $attribute=>$value){
            $fieldOutput.=$attribute.'="'.$value.'" ';
        }
        $fieldOutput=substr_replace($fieldOutput,'>',-1);
        foreach($options as $option=>$value){
            $fieldOutput.='<option
value="'.$value.'">'.$option.'</option>';
        }
        $this->fields[]=$fieldOutput.'</select>';
    }
    public function getHTML(){
        foreach($this->attributes as $attribute=>$value){
            $this->output.=$attribute.'="'.$value.'" ';
        }
        $this->output=substr_replace($this->output,'>',-1);
        $this->output.=($this->data instanceof HTMLElement)?
$this->data->getHTML():$this->data;
        foreach($this->fields as $field){
            $this->output.=$field;
        }
        $this->output.='</form>';
        return $this->output;
    }
}

Fine, I think these are all the (X)HTML widget classes required for constructing a decent mechanism, which uses PHP objects for creating web pages. However, so far I didn’t mention or even code a HTTP compression class anywhere, thus…how does data compression fit into the picture? In response to that, what I’ll do next is define a couple of additional classes that integrate all the prior (X)HTML widgets and apply HTTP compression to dynamically-generated web documents. To learn how this is achieved, please read the following section.