file.php

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<?php
class Log_file extends Log
{
    var $_filename = 'php.log';

    var $_fp = false;

    var $_append = true;

    var $_locking = false;

    var $_mode = 0644;

    var $_dirmode = 0755;

    var $_lineFormat = '%1$s %2$s [%3$s] %4$s';

    var $_timeFormat = '%b %d %H:%M:%S';

    var $_eol = "\n";

    function Log_file($name, $ident = '', $conf = array(),
                      $level = PEAR_LOG_DEBUG)
    {
        $this->_id = md5(microtime());
        $this->_filename = $name;
        $this->_ident = $ident;
        $this->_mask = Log::UPTO($level);

        if (isset($conf['append'])) {
            $this->_append = $conf['append'];
        }

        if (isset($conf['locking'])) {
            $this->_locking = $conf['locking'];
        }

        if (!empty($conf['mode'])) {
            if (is_string($conf['mode'])) {
                $this->_mode = octdec($conf['mode']);
            } else {
                $this->_mode = $conf['mode'];
            }
        }

        if (!empty($conf['dirmode'])) {
            if (is_string($conf['dirmode'])) {
                $this->_dirmode = octdec($conf['dirmode']);
            } else {
                $this->_dirmode = $conf['dirmode'];
            }
        }

        if (!empty($conf['lineFormat'])) {
            $this->_lineFormat = str_replace(array_keys($this->_formatMap),
                                             array_values($this->_formatMap),
                                             $conf['lineFormat']);
        }

        if (!empty($conf['timeFormat'])) {
            $this->_timeFormat = $conf['timeFormat'];
        }

        if (!empty($conf['eol'])) {
            $this->_eol = $conf['eol'];
        } else {
            $this->_eol = (strstr(PHP_OS, 'WIN')) ? "\r\n" : "\n";
        }

        register_shutdown_function(array(&$this, '_Log_file'));
    }

    function _Log_file()
    {
        if ($this->_opened) {
            $this->close();
        }
    }

    function _mkpath($path, $mode = 0700)
    {
        /* Separate the last pathname component from the rest of the path. */
        $head = dirname($path);
        $tail = basename($path);

        /* Make sure we've split the path into two complete components. */
        if (empty($tail)) {
            $head = dirname($path);
            $tail = basename($path);
        }

        /* Recurse up the path if our current segment does not exist. */
        if (!empty($head) && !empty($tail) && !is_dir($head)) {
            $this->_mkpath($head, $mode);
        }

        /* Create this segment of the path. */
        return @mkdir($head, $mode);
    }

    function open()
    {
        if (!$this->_opened) {
            /* If the log file's directory doesn't exist, create it. */
            if (!is_dir(dirname($this->_filename))) {
                $this->_mkpath($this->_filename, $this->_dirmode);
            }

            /* Determine whether the log file needs to be created. */
            $creating = !file_exists($this->_filename);

            /* Obtain a handle to the log file. */
            $this->_fp = fopen($this->_filename, ($this->_append) ? 'a' : 'w');

            /* We consider the file "opened" if we have a valid file pointer. */
            $this->_opened = ($this->_fp !== false);

            /* Attempt to set the file's permissions if we just created it. */
            if ($creating && $this->_opened) {
                chmod($this->_filename, $this->_mode);
            }
        }

        return $this->_opened;
    }

    function close()
    {
        /* If the log file is open, close it. */
        if ($this->_opened && fclose($this->_fp)) {
            $this->_opened = false;
        }

        return ($this->_opened === false);
    }

    function flush()
    {
        if (is_resource($this->_fp)) {
            return fflush($this->_fp);
        }

        return false;
    }

    function log($message, $priority = null)
    {
        /* If a priority hasn't been specified, use the default value. */
        if ($priority === null) {
            $priority = $this->_priority;
        }

        /* Abort early if the priority is above the maximum logging level. */
        if (!$this->_isMasked($priority)) {
            return false;
        }

        /* If the log file isn't already open, open it now. */
        if (!$this->_opened && !$this->open()) {
            return false;
        }

        /* Extract the string representation of the message. */
        $message = $this->_extractMessage($message);

        /* Build the string containing the complete log line. */
        $line = $this->_format($this->_lineFormat,
                               strftime($this->_timeFormat),
                               $priority, $message) . $this->_eol;

        /* If locking is enabled, acquire an exclusive lock on the file. */
        if ($this->_locking) {
            flock($this->_fp, LOCK_EX);
        }

        /* Write the log line to the log file. */
        $success = (fwrite($this->_fp, $line) !== false);

        /* Unlock the file now that we're finished writing to it. */ 
        if ($this->_locking) {
            flock($this->_fp, LOCK_UN);
        }

        /* Notify observers about this log message. */
        $this->_announce(array('priority' => $priority, 'message' => $message));

        return $success;
    }

}