Slugger.php

example.php

<?php 
require_once('Slugger.php');


try {
  
	if (!@mysql_connect())
	{
    // Let's fake a small eror
		throw new Slug("Couldn't connect to database!");
	}
}
catch(Slug $e) // we catch a slug
{
	// instead of outputing the error, log it
	$e->log(); 

	// You can still work with the erorr like $e->getMessage();
}	
?>

Slugger.php

<?php
/**
 * Slugger, simple logging class
 * Writes logs into a file and sends them by e-mail once in a while
 * Written for pure example
 * @require PHP >= 5.3
 * @todo : Fix bug when the class is firt time instantiated it send an empty message
 */

/* Don't forget to setup a date default timezone */
date_default_timezone_set("Europe/Chisinau"); // because

class Slugger
{
  static $email       = "[email protected]";      // the e-mail to send logs to
	static $from        = "[email protected]";	  // simulate logger 
	static $mailer      = "mail";                 // send mail through
	static $path        = "logs";                 // folder to keep logs in
	static $report      = 1; 	                  // how often to send logs in minutes
	static $echo   	    = true;                   // echo the exception?
	static $lastLogName = "log.last_report.html"; // last log filename

	public static function prerequisites()
	{
		if (!file_exists( self::$path ))
		{
			try{
				@mkdir(self::$path);
			} 
			catch(Exception $e)
			{
				die($e->getMessage()); // we failed to create a folder to keep logs in
			}
			
		}

		if (!file_exists(self::$path . '/' . self::$lastLogName ))
		{
			try{
				@touch(self::$path . '/' . self::$lastLogName );
			} 
			catch(Exception $e)
			{
				die($e->getMessage());
			}
			
		}

		if (!file_exists(self::$path . '/.htaccess' ))
		{
			try{
				$str = "order allow,deny\ndeny from all";
				file_put_contents(self::$path . '/.htaccess' , $str );
			} 
			catch(Exception $e)
			{
				die($e->getMessage());
			}
			
		}

		if (version_compare( PHP_VERSION, '5.3.0') >= 0)
		{
			// pass
		}
		else
		{
			die("This class works with php 5.3.0 and up. Your PHP version is ". PHP_VERSION);
		}
	}

	public static function getLogFileName()
	{
		self::prerequisites(); // just in case, because we're paranoic

		$last_log = filemtime( self::$path . '/' . self::$lastLogName );
		$log = new DateTime('@'. $last_log );
		$log = $log->add(date_interval_create_from_date_string(self::$report . 'minutes'));

		return "log." . $log->getTimestamp() . ".html";


	}

	public static function log(Slug $exception )
	{
		self::prerequisites();
		$currentLog = self::getLogFileName();

		$str = "[%s]: %s\nLine: %s\nFile: %s\nCode: %s\n";
		$str .= "\n" . str_repeat('-', 80) . "\n";
		
		$message = sprintf( $str, date('d-m-Y H:i:s'), $exception->getMessage(), $exception->getLine(), $exception->getFile(), $exception->getCode());
		
		try {
			$fh = fopen( self::$path . "/" . $currentLog ,  'a');
			fwrite($fh , "\n" . $message);
			fclose($fh);
		} catch(Exception $e)
		{
			die("Couldn't write to log file, check file permissions");
		}

		// shall we send the log ?
		$log = new DateTime('@'. filemtime( self::$path . '/' . self::$lastLogName ) );
		$now = new DateTime( 'now' );

		// check time passed since the last update
		$passed = $log->diff( $now );
		if (intval( $passed->format('%i') ) > self::$report )
		{
			self::sendLog($currentLog);
		}
		

	}


	public static function sendLog( $logName )
	{
		// update the last log time
		@touch(self::$path . '/' .self::$lastLogName );
		// mail the log file name
		self::mail( $logName );
	}

	public static function mail($logName)
	{
		// sendmail because we're lazy
		
		// Mail headers
		$headers = "From: ".self::$from."\r\nReply-To: ". self::$from; 
		
		// 26214400 = 25mb
		if (filesize(self::$path . "/" . $logName) !== false && filesize(self::$path . "/". $logName) < 26214400) 
		{
			@mail(self::$email, "Slugger Log as of ". date('d-m-Y H:i:s'), file_get_contents(self::$path . "/" . $logName) , $headers);
		}
		else
		{
			return false;
		}

		
	}
}

class Slug extends Exception
{
	public function log()
	{
		Slugger::log( $this );
	}
}