Category Archives: Wordpress

Add custom fields under wp general settings

To add custom fields under wordpress general settings without hacking core code use this as example. Of course you can make it better and write some fancy class for doing this.

add_filter('admin_init', 'my_general_settings_register_fields');

function my_general_settings_register_fields()
{
	register_setting('general', 'my_field', 'esc_attr');
	add_settings_field('my_field', '<label for="my_field">'.__('My Field' , 'my_field' ).'</label>' , 'my_general_settings_fields_html', 'general');
}

function my_general_settings_fields_html()
{
	$value = get_option( 'my_field', '' );
	echo '<input type="text" id="my_field" name="my_field" value="' . $value . '" />';
}

WordPress custom menu display

Just a small example of how to build custom menu output in WordPress.

$menu_args		= array('menu' => 'Main menu', 'echo' => 0) ;
$menu_string	= wp_nav_menu($menu_args);
$xml	= new SimpleXMLElement($menu_string);
$out	= false;

foreach ($xml->ul[0] as $li) 
{
	$classes = array('current-page-ancestor', 'current-menu-item', 'current-menu-parent');
	if (strstr($li['class'], 'current-page-ancestor') || 
		strstr($li['class'], 'current-menu-item') || 
		strstr($li['class'], 'current-menu-parent')) 
	{
		$out = $li->ul;      
		$i = 0;
		if (isset($out->li) && !empty($out->li))
		{
			$out['id']		= 'sub_menu';
			$out['class']	= 'clear';
			foreach ($out->li as $li_sub) 
			{      
				if (!strstr($li_sub['class'], 'current-page-ancestor') && 
					!strstr($li_sub['class'], 'current-menu-item') && 
					!strstr($li_sub['class'], 'current-menu-parent')) 
				{
					unset($out->li[$i]->ul);
				}
				$i++;
			}
		}
		break;;
	}
}
if (!empty($out)) {
	 echo $out->asXML(); 
}

Custom columns for custom post type

When using hook “manage_MY_TYPE_NAME_posts_columns” or “manage_MY_TYPE_NAME_posts_custom_column” on WP version >= 3.1 the syntax is little bit changed.

Here’s the example:

add_filter('manage_MY_TYPE_NAME_posts_custom_column', 'my_column_values');
add_filter('manage_MY_TYPE_NAME_posts_columns', 'my_columns');

function my_columns($columns)
{
	$columns['custom_col'] = __('Field name text');
	return $columns;
}

function my_column_values($name, $post_id)
{
	global $post, $typenow;

	// Use $typenow to check custom post type

	switch ($name)
	{
		case 'custom_col':
			echo 'value';
		break;
	}
}

Disable wordpress core updates display

Ever had a situation where you have given admin right to the client?  What usally happens is that client will update the wordpress core. If we are talking about custom solutions, its most definitely not safe to update the core. Here’s a solution for disabling  the opportunity to update WordPress core.

add_action( 'init', create_function( '$a', "remove_action( 'init', 'wp_version_check' );" ), 2 );
add_filter( 'pre_option_update_core', create_function( '$a', "return null;" ) );

# 2.8 to 3.0:
remove_action( 'wp_version_check', 'wp_version_check' );
remove_action( 'admin_init', '_maybe_update_core' );
add_filter( 'pre_transient_update_core', create_function( '$a', "return null;" ) );

# 3.0:
add_filter( 'pre_site_transient_update_core', create_function( '$a', "return null;" ) );

XHTML SEO friendly sample header

Standard solution for developing WordPress header. SEO friendly and can be copied every time new template is created.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" <?php language_attributes(); ?>>
<head profile="http://gmpg.org/xfn/11">
<meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('charset'); ?>" />
<title><?php wp_title('|', true, 'right'); ?> <?php bloginfo('name'); ?></title>
<link rel="pingback" href="<?php bloginfo('pingback_url'); ?>" />
<?php wp_head(); ?>
<link rel="stylesheet" type="text/css" href="<?php bloginfo('stylesheet_directory'); ?>/img/styles.css" media="all" />
<link rel="stylesheet" type="text/css" href="<?php bloginfo('stylesheet_directory'); ?>/img/styles_screen.css" media="screen, projection" />
<link rel="shortcut icon" type="image/ico" href="<?php bloginfo('stylesheet_directory'); ?>/favicon.ico" />
<script type="text/javascript" src="<?php bloginfo('stylesheet_directory'); ?>/js/jquery.js"></script>
<script type="text/javascript" src="<?php bloginfo('stylesheet_directory'); ?>/js/scripts.js"></script>
</head>