Drupal 6 Template

Example from wysiwyg module

/**
* Implementation of hook_theme().
*
* @see drupal_common_theme(), common.inc
* @see template_preprocess_page(), theme.inc
*/
function wysiwyg_theme() {
return array(
'wysiwyg_profile_overview' => array(
'arguments' => array('form' => NULL),
),
'wysiwyg_admin_button_table' => array(
'arguments' => array('form' => NULL),
),
'wysiwyg_dialog_page' => array(
'arguments' => array('content' => NULL, 'show_messages' => TRUE),
'file' => 'wysiwyg.dialog.inc',
'template' => 'wysiwyg-dialog-page',
),
);
}

in wysiwyg.dialog.inc

echo theme('wysiwyg_dialog_page', $callback($instance));


/**
* Template preprocess function for theme_wysiwyg_dialog_page().
*
* @see wysiwyg_dialog()
* @see wysiwyg-dialog-page.tpl.php
* @see template_preprocess()
*/
function template_preprocess_wysiwyg_dialog_page(&$variables) {
// Construct page title
$head_title = array(strip_tags(drupal_get_title()), variable_get('site_name', 'Drupal'));
//code process here
}

in file wysiwyg-dialog-page.tpl.php
you can ouput any variable processed in template function
example


This make you able to customize layout for any page, menu on your site
cheer

How to extend a form in Drupal

It's so easy to extend a exists form in drupal,

we just use hook_form_alter to do that

function example_form_alter(&$form, &$form_state, $form_id) {

if ( $form_id == 'user_register_form') {

$form['js_example_form']['fullname'] = array(

'#type' => 'textfield',

'#title' => t('Full Name'),

'#element_validate' => array('example_fullname_validate'),

);

$form['#submit'][] = 'example_fullname_submit';
//$form['#validate'][] = 'example_fullname_validate';

}

}

Create a method for validate new form element value

function example_fullname_validate($form, &$form_state) {
$fullname = $form_state['values']['fullname'];
if (empty($fullname)) {
form_set_error('fullname', 'Fullname can not be empty.');
}
}

Save value of fullname

function example_fullname_submit($form, &$form_state) {
$fullname = $form_state['values']['fullname'];
//save fullname here
}

http://www.chromaticsites.com/blog/drupal-tutorial-form-overrides-and-element-specific-validations/

How to create your own hook in drupal

Today I will show you how you can create your own module hook in drupal 7 that is so easy to do
First you must create a api file for the module which you wanna create a hook

YOUR_MODULE_NAME.api.php

create hook method in this file

function hook_YOUR_MODULE_NAME_item_update($item) {

//nothing defined here

}

then in your module file create a method which update data for item

YOUR_MODULE_NAME.module

function YOUR_MODULE_NAME_item_update() {

//your code to update

module_invoke_all('MODULE_NAME_item_update', $item);

}

in orther module you can create function to implement this method

NEW_MODULE.module

function NEW_MODULE_item_update($item) {

//do something with item

}