global_conditional_notifications.php

<?php

/*
    Plugin Name: Global Conditional Notification 
    Description: Provides global notifications with conditional content
    Version: 1.0
    Author: Chris Knowles
    Plugin URI: http://
    Author URI: http://premium.wpmudev.org/blog/author/chrisdknowles/
    Author: Bas Matthee
    License: Free for use and modification
    
    This is an amlagmation and tweaking of two existing WP plugins:
    Global Notify by Bas Matthee, http://wordpress.org/plugins/global-notifications/
    WordPress Conditional Content by Super Interactive, http://wordpress.org/plugins/wp-conditional-content/
*/

class GlobalNotify {
    
    public function __construct() {
        
        add_action( 'admin_menu', array(&$this,'gn_plugin_menu') );
        add_action( 'loop_start', array(&$this,'gn_show_notification') );
        add_action( 'wp_head', array(&$this,'gn_add_css') );
        
        /* add the shortcodes */
        
        # Base layer
	add_shortcode( 'if', array( &$this, 'gn_short_code_if' ) );

	# Second layer
	add_shortcode( 'if2', array( &$this, 'gn_short_code_if' ) );

	# Third layer
	add_shortcode( 'if3', array( &$this, 'gn_short_code_if' ) );

	# Fourth layer
	add_shortcode( 'if4', array( &$this, 'gn_short_code_if' ) );
        
    }
    
    public function gn_plugin_menu() {
        
        add_menu_page('Global Notify', 'Global Notify', 'manage_options', 'gn_settings', array(&$this,'gn_settings'));
        
    }
    
    public function gn_show_notification() {
              
        if ( $this->gn_is_set('bmgn_notification_enabled') ) {
                
			$class = 'gn-'.get_option('bmgn_notification_type','notify');
		 
			// CK - "unsanitize" the option
			$message = str_replace('\"' , '"' , get_option('bmgn_notification',''));
			
			// CK - run any shortcodes
			$message = apply_filters( 'the_content' , $message );
			
			if ( trim( $message ) != '' ) echo '<div class="gn '.$class.'">'.$message.'</div>';
            
        }
        
    }
    
    public function gn_settings() {
        
    	if ( !current_user_can( 'manage_options' ) )  {
    	   
    		wp_die( __( 'You do not have sufficient permissions to access this page.' ) );
            
    	}
        
        if (isset($_POST['bmgn_notification'])) {
            
            $gn_enabled		= (isset($_POST['bmgn_notification_enabled']))?1:0;
            $gn_type    	= $_POST['bmgn_notification_type'];
            
            update_option('bmgn_notification',$_POST['bmgn_notification']);
            update_option('bmgn_notification_type',$gn_type);
            update_option('bmgn_notification_enabled',$gn_enabled);
            /* CK - added CSS option */
            update_option('bmgn_notification_css',$_POST['bmgn_notification_css']);
            
            echo '
            <div class="updated">
                <p>Changes saved!</p>
            </div>';
            
        }
        
    	echo '
        <div class="wrap">
        
            <form action="" method="post">
            
            <h1>Global Notification - Settings</h1>
            
            <p>
                Enter notification content. HTML tags and shortcodes can be used.
            </p>
            
            <textarea style="width: 80%; height: 300px" name="bmgn_notification">'.str_replace('\"', '"', get_option('bmgn_notification','Enter your message here.')).'</textarea><br />
            <br />
            
            <p>
            	Notification type:
            </p>
            
            <select name="bmgn_notification_type">
                <option value="notify" '.$this->gn_cb_check('notify',get_option('bmgn_notification_type','notify')).'>Notify</option>
                <option value="alert" '.$this->gn_cb_check('alert',get_option('bmgn_notification_type','notify')).'>Alert</option>
                <option value="warning" '.$this->gn_cb_check('warning',get_option('bmgn_notification_type','notify')).'>Warning</option>
                <option value="custom" '.$this->gn_cb_check('custom',get_option('bmgn_notification_type','custom')).'>Custom</option>
            </select><br />
            <br />
            
            <p>
            	Notification is active?
            </p>
            
            <input type="checkbox" name="bmgn_notification_enabled" '.$this->gn_is_enabled().'> Enabled<br />
            
            <p>
                Enter your CSS for the notifications. Leave blank if you are adding the styles to your theme\'s stylesheet.
            </p>
            
            <textarea style="width: 80%; height: 300px" name="bmgn_notification_css">'.get_option('bmgn_notification_css','
.gn {
    width: 80%;
	margin: 20px 30px;
	padding: 8px 35px 8px 14px;
	margin-bottom: 18px;
	-webkit-border-radius: 4px;
	-moz-border-radius: 4px;
	border-radius: 4px;
}

.gn-notify {
	color: #3A87AD;
	background-color: #D9EDF7;
	border: 1px solid #BCE8F1;
}

.gn-alert {
	color: #B94A48;
	background-color: #F2DEDE;
	border: 1px solid #EED3D7;
}

.gn-warning {
	color: #C09853;
	background-color: #FCF8E3;
	border: 1px solid #FBEED5;
}

.gn-custom {

}                        
            ').'</textarea><br />
            <br />
            <br />
            <input style="font-size: 120%" type="submit" value="Save">
            
            </form>
            
        </div>';
        
    }
    
    public function gn_cb_check($val1,$val2) {
        
        return ($val1 == $val2)?'selected="selected"':'';
        
    }
    
    public function gn_is_enabled() {
        
        return (get_option('bmgn_notification_enabled') == 1)?'checked="checked"':'';
        
