add_filter( 'show_admin_bar', '__return_false' );

Small Note: It give similar functions for return true __return_true, return zero __return_zero and return empty array __return_empty_array.

If you like to deactivate the Admin Bar completely, you can use the following syntax and if you want adjust or extend. This example just lets user use the Admin Bar, who have the rights manage_options, in default only the administrator hast the rights.

function fb_show_admin_bar() {

	if ( current_user_can( 'manage_options' ) )
		return TRUE;
	else
		return FALSE;
}
add_filter( 'show_admin_bar', 'fb_show_admin_bar' );

Example Screenshots

The function

Now the function for the pagination

function fb_paging_bar( $args = array() ) {

	$defaults = array(
		'range'           => 4,
		'custom_query'    => FALSE,
		'previous_string' => __( '«««', FB_GREYFOTO_TEXTDOMAIN ),
		'next_string'     => __( '»»»', FB_GREYFOTO_TEXTDOMAIN ),
		'view_fp'         => TRUE,
		'view_lp'         => TRUE,
		'before_output'   => '<div class="postlink">',
		'after_output'    => '</div>'
	);

	$args = wp_parse_args(
		$args,
		apply_filters( 'fb_paging_bar_defaults', $defaults )
	);

	$args['range'] = (int) $args['range'] - 1;
	if ( !$args['custom_query'] )
		$args['custom_query'] = @$GLOBALS['wp_query'];
	$count = (int) $args['custom_query']->max_num_pages;
	$page  = intval( get_query_var( 'paged' ) );
	$ceil  = ceil( $args['range'] / 2 );

	if ( $count <= 1 )
		return FALSE;

	if ( !$page )
		$page = 1;

	if ( $count > $args['range'] ) {
		if ( $page <= $args['range'] ) {
			$min = 1;
			$max = $args['range'] + 1;
		} elseif ( $page >= ($count - $ceil) ) {
			$min = $count - $args['range'];
			$max = $count;
		} elseif ( $page >= $args['range'] && $page < ($count - $ceil) ) {
			$min = $page - $ceil;
			$max = $page + $ceil;
		}
	} else {
		$min = 1;
		$max = $count;
	}

	$echo = '';
	$previous = intval($page) - 1;
	$previous = esc_attr( get_pagenum_link($previous) );
	if ( $previous && (1 != $page) )
		$echo .= '<a href="' . $previous . '" title="' . __( 'previous', FB_GREYFOTO_TEXTDOMAIN) . '">' . $args['previous_string'] . '</a>';
	$firstpage = esc_attr( get_pagenum_link(1) );

	if ( $args['view_fp'] && $firstpage && (1 != $page) )
		$echo .= '<a href="' . $firstpage . '">' . __( 'First', FB_GREYFOTO_TEXTDOMAIN ) . '</a>';

	if ( !empty($min) && !empty($max) ) {
		for( $i = $min; $i <= $max; $i++ ) {
			if ($page == $i) {
				$echo .= '<span class="active">' . str_pad( (int)$i, 2, '0', STR_PAD_LEFT ) . '</span>';
			} else {
				$echo .= sprintf( '<a href="%s">%002d</a>', esc_attr( get_pagenum_link($i) ), $i );
			}
		}
	}

	if ($args['view_lp']) {
		$lastpage = esc_attr( get_pagenum_link($count) );
		if ( $lastpage && ($count != $page) ) {
			$count = str_pad( (int)$count, 2, '0', STR_PAD_LEFT );
			$echo .= '<a href="' . $lastpage . '">' . __( 'Last', FB_GREYFOTO_TEXTDOMAIN ) . '(' . $count . ')' . '</a>';
		}
	}

	$next = intval($page) + 1;
	$next = esc_attr( get_pagenum_link($next) );
	if ($next && ($count != $page) )
		$echo .= '<a href="' . $next . '" title="' . __( 'next', FB_GREYFOTO_TEXTDOMAIN) . '">' . $args['next_string'] . '</a>';

	if ( isset($echo) )
		echo $args['before_output'] . $echo . $args['after_output'];
}

For use the function inside the templates use the follow syntax:

<?php if ( function_exists('fb_paging_bar') ) fb_paging_bar(); ?>

Example for custom arguments

For custom arguments, please use the filter. Also an example for this solution.

function change_fb_paging_bar_defaults($args) {

	$args['previous_string'] = ''; // empty string
	$args['next_string'] = '';

	return $args;
}
add_filter('fb_paging_bar_defaults', 'change_fb_paging_bar_defaults');

print('<pre>');
print_r( @get_defined_constants() );
print('</pre>');

To be sure, that only logged in user can see the list, I will add an additional query to check if the user is logged in.

if ( is_user_logged_in() ) {
	print('<pre>');
	print_r( @get_defined_constants() );
	print('</pre>');
}

The output can also be checked by user rights with if ( current_user_can('manage_options') ) {. You can read more about it in a previous article or an article with examples for use the rights.

