<?php
    define( "DEBUG", true );

    class Logger
    {
        private $_traceOutput;
        private $_debugOutput;
        private $_isDebugActive;

        static private $_instance;

        static public function init( $traceOutput = STDOUT , $debugOutput = STDERR )
        {
            self::$_instance = new Logger( $traceOutput, $debugOutput );
        }

        static public function getInstance( )
        {
            return self::$_instance;
        }

        static public function trace( $msg )
        {
            self::$_instance->traceMessage( $msg );
        }

        static public function debug( $msg )
        {
            self::$_instance->debugMessage( $msg );
        }

        public function __construct( $traceOutput, $debugOutput )
        {
            $this->_traceOutput = $traceOutput;
            $this->_debugOutput = $debugOutput;

            // _isDebugActive indica se siamo in debug mode o meno
            $this->_isDebugActive = DEBUG;
        }

        public function __destruct()
        {
            fclose( $this->_debugOutput );
            fclose( $this->_traceOutput );
        }

        public function getDebugModeIsOn()
        {
            return $this->_isDebugActive;
        }

        private function writeOnDebug( $handle, $message )
        {
            if( $this->getDebugModeIsOn() )
            {
                fwrite( $handle, $message );
            }
        }

        public function traceMessage( $message )
        {
            $this->writeOnDebug( $this->_traceOutput, $message );
        }

        public function debugMessage( $message )
        {
            $this->writeOnDebug( $this->_debugOutput, $message );
        }
    }

    Logger::init();
    Logger::debug( "lol\n" );
?>