    }

    public function gn_is_set( $option_name ) {
        
        return (get_option( $option_name ) == 1)?true:false;
        
    }
    
    public function gn_add_css() {
    
    	$css = get_option('bmgn_notification_css','');
    	
    	if ( trim( $css ) != '') echo '<style type="text/css" media="screen">' . $css . '</style>';
    
    }
    
	/**
	 * Conditional Content
	 *
	 */

	/**
	 * The function that is called by when the shortcode is parsed
	 * @param array $atts The attributes of the shortcode
	 * @param string $content The content between the shortcode tags
	 * @return string If conditions are met $content, otherwise nothing.
	 * 
	 */
	public function gn_short_code_if( $atts, $content ) {

		if ( empty( $atts ) )
			return $content;

		$condition_met = false;

		$match = '';

		if ( isset( $atts['match'] ) )
			$match = ( 'contain' == $atts['match'] ) ? 'contain' : 'exact';
		
		foreach ( $atts as $key => $value ) {

			if ( 'qs' == $key )
				$condition_met = $this->condition_query_string( $value, $match );
			
			elseif ( 'referrer' == $key )
				$condition_met = $this->condition_referrer( $value, $match );

			elseif ( 'role' == $key )
				$condition_met = $this->condition_user_role( $value );
			
			// CK - Added
			elseif ( 'page' == $key )
				$condition_met = $this->condition_page_type( $value );

			if( ! $condition_met )
				return '';

		}

		# Run through do_shortcode to allow nesting
		return do_shortcode( $content );

	}

	/**
	 * Returns true if specified query string parameters match specified values
	 * @param array $atts The attributes of the shortcode
	 * @return bool True if conditions are met
	 * 
	 */
	private function condition_query_string( $value, $match ) {

		if( ! strstr( $value, ':' ) )
			return false;
		
		list( $qs_key, $qs_value ) = explode( ':', $value );

		$match = ( empty( $match ) ) ? 'exact' : $match;

		# Check if GET value matches given value
		if ( ! isset( $_GET[ $qs_key ] ) || false === $this->check_value( $_GET[ $qs_key ], $qs_value, $match ) )
			return false;

		return true;

	}

	/**
	 * Returns true if HTTP_REFERER matches (any of) the given string(s)
	 * @param array $atts The attributes of the shortcode
	 * @return bool True if conditions are met
	 * 
	 */
	private function condition_referrer( $referrer, $match ) {

		$match = ( empty( $match ) ) ? 'contain' : $match;

		# Return false if no referrer set
		if ( empty( $_SERVER['HTTP_REFERER'] ) )
			return false;

		# Return wether referrer matches
		if( ! $this->check_value( $_SERVER['HTTP_REFERER'], $referrer, $match ) )
			return false;

		return true;

	}

	/**
	 * Returns true if user is logged in and has (any of) the specified role(s)
	 * @param array $atts The attributes of the shortcode
	 * @return bool True if conditions are met
	 */
	private function condition_user_role( $role ) {

		# If role is empty, a user should not have a role to match
		if ( empty( $role ) && is_user_logged_in() )
			return false;
		
		# If role is not empty, user needs to be logged in
		elseif ( ! is_user_logged_in() )
			return false;

		# Return wether current user role matches 
		if( $this->check_value( $role, $this->get_current_user_role() ) )
			return true;

		return false;

	}


	/** CK - Added
	 * Returns true if page type matches specified types
	 * @param array $atts The attributes of the shortcode (type=page|post|home|archive|search)
	 * @return bool True if conditions are met
	 */
	private function condition_page_type( $page ) {

		# If page is 'home' 
		if ( strpos( $page, 'home') > -1 && is_home() )
			return true;
			
		# If page is 'post' 
		if ( strpos( $page, 'post') > -1 && is_singular( 'post' ) )
			return true;
			
		# If page is 'page' 
		if ( strpos( $page, 'page') > -1 && is_singular( 'page' ) )
			return true;			
			
		# If page is 'archive' 
		if ( strpos( $page, 'archive') > -1 && is_archive() )
			return true;

 		# If page is 'search' 
		if ( strpos( $page, 'search') > -1 && is_search() )
			return true;		

		return false;

	}
	

	/**
	 * Compare value with another value or set of values
	 * @param string $value1 The value to test
	 * @param string $value2 The allowed value(s)
	 * @param string $match Can be exact for exact matches or contain for wildcard
	 * @return bool Returns true if value1 matches value2 
	 */
	private function check_value( $value1, $value2, $match = 'exact' ) {

		# Check if multiple values
		if ( strstr( $value2, ';' ) )
			$allowed_values = explode( ';', $value2 );
		else
			$allowed_values = array( $value2 );

		# loop through available values to check
		foreach ( $allowed_values as $allowed_value ) {

			# Exact match
			if ( 'exact' == $match ) {
				if ( $allowed_value == $value1 )
					return true;
			}
			# String contains string (wildcard)
			elseif ( 'contain' == $match ) {
				if ( strstr( $value1, $allowed_value ) )
					return true;
			}
		}
		
		return false;

	}

	/**
	 * Get the role of the current logged in user
	 *
	 */
	private function get_current_user_role() {

		# Get current user object
		$current_user = wp_get_current_user();

		# Get first available role
		if ( ! empty( $current_user->roles ) )
			return array_shift( $current_user->roles );

		return false;

	}
    
}

$GlobalNotifiy = new GlobalNotify();

?>

Nice! Thanks for leaving my name in the credits.