As an alternativ, the Plugins WP System Health and Debug Objects can be very helpful, which lists all constants.
Have fun!

The Admin Bar is in backend and frontend available and makes a fast access to backend areas possible. This advantage applies also to the Debug Bar.

However, it might not be enough for you and you need some additional custom data with the attachment, whether in order to control something in the backend of WordPress, or even display the data in the front end to the image. So here is a small tutorial how to add an additional field. You can use this solution directly and adding a new field with the help of a Plugin.

For the output of the data I present a simple method that can be adjusted accordingly. To read the data, which is assigned to the attachment, there are many functions provided by WordPress and enables you to realize so many amazing things - depending on knowledge and skills of the developer - such as related articles.

The above screenshot shows what we are aim for. An additional field with the name Example Custom Field, also an input field and a description below the field.

Add the Custom Field

First we create a function, which outputs the 3 new fields in the attachment area. These fields are getting delivered in an array and then via the according hook attachment_fields_to_edit integrated in WordPress.

// Add a custom field to an attachment in WordPress
function fb_attachment_fields_edit($form_fields, $post) {

	$form_fields['custom_example']['label'] = __( 'Example Custom Field', FB_AAF_TEXTDOMAIN );
	$form_fields['custom_example']['value'] = get_post_meta($post->ID, '_custom_example', true);
	$form_fields['custom_example']['helps'] = __( 'A helpful text for this field.', FB_AAF_TEXTDOMAIN );

	return $form_fields;
}

Save the custom values

Now that we have completed the data fields, we must take care about saving the values. For this case WordPress provides the hook attachment_fields_to_save, so that you only need to hook in the memory function.

// save custom field to post_meta
function fb_attachment_fields_save($post, $attachment) {

	if ( isset($attachment['custom_example']) )
		update_post_meta($post['ID'], '_custom_example', $attachment['custom_example']);

	return $post;
}

Hook to work in WordPress

The two functions, explained before, providing the necessary functions and now we are going to integrate it into WordPress. Here a short explanation with the help of these two filter hooks. In both cases, our functions passing two parameters to the hooks of WordPress and they are passed with the default value of priority 10. Everything goes through one filter in WordPress and therefore to hook on the respective Filter-Hook (add_filter) attachment_fields_to_*. The transfer via array array(&$this, ... takes place here only because everything is used in connection within a class.

add_filter( 'attachment_fields_to_edit', array(&$this, 'fb_attachment_fields_edit'), 10, 2);
add_filter( 'attachment_fields_to_save', array(&$this, 'fb_attachment_fields_save'), 10, 2);

The Example Plugin

Now we incorporate the functions and their hooks in a Plugin and we can simple use the additional functions inside of WordPress. I think the separation of additional functions in Theme and Plugin is very important because the priority of integration is different and because from my point of view function expansions in a Theme are useful only if they are just additional functions for the Theme and not for WordPress.
Also the use via class is useful, because of a cleaner code. But there are enough articles about the benefits of object-oriented programming and the usage of classes.

<?php
/**
 * @package Add Attachment Fields
 * @author Frank Bültge
 */

/*
Plugin Name: Add Attachment Fields
Plugin URI: http://bueltge.de/
Text Domain: add_attachment_fields
Domain Path: /languages
Description: Example for add a custom field to an attachment in WordPress
Author: Frank Bültge
Version: 0.0.1
Author URI: http://bueltge.de/
Donate URI: http://bueltge.de/wunschliste/
License: GPL
Last change: 24.11.2010 10:21:19
*/ 

/**
License:
==============================================================================
Copyright 2009/2010 Frank Bueltge  (email : frank@bueltge.de)

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

Requirements:
==============================================================================
This plugin requires WordPress >= 2.7 and tested with PHP Interpreter >= 5.2.9
*/

