The previous step: defining form element classes in PHP4 - PHP

In this fourth part of the series covering the Singleton and Factory Design Patterns in PHP, we will discuss issues stemming from the fact that PHP 4 does not have an abstract class. Since we found it useful in the previous article to define the form element factory class as an abstract class, in this article we will discuss the process for making the form element factory class a Singleton, and how this serves our purposes.

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By: Alejandro Gervasio

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November 30, 2005

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Before working with the Singleton model of the form element factory, it’s best to define all of the form element classes, suitable for use in PHP4. Since they’re closely similar to their counterparts in PHP5, this shouldn’t present any difficulties. Here they are:

// class textinput
class textinput{
    var $html;
    function textinput($attributes=array()){
        if(count($attributes)<1){
            trigger_error('Invalid number of
attributes');
exit();
        }
        $this->html='<input type="text" ';
        foreach($attributes as $attribute=>$value){
            $this->html.=$attribute.'="'.$value.'" ';
        }
        $this->html.='/>';
    }
    function getHTML(){
        return $this->html;
    }
}
// class password input
class passwordinput{
    var $html;
    function passwordinput($attributes=array()){
        if(count($attributes)<1){
            trigger_error('Invalid number of
attributes');
exit();
        }
        $this->html='<input type="text" ';
        foreach($attributes as
$attribute=>$value){
            $this->html.=$attribute.'="'.$value.'" ';
        }
        $this->html.='/>';
    }
    function getHTML(){
        return $this->html;
    }
}
// class hidden input
class hiddeninput{
    var $html;
    function textinput($attributes=array()){
        if(count($attributes)<1){
            trigger_error('Invalid number of
attributes');
exit();
        }
        $this->html='<input type="hidden" ';
        foreach($attributes as $attribute=>$value){
            $this->html.=$attribute.'="'.$value.'" ';
        }
        $this->html.='/>';
    }
    function getHTML(){
        return $this->html;
    }
}
// class file input
class fileinput{
    var $html;
    function fileinput($attributes=array()){
        if(count($attributes)<1){
            trigger_error('Invalid number of
attributes');
exit();
        }
        $this->html='<input type="file" ';
        foreach($attributes as
$attribute=>$value){
            $this->html.=$attribute.'="'.$value.'" ';
        }
        $this->html.='/>';
    }
    function getHTML(){
        return $this->html;
    }
}
// class image input
class imageinput{
    var $html;
    function imageinput($attributes=array()){
        if(count($attributes)<1){
            trigger_error('Invalid number of
attributes');
exit();
        }
        $this->html='<input type="image" ';
        foreach($attributes as
$attribute=>$value){
            $this->html.=$attribute.'="'.$value.'" ';
        }
        $this->html.='/>';
    }
    function getHTML(){
        return $this->html;
    }
}
// class radio button
class radiobutton{
    var $html;
    function radiobutton($attributes=array()){
        if(count($attributes)<1){
            trigger_error('Invalid number of
attributes');
            exit();
        }
        $this->html='<input type="radio" ';
        foreach($attributes as $attribute=>$value){
            $this->html.=$attribute.'="'.$value.'" ';
        }
        $this->html.='/>';
    }
    function getHTML(){
        return $this->html;
    }
}
// class check box
class checkbox{
    var $html;
    function checkbox($attributes=array()){
        if(count($attributes)<1){
            trigger_error('Invalid number of
attributes');
exit();
        }
        $this->html='<input type="checkbox" ';
        foreach($attributes as
$attribute=>$value){
            $this->html.=$attribute.'="'.$value.'" ';
        }
        $this->html.='/>';
    }
    function getHTML(){
        return $this->html;
    }
}

All right, let’s pause for a moment and relax. At this point, most of the form element classes has been listed, so the walk through the source code is almost finished. There are a few more classes to be defined yet, so keep reading.

Next: Ending up the coding round: defining the remaining form element classes >>