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<?php
// All EasyGiant code 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 3 of the License, or (at your option) any later version.
// See COPYRIGHT.txt and LICENSE.txt.
if (!defined('EG')) die('Direct access not allowed!');
//class to manage a file di log
//this is a singleton class
class Files_Log
{
const DS = DIRECTORY_SEPARATOR;
// array of instances of the class
//key: name of the instance, value:instance. The name of the instance is also the name of the log file to open
private static $instance = array();
public static $logFolder = './'; //the log folder
public static $logExtension = '.log'; //the extension of the log files
public static $logPermission = 0777;
private $splFile; //SplFileObject
//$fileName: the file to open
private function __construct($fileName)
{
$finalChar = self::$logFolder[strlen(self::$logFolder) - 1];
if (strcmp($finalChar,self::DS) !== 0) self::$logFolder .= self::DS;
$path = self::$logFolder . $fileName . self::$logExtension;
$this->splFile = new SplFileObject($path,'a+');
//change the permission of the file
@chmod($path,self::$logPermission);
}
// The singleton method
// $instanceName: name of the key of self::$instance. It is also the name of the log file to open
public static function getInstance($instanceName)
{
if (!isset(self::$instance[$instanceName])) {
$className = __CLASS__;
self::$instance[$instanceName] = new $className($instanceName);
}
return self::$instance[$instanceName];
}
//write the string $string at the end of the file
public function writeString($string,$format = 'Y-m-d H:i:s')
{
$date = date($format);
$this->splFile->fwrite("[$date]\t".$string."\n");
}
//get the date string of the line $line
public function getDateString($line)
{
if (preg_match('/^[\[]{1}([a-zA-Z0-9:\-\s])*[\]]{1}/',$line,$match))
{
$match[0] = str_replace('[',null,$match[0]);
$match[0] = str_replace(']',null,$match[0]);
return $match[0];
}
else
{
return false;
}
}
//delete all the lines older than a number of days equal to $days
public function clearBefore($days = 30)
{
$tempArray = array();
$newTime = time() - (int)$days * 24 * 3600;
foreach ($this->splFile as $line)
{
$lineTime = strtotime($this->getDateString($line));
if ($lineTime !== false and $lineTime > $newTime)
{
$tempArray[] = $line;
}
}
$this->splFile->ftruncate(0);
foreach ($tempArray as $row)
{
$this->splFile->fwrite($row);
}
}
// Prevent users to clone the instance
public function __clone()
{
throw new Exception('error in '. __METHOD__.': clone is not allowed');
}
}
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