//avoid direct calls to this file, because now WP core and framework has been used
if ( !function_exists('add_action') ) {
	header('Status: 403 Forbidden');
	header('HTTP/1.1 403 Forbidden');
	exit();
} elseif ( version_compare(phpversion(), '5.0.0', '<') ) {
	$exit_msg = 'The plugin require PHP 5 or higher';
	header('Status: 403 Forbidden');
	header('HTTP/1.1 403 Forbidden');
	exit($exit_msg);
}

if ( !class_exists('add_attachment_fields') ) {

	//WordPress definitions
	if ( !defined('WP_CONTENT_URL') )
		define('WP_CONTENT_URL', get_option('siteurl') . '/wp-content');
	if ( !defined('WP_CONTENT_DIR') )
		define('WP_CONTENT_DIR', ABSPATH . 'wp-content');
	if ( !defined('WP_PLUGIN_URL') )
		define('WP_PLUGIN_URL', WP_CONTENT_URL.'/plugins');
	if ( !defined('WP_PLUGIN_DIR') )
		define('WP_PLUGIN_DIR', WP_CONTENT_DIR.'/plugins');
	if ( !defined('PLUGINDIR') )
		define( 'PLUGINDIR', 'wp-content/plugins' ); // Relative to ABSPATH.  For back compat.
	if ( !defined('WP_LANG_DIR') )
		define('WP_LANG_DIR', WP_CONTENT_DIR . '/languages');

	// plugin definitions
	define( 'FB_AAF_BASENAME', plugin_basename(__FILE__) );
	define( 'FB_AAF_BASEDIR', dirname( plugin_basename(__FILE__) ) );
	define( 'FB_AAF_TEXTDOMAIN', 'add_attachment_fields' );

	class add_attachment_fields {

		function __construct() {

			if ( !is_admin() )
				return FALSE;

			add_action( 'init', array(&$this, 'text_domain') );
			add_filter( 'attachment_fields_to_edit', array(&$this, 'fb_attachment_fields_edit'), 10, 2);
			add_filter( 'attachment_fields_to_save', array(&$this, 'fb_attachment_fields_save'), 10, 2);
		}

		function text_domain() {

			load_plugin_textdomain( FB_AAF_TEXTDOMAIN, false, FB_AAF_BASEDIR . '/languages' );
		}

		// Add a custom field to an attachment in WordPress
		function fb_attachment_fields_edit($form_fields, $post) {

			$form_fields['custom_example']['label'] = __( 'Example Custom Field', FB_AAF_TEXTDOMAIN );
			$form_fields['custom_example']['value'] = get_post_meta($post->ID, '_custom_example', true);
			$form_fields['custom_example']['helps'] = __( 'A helpful text for this field.', FB_AAF_TEXTDOMAIN );

			return $form_fields;
		}

		// save custom field to post_meta
		function fb_attachment_fields_save($post, $attachment) {

			if ( isset($attachment['custom_example']) )
				update_post_meta($post['ID'], '_custom_example', $attachment['custom_example']);

			return $post;
		}

	}

	function add_attachment_fields_start() {

		new add_attachment_fields();
	}

	add_action( 'plugins_loaded', 'add_attachment_fields_start' );
}
?>

Example to use the values on Frontend or Plugins

Additional to the Plugin, I have a small solution to output the meta data of the attachment. But I also recommend to read the previously mentioned article, as you can get far more information there.

$attachments = get_children( array(
		'post_parent'    => get_the_ID(),
		'post_type'      => 'attachment',
		'numberposts'    => 1, // show all -1
		'post_status'    => 'inherit',
		'post_mime_type' => 'image',
		'order'          => 'ASC',
		'orderby'        => 'menu_order ASC'
	) );
foreach ( $attachments as $attachment_id => $attachment ) {
	echo get_post_meta($attachment_id, '_custom_example', true);
}

A practical example - photographer and its URL - has been recently posted by Thomas Scholz on WordPress Answers. A nice usage for this possibility.

