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This is a very simple class that will allow your scripts to log to a file, i will also show how to extend this class so that you can have multiple data sources.
This class is using a singleton pattern at the moment, this is done so that no more than one instance of this class can be instanciated at any time.
| <?php
final class Logger {
private static $_instance;
private function __construct() {
}
static function instance() {
if (!isset(self::$_instance)) {
$c = __CLASS__;
self::$_instance = new $c;
}
return self::$_instance;
}
// Prevent users to clone the instance
public function __clone() {
throw new Exception('Cannot clone the logger object.');
}
public function log($message = '') {
$filename = BASE_PATH.'/log.txt';
$file = fopen($filename, 'a+');
fwrite($file, $message."\r\n");
fclose($file);
}
}
?> | |
to use this you would do something like the following
| <?php
include_once('Logger.php');
Logger::instance()->log('your message here');
?> | |
Now what if you wanted to be able to store the stuff in the database? You could easilly extend the class as such
| <?php
abstract class Logger {
public function __construct() {
}
abstract function log($message = '') {
}
}
class FileLogger extends Logger {
public function __construct() {
}
public function log($message = '') {
$filename = BASE_PATH.'/log.txt';
$file = fopen($filename, 'a+');
fwrite($file, $message."\r\n");
fclose($file);
}
}
class DatabaseLogger extends Logger {
private $_db;
public function __construct($db = NULL) {
if($db instanceof Database) $this->_db = $db;
else throw new Exception(__METHOD__ . ' requires an object of type Database');
}
public function log($message = NULL) {
if(!is_null($message) && $message != '') $this->_db->Query("INSERT INTO log (message) VALUES('".$message."')");
}
}
?> | |
Now when you want to use this you would do something like the following example
| <?php
$log = new FileLogger();
$log->log('Writing to a file');
$log = new DatabaseLogger($db_obj);
$log->log('Writing to the database.');
$log = null;
?> | |
I hope this example has helped people :) I know it's simple but i mainly submitted it to show how to easilly extend objects in PHP5 I have one more that i will submit that may show a better example ;)
Enjoy. |
|
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