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<?php

/**
 * @see Zend_Form
 */
require_once 'Zend/Form.php';

/**
 * Proof of concept: dynamically adding elements to a Zend_Form
 */
class Code_Form_Dynamic extends Zend_Form {

  public function init() {

    $this->addElement('hidden', 'id', array(
      'value' => 1
    ));

    $this->addElement('text', 'name', array(
      'required' => true,
      'label'    => 'Name',
      'order'    => 2,
    ));

    $this->addElement('button', 'addElement', array(
      'label' => 'Add',
      'order' => 91
    ));

    $this->addElement('button', 'removeElement', array(
      'label' => 'Remove',
      'order' => 92
    ));

    // Submit
    $this->addElement('submit', 'submit', array(
      'label' => 'Submit',
      'order' => 93
    ));
  }

  /**
   * After post, pre validation hook
   *
   * Finds all fields where name includes 'newName' and uses addNewField to add
   * them to the form object
   *
   * @param array $data $_GET or $_POST
   */
  public function preValidation(array $data) {

    // array_filter callback
    function findFields($field) {
      // return field names that include 'newName'
      if (strpos($field, 'newName') !== false) {
        return $field;
      }
    }

    // Search $data for dynamically added fields using findFields callback
    $newFields = array_filter(array_keys($data), 'findFields');

    foreach ($newFields as $fieldName) {
      // strip the id number off of the field name and use it to set new order
      $order = ltrim($fieldName, 'newName') + 2;
      $this->addNewField($fieldName, $data[$fieldName], $order);
    }
  }

  /**
   * Adds new fields to form
   *
   * @param string $name
   * @param string $value
   * @param int    $order
   */
  public function addNewField($name, $value, $order) {

    $this->addElement('text', $name, array(
      'required'       => true,
      'label'          => 'Name',
      'value'          => $value,
      'order'          => $order
    ));
  }
}