Logger.php

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<?php
class Slim_Logger {

    protected $levels = array(
        0 => 'FATAL',
        1 => 'ERROR',
        2 => 'WARN',
        3 => 'INFO',
        4 => 'DEBUG'
    );

    protected $directory;

    public function __construct( $directory, $level = 4 ) {
        $this->setDirectory($directory);
        $this->setLevel($level);
    }

    public function setDirectory( $directory ) {
        $realPath = realpath($directory);
        if ( $realPath ) {
            $this->directory = rtrim($realPath, '/') . '/';
        } else {
            $this->directory = false;
        }
    }

    public function getDirectory() {
        return $this->directory;
    }

    public function setLevel( $level ) {
        $theLevel = (int)$level;
        if ( $theLevel >= 0 && $theLevel <= 4 ) {
            $this->level = $theLevel;
        } else {
            throw new InvalidArgumentException('Invalid Log Level. Must be one of: 0, 1, 2, 3, 4.');
        }
    }

    public function getLevel() {
        return $this->level;
    }

    public function debug( $data ) {
        $this->log($data, 4);
    }

    public function info( $data ) {
        $this->log($data, 3);
    }

    public function warn( $data ) {
        $this->log($data, 2);
    }

    public function error( $data ) {
        $this->log($data, 1);
    }

    public function fatal( $data ) {
        $this->log($data, 0);
    }

    public function getFile() {
        return $this->getDirectory() . strftime('%Y-%m-%d') . '.log';
    }

    protected function log( $data, $level ) {
        $dir = $this->getDirectory();
        if ( $dir == false || !is_dir($dir) ) {
            throw new RuntimeException("Log directory '$dir' invalid.");
        }
        if ( !is_writable($dir) ) {
            throw new RuntimeException("Log directory '$dir' not writable.");
        }
        if ( $level <= $this->getLevel() ) {
            $this->write(sprintf("[%s] %s - %s\r\n", $this->levels[$level], date('c'), (string)$data));
        }
    }

    protected function write( $data ) {
        @file_put_contents($this->getFile(), $data, FILE_APPEND | LOCK_EX);
    }

}