observer.php

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<?php
class Log_observer
{
    var $_id = 0;

    var $_priority = PEAR_LOG_INFO;

    function Log_observer($priority = PEAR_LOG_INFO)
    {
        $this->_id = md5(microtime());
        $this->_priority = $priority;
    }

    function &factory($type, $priority = PEAR_LOG_INFO, $conf = array())
    {
        $type = strtolower($type);
        $class = 'Log_observer_' . $type;

        /*
         * If the desired class already exists (because the caller has supplied
         * it from some custom location), simply instantiate and return a new
         * instance.
         */
        if (class_exists($class)) {
            $object = new $class($priority, $conf);
            return $object;
        }

        /* Support both the new-style and old-style file naming conventions. */
        $newstyle = true;
        $classfile = dirname(__FILE__) . '/observer_' . $type . '.php';

        if (!file_exists($classfile)) {
            $classfile = 'Log/' . $type . '.php';
            $newstyle = false;
        }

        /*
         * Attempt to include our version of the named class, but don't treat
         * a failure as fatal.  The caller may have already included their own
         * version of the named class.
         */
        @include_once $classfile;

        /* If the class exists, return a new instance of it. */
        if (class_exists($class)) {
            /* Support both new-style and old-style construction. */
            if ($newstyle) {
                $object = new $class($priority, $conf);
            } else {
                $object = new $class($priority);
            }
            return $object;
        }

        $null = null;
        return $null;
    }

    function notify($event)
    {
        print_r($event);
    }
}