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@ 2014-08-21T20:47:39Z

<?php

    class Observer {
        static protected $events = array();
        static public function register($callable, $event){
            if (!isset(self::$events[$event])) {
                self::$events[$event] = array();
            }
            self::$events[$event][] = $callable;
        }
        static public function notify($event, $params = array()) {
            if (isset(self::$events[$event])) {
                foreach (self::$events[$event] AS $callable){
                    call_user_func_array($callable, $params);
                }
            }
        }
    }

    function print_meta($p1, $p2) {
        echo $p1 . ' ' . $p2;
    }

    function multiply_meta($p1, $p2) {
        echo $p1 * $p2;
    }

    function add_meta($p1, $p2) {
        echo $p1 + $p2;
    }

    Observer::register('print_meta', 'event1');
    Observer::register('multiply_meta', 'event1');

    Observer::register('print_meta', 'event2');
    Observer::register('add_meta', 'event2');

    Observer::register('multiply_meta', 'event3');
    Observer::register('add_meta', 'event3');

    echo "Notifