new in OOP

[pinxxx]

i just started to read about object-oriented programming using php. i took a code that will print some message but when i tried to open it, it doesn't show anything.. is there something wrong with my code or i just forget something? here's the code from a book.. please help. thanks in advance!

 

<?php

 

/*

* Class name: Form

* Description : A class that creates a simple HTML form

* containing only text input fields. The class has 3 methods.

*/

 

class Form

{

  var $fields=array(); # contains field names and labels

  var $processor; #name of program to process form

  var $submit = "Submit Form"; # value for the submit button

  var $Nfields = 0; # number of fields added to the form

 

/* Constructor: User passes in the name of the name of the script where

*form data is to be sent ($processor) and the value to show on the submit button. 

*/

  function __construct($processor, $submit)

  {

    $this->processor = $processor;

    $this->submit = $submit;

  }

 

/* Display form function. Displays the form.

*/

  function displayForm()

  {

    echo "<form action='$this->processor)' method='post'>";

    echo "<table width='100%'>";

    for($j=1;$j<=sizeof($his->fields);$j++)

    {

      echo "<tr><td align=\"right\">

            {$this->fields[$j-1]['label']}: </td>\n";

      echo "<td>

            <input type='text'

              name='{$this->fields[$j-1]['name']}'>

            </td></tr>\n";

      echo "<tr><td colspan=2 align='center'>

            <input type='submit'

                value='{$this->submit}'></td></tr>\n";

      echo "</table>";

    }

/* Function that adds a field to the form. The user needs to

* send the name of the field and a label to be displayed.

*/

    function addField($name,$label)

    {

      $this->fields[$this->Nfields]['name'] = $name;

      $this->fields[$this->Nfields]['label'] = $label;

      $this->Nfields = $this->Nfields + 1;

    }

  }

 

}

?>

[trq]

Where are you instantiating and actually using this class?

[oni-kun]

Yes, for example you've built the class and now you need to place it into an object!

 

$form = new Form('form.php', 'Submit!'); //Create new object with constructor
$form->addfield('this','that'); //Use a object function
$form->addfield('$date', '$time')
$form->displayForm(); //Use object's class function to display form

 

Code is only an example, but as you see you call the functions within the class, and instantiate it from an object.

[pinxxx]

@thorpe: i just got the code from the book i'm reading and i want to test the output of this code.

 

@oni-kun: thanks for the explanation! i kinda got it. i'll go back to the sample code and i'll try it again. thanks for the help..