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<?php
//--------------------------------------------------------------------------------------------------
// Session-Based Flash Messages v1.0
// Copyright 2012 Mike Everhart (http://mikeeverhart.net)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//------------------------------------------------------------------------------
// Description:
//------------------------------------------------------------------------------
//
// Stores messages in Session data to be easily retrieved later on.
// This class includes four different types of messages:
// - Success
// - Error
// - Warning
// - Information
//
// See README for basic usage instructions, or see samples/index.php for more advanced samples
//
//--------------------------------------------------------------------------------------------------
// Changelog
//--------------------------------------------------------------------------------------------------
//
// 2011-05-15 - v1.0 - Initial Version
//
//--------------------------------------------------------------------------------------------------
class Messages {
//-----------------------------------------------------------------------------------------------
// Class Variables
//-----------------------------------------------------------------------------------------------
var $msgId;
var $msgTypes = array( 'help', 'info', 'warning', 'success', 'error' );
var $msgClass = 'messages';
var $msgWrapper = "<div class='%s %s'><a href='#' class='closeMessage'></a>\n%s</div>\n";
var $msgBefore = '<p>';
var $msgAfter = "</p>\n";
/**
* Constructor
* @author Mike Everhart
*/
public function __construct() {
// Generate a unique ID for this user and session
$this->msgId = md5(uniqid());
// Create the session array if it doesnt already exist
if( !array_key_exists('flash_messages', $_SESSION) ) $_SESSION['flash_messages'] = array();
}
/**
* Add a message to the queue
*
* @author Mike Everhart
*
* @param string $type The type of message to add
* @param string $message The message
* @param string $redirect_to (optional) If set, the user will be redirected to this URL
* @return bool
*
*/
public function add($type, $message, $redirect_to=null) {
if( !isset($_SESSION['flash_messages']) ) return false;
if( !isset($type) || !isset($message[0]) ) return false;
// Replace any shorthand codes with their full version
if( strlen(trim($type)) == 1 ) {
$type = str_replace( array('h', 'i', 'w', 'e', 's'), array('help', 'info', 'warning', 'error', 'success'), $type );
// Backwards compatibility...
} elseif( $type == 'information' ) {
$type = 'info';
}
// Make sure it's a valid message type
if( !in_array($type, $this->msgTypes) ) die('"' . strip_tags($type) . '" is not a valid message type!' );
// If the session array doesn't exist, create it
if( !array_key_exists( $type, $_SESSION['flash_messages'] ) ) $_SESSION['flash_messages'][$type] = array();
$_SESSION['flash_messages'][$type][] = $message;
if( !is_null($redirect_to) ) {
header("Location: $redirect_to");
exit();
}
return true;
}
//-----------------------------------------------------------------------------------------------
// display()
// print queued messages to the screen
//-----------------------------------------------------------------------------------------------
/**
* Display the queued messages
*
* @author Mike Everhart
*
* @param string $type Which messages to display
* @param bool $print True = print the messages on the screen
* @return mixed
*
*/
public function display($type='all', $print=true) {
$messages = '';
$data = '';
if( !isset($_SESSION['flash_messages']) ) return false;
if( $type == 'g' || $type == 'growl' ) {
$this->displayGrowlMessages();
return true;
}
// Print a certain type of message?
if( in_array($type, $this->msgTypes) ) {
foreach( $_SESSION['flash_messages'][$type] as $msg ) {
$messages .= $this->msgBefore . $msg . $this->msgAfter;
}
$data .= sprintf($this->msgWrapper, $this->msgClass, $type, $messages);
// Clear the viewed messages
$this->clear($type);
// Print ALL queued messages
} elseif( $type == 'all' ) {
foreach( $_SESSION['flash_messages'] as $type => $msgArray ) {
$messages = '';
foreach( $msgArray as $msg ) {
$messages .= $this->msgBefore . $msg . $this->msgAfter;
}
$data .= sprintf($this->msgWrapper, $this->msgClass, $type, $messages);
}
// Clear ALL of the messages
$this->clear();
// Invalid Message Type?
} else {
return false;
}
// Print everything to the screen or return the data
if( $print ) {
echo $data;
} else {
return $data;
}
}
/**
* Check to see if there are any queued error messages
*
* @author Mike Everhart
*
* @return bool true = There ARE error messages
* false = There are NOT any error messages
*
*/
public function hasErrors() {
return empty($_SESSION['flash_messages']['error']) ? false : true;
}
/**
* Check to see if there are any ($type) messages queued
*
* @author Mike Everhart
*
* @param string $type The type of messages to check for
* @return bool
*
*/
public function hasMessages($type=null) {
if( !is_null($type) ) {
if( !empty($_SESSION['flash_messages'][$type]) ) return $_SESSION['flash_messages'][$type];
} else {
foreach( $this->msgTypes as $type ) {
if( !empty($_SESSION['flash_messages']) ) return true;
}
}
return false;
}
/**
* Clear messages from the session data
*
* @author Mike Everhart
*
* @param string $type The type of messages to clear
* @return bool
*
*/
public function clear($type='all') {
if( $type == 'all' ) {
unset($_SESSION['flash_messages']);
} else {
unset($_SESSION['flash_messages'][$type]);
}
return true;
}
public function __toString() { return $this->hasMessages(); }
public function __destruct() {
//$this->clear();
}
} // end class
?>
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