You can remove the breadcrumb from a Drupal page with this line of code:

This how I do it:

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drupal_set_breadcrumb(array());

• Define mod_mail() (implementing hook_mail() ), this function will prepare the email
• Send the email using drupal_mail()

Define mod_mail()

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/**
 * Implementation of hook_mail.
 */
function mod_mail($key, &$message, $params) {
  switch ($key) {
    case 'basic':
      $message['subject'] = t('Greetings');
      $message['body'] = array(t('I just wanted to say hello!'));
      break;
    case 'advanced':
      $message['subject'] = t('Hello @username', array('@username' => $params['username']));
      $message['body'] = array(t('Thank you for joining @site_name!', array('@site_name' => $params['site_name'])));
      break;
    default:
      ; /* Do nothing */
  }
}

Sending the email

In order to send the email you need to decide on 2 parameters (optionally, a 3rd):

1. The recipent (email address)
2. The key, in this example this would be ‘basic’ or ‘advanced’
3. The $params to pass to mod_mail(), in our example it’s only needed if we are using the key ‘advanced’

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// Basic example ($key = 'basic')
$email = "someone@example.com";
drupal_mail('mod', 'basic', $email, language_default());
 
 
// Advanced example ($key = 'advanced')
$email = "someone@example.com";
$params = array(
  'username' = 'Someone',
  'site_name' = variable_get('site_name'),
);
drupal_mail('mod', 'advanced', $email, language_default(), $params);

c.widget is not a function

Or:

d.widget is not a function

I get this error when I do theming or module development for Drupal. Basically this tells you that the file jquery.ui.widget.js is missing. check the code you were writting and add that file to Drupal like this:

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drupal_add_js('misc/ui/jquery.ui.widget.min.js');

Requirements

Before starting I want you to meet the following requirements in order to follow this tutorial:

• Install and enable the Computed_field module
• Install and enable the Date module (Date API, Date & Date popup)
• Install and enable the Rules module
• Enable the core PHP filter module
• Add a date field to an existing content type (let’s call it field_dob)

For the purpose of this tutorial I created a very simple content type named Candidate with only 2 fields:

• I changed the title from Title to Full name and removed the Body field
• I added a Date field and named it field_dob
  

  Date of birth field - Click to enlarge

Add a computed field

Now let’s add a new field with Age as a label and field_age as a name and Computed as a field type.
In the next screen we will set the field settings:

• Computed Code (PHP):

  $entity_field[0]['value'] = ( time() - strtotime($entity->field_dob[LANGUAGE_NONE][0]['value']) ) / 86400 / 365.25;

• Display Code (PHP):

  $display_output = floor($entity_field_item['value']);

• Data type: Decimal
• Decimal Scale (decimal): 3

Add content and test

Now let’s add a few items and see if it works as we expected, I added a couple of entries and tested:

• Old KADIMI (born on 1 Jan 1990) => Age computed 21
• Young KADIMI (born on 2 Jan 1990) => Age computed 21

Sorting with Views

You may want to use the Views module to accommodate the output to your needs, one of the features of the Views module is that it enable you to sort results.

So what if we wanted to sort our candidates by age, Both KADIMI brothers (Old and Young) are 21 years old but Old is 1 day older that Young, for Drupal they have the same age and the result of the sorting may be inaccurate, actually we already fixed this issue by storing the age as a decimal number with 3 decimal points and displaying it as an integer (by using floor), by looking into the database table field_data_field_age with phpMyAdmin:

• Young KADIMI is 21.570 years old
• Old KADIMI is 21.573 yeas old

Update age

In order to recompute a candidate age we must re-save that candidate node, one way to do this is using Rules and Drupal cron

• Visit /admin/config/workflow/rules/reaction/add to add a rule, give it a descriptive name like “Re-save candidates nodes”
  Set React on event to: Cron maintenance tasks are performed
• Add a new action
  Set Select the action to add to: Execute custom PHP code
  Set the PHP code to:

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  $old = '1 day'; # Content is considered outdated if older than {$old} $type = 'candidate'; # Apply to nodes of type {$type} $count = 20; # Update {$count} nodes per cron $old = strtotime("now - $old");   $nids = db_query_range(' SELECT n.nid FROM {node} n WHERE n.type = :type AND n.created < :old ORDER BY n.created ASC', 0, $count, array(':old' => $old, ":type"=>$type) );   foreach ($nids as $nid){ $node = node_load($nid); node_save($node); }

  Tweak the 3 parameters in a way that suits your needs and that’s it!

Need help?

If  you found this tutorial difficult and couldn’t follow the instructions you can ask for help on the comments section or you can hire me and I will take care of this for you.

