Small Logger Class

smalllog.php

<?php

/*
 * SmallLog
 *
 * Usage:
 *
 * SmallLog::instance()->setPath('path/to/log/directory');
 * SmallLog::add('This line is added to the log');
 * SmallLog::add('This line too');
 * SmallLog::write('logfile.log');
 */

// Comment this line to disable error logging:
set_error_handler(array('SmallLog', 'errorHandlerCallback'));

class SmallLog
{
    private $_log;
    private $_path;

    protected static $_instance;

    private function __construct()
    {
        $this->_log = array();
    }

    /**
     * @static
     * @return SmallLog
     */
    public static function instance()
    {
        if(!self::$_instance)
        {
            self::$_instance = new SmallLog();
        }
        return self::$_instance;
    }

    /**
     * Set the path where the logs are stored.
     * @param $path
     */
    public function setPath($path)
    {
        $this->_path = $path;
    }

    /**
     * Add a line to the log
     * @param $line
     */
    public function add($line)
    {
        $this->_log[] = '['.date('Y-m-d H:i:s').'] : '.$line;
    }

    /**
     * Write the log
     * @param string $file      filename
     * @param bool $appendDate  append the date to the filename
     */
    public function write($file, $appendDate = true)
    {
        if($appendDate)
        {
            $info = pathinfo($this->_path.'/'.$file);
            $path = $info['dirname'].'/'.$info['filename'].'.'.strftime('%Y-%m-%d', time()).'.'.$info['extension'];
        } else {
            $path = $this->_path.'/'.$file;
        }
        file_put_contents($path, implode("\n", $this->_log)."\n\n---\n\n", FILE_APPEND);
    }

    /**
     * Public function to output log in case of a script-stopping-error
     * @param $code
     * @param $string
     * @param $file
     * @param $line
     * @param $context
     */
    public static function errorHandlerCallback($code, $string, $file, $line, $context)
    {
        self::instance()->add('!!! Fatal Error !!!');
        self::instance()->add('code: '.$code);
        self::instance()->add('string: '.$string);
        self::instance()->add('file: '.$file);
        self::instance()->add('line: '.$line);
        self::instance()->write('error.log');
    }
}