Today a small snippet, which I frequently use in my WordPress Widgets. It is about the determination of minimum and maximum values. Here is a piece of code from the WordPress Widget Recent Comments:

if ( !$number = (int) $instance['number'] )
    $number = 10;
else if ( $number < 1 )
    $number = 1;
else if ( $number > 15 )
    $number = 15;

With the usage of the mathematical functions min() and max() we can do it in one line:

$number = isset ( $instance['number'] ) ? min ( max ( 1, ( int ) $instance['number'] ), 15 ) : 10;

Change Logo

In the first code example I include the favicon, a fast and simple way. Alternatively you can include a logo of your Theme, therefore the 2nd code example. Each of the following example belongs into the functions.php of the Themes.

function fb_custom_login_logo() {
	$style = '<style type="text/css"> h1 a { background: transparent url(' . get_bloginfo('url') . '/favicon.ico) no-repeat 30px center !important; } </style>';
	echo $style;
}
add_action( 'login_head', 'fb_custom_login_logo' );

function fb_custom_login_logo() {
	$style = '<style type="text/css"> h1 a { background: transparent url(' . get_bloginfo('template_directory') . '/images/your-logo-image.png) no-repeat center top !important; } </style>';
	echo $style;
}
add_action( 'login_head', 'fb_custom_login_logo' );

Now we adjusted the logo, but the name at the hover effect is still not the one we want. Therefore is a hook available.

Change name

We correspond with the hook and deliver with the following code snippet the name of the blog, which lies in the database. Alternatively you can query static content or your own fields.

function fb_login_headertitle() {
	$name = get_option('blogname');
	echo $name;
}
add_filter( 'login_headertitle', 'fb_login_headertitle' );

Change link

Now we want to adjust the link, so a klick on the logo will send us to the frontend of the website. And again, there is a hook available.

function fb_login_headerurl() {
	$url = bloginfo('url');
	echo $url;
}
add_filter( 'login_headerurl', 'fb_login_headerurl' );

Three simple possibilities which should belong in almost every Theme. So that the login page perfectly fits to the website. It looks more professional and your customer will be thankful.

Some theme authors wanted more defined formats - they wanted the feature "post formats". This new functionality will be available in WordPress 3.1 and displays an additional meta-information. The Codex for this functionality is available already, and now it's up to the theme authors to use this new feature.

To use this function, you have to activate it with the Theme. This is controlled, similar to other theme features since version 3.0, over a function. The following syntax gives some of the possible post formats and these can then be used directly on the article, as the following screenshot shows.

add_theme_support( 'post-formats', array( 'aside', 'audio', 'image', 'video' ) );

Just put the code into your functions.php of your Themes.

As possible keys are the following values available.

• default
• aside
• chat
• gallery
• link
• image
• quote
• status
• video
• audio

Like in thumblr you can design the according article. Via the defined values you can use this across themes. The format will be output with the function body_class() for instant, which creates a class, which you can access via CSS. An exmaple for the value Aside of the post format.

<body class="single single-post postid-52 single-format-aside">

Alternatively there are conditional tags and functions to get to the assigned type:

 echo get_post_format();

As so often depends the creativity and usage on the developer. The biggest benefit is probably that defined values exist and as a theme author you can respond to these formats and as a developer you don't have to create a new meta box.

Update: The UI received an update, see Andrew's comment:

What does it mean exactly?

Especially in Germany we have the tradition of an Advent Calendar. An Advent calendar is a special calendar which is used to count down the days from December the 1st until Christmas Eve, December 24th.

An Advent Calendar has 24 doors, one of which is opened every day during Advent. Each door opens to reveal something, such as a toy or a chocolate item.

At WP Engineer, we thought we should do the same and open a door every day, which contains a little gift for our readers, by providing them a WordPress tip or trick each day. So we hope you will be exciting to see what tip, hack or news will be behind the door the next morning. Enjoy a new little WordPress gift every day until December 24th.

Sign up on our RSS Feed or follow us on Twitter, so you won't miss it when we open a new advent door every day!

$_F=__FILE__;$_X='Pz4JPGQ0diA0ZD0iZjIydDVyIj4NCgkJPHAgY(....)
==';eval(base64_decode('JF9YPW(...)Ow=='));

I have decoded the footer and it was "only" the original footer with two additional links to spam sites, together with the associated keywords. It could have been also some harmful code that makes it possible to break into your blog for example. What exactly the code is, that is not seen for a person without profound coding expertise.

Imagine that it is possible to break into the blog, or potentially damage the entire web space of the server. I wouldn't like to pay the invoice of your provider for the damage and surely don't want to lose my whole website and files. And all this because you wanted to save $59!

If you want to have a special theme, buy it! The theme developer also provide support within the $59, also many developer help with customization, updates and much more. A pretty good deal in my opinion.

So take the advice and rather buy a premium theme than download it for "free" somewhere else. The same applies also for premium Plugins.