By default, Drupal provides Drupal themes coders with a variable $body_classes which contains a list of space separated keywords that you can use to style your page depending on different factors including the user status (logged in or not), the page he is viewing (frontpage, node, page, story…).

Make use of $body_classes on your theme like this

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<body class="<?php print $body_classes; ?>">

Here are a few exmaples of $body_classes for different visitors:

• $body_styles: front not-logged-in page-node no-sidebars
• $body_styles: not-front logged-in page-node node-type-blog no-sidebars

You can easily tell that the first line corresponds to a user not logged in, he is viewing the frontpage, the 2nd line is from a user who is logged in and is probably reading a blog post. Both visitors are viewing a page with no sidebars (the admin of the site decided so)

It’s very easy, using these classes to present things differently depending on what suits your needs (user status, current node type, sidebars)

You can find more about the logic behind this variable one the Drupal API Reference

Add more classes to $body_classes

Now what if you need more than those default classes, you can think of many examples; I – as the administrator of a Drupal site – want a big red banner to remind me to logout if I’m using my administrator account instead of my normal account.

The proper way to this is by using the theme hook template_preprocess_page like this (replace theme_name), we add the function theme_name_preprocess_page to our template.php file, Drupal will automatically run that code and add the new classes that we want:

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<body class="<?php
function theme_name_preprocess_page(&$variables) {
  $body_classes = array($variables['body_classes']);
  // if the user is the admin add the class is_admin
  if ($variables['is_admin']) {
    $body_classes[] = 'is_admin';
  }
  // ... more magic here if you want to add  more classes ...
  $variables['body_classes'] = implode(' ', $body_classes);
}?>">

Now you can add more if clauses to the function to have the classes you need.

The function is self-explaining, it accepts one optional parameter, the number of links to show without counting the previous and next buttons.

It accepts your language

The first, previous, next and last buttons text can be set to anything you want from within the function, you probably don’t want to change the presets, the arrows work just fine and don’t need any translation, but it you want to put something else and if you are making a template that is meant for distribution, I advise that you use the __() function, example:

$first_txt = __('First', 'theme_textdomain');
$previous_txt = __('Previous', 'theme_textdomain');
$last_txt = __('Last', 'theme_textdomain');
$next_txt = __('Next', 'theme_textdomain');

The function

This is the function:

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/**
 * get_paged_navigation displays a paged navigation
 * @param int $number_of_pages_to_show
 * @author Nabil Kadimi
 * @link http://www.kadimi.com/
 */
function get_paged_navigation($number_of_pages_to_show = 10){
	$current_page_number = (int) $GLOBALS['paged'];
	$number_of_pages = (int) $GLOBALS['wp_query']->max_num_pages;
	$first_txt = '«';
	$previous_txt = '‹';
	$next_txt = '›';
	$last_txt = '»';
	if($number_of_pages < 2)
		return true;
	if(!$current_page_number)
		$current_page_number = 1;
 
	$last_head_page_number = ceil($number_of_pages_to_show/2);
	$firt_tail_page_number = $number_of_pages - floor($number_of_pages_to_show/2);
 
	if($current_page_number <= $last_head_page_number)
		$page_first_shown =  1 ;
	else if($current_page_number >= $firt_tail_page_number)
		$page_first_shown = $number_of_pages - $number_of_pages_to_show + 1;
	else
		$page_first_shown = $current_page_number - ceil($number_of_pages_to_show/2) + 1;
 
	// First arrows
	if($page_first_shown != 1){
		echo '<a href="',get_pagenum_link(1), '">', $first_txt, '</a> ';
		echo get_previous_posts_link($previous_txt), ' ';
	}
	// Linked page numbers
	for($i=0; $i < $number_of_pages_to_show && $i<$number_of_pages; $i++)
		echo '<a class="current" href="', get_pagenum_link($page_first_shown + $i), '">', $page_first_shown + $i, '</a> ';
	// Last arrows
	if($page_first_shown + $number_of_pages_to_show < $number_of_pages + 1){
		echo get_next_posts_link($next_txt), ' ';
		echo '<a href="', get_pagenum_link($number_of_pages), '">', $last_txt, '</a> ';
	}
}

Usage

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get_paged_navigation();

With formatting

One more thing, if the pagination will have any formatting surrounding it, you can have a conditional statement so that the formatting doesn’t appear if the pagination is not needed (there is only 1 page), here is an example:

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if($GLOBALS['wp_query']->max_num_pages > 1){
	echo '<div class="navigation">';
	get_paged_navigation();
	echo '</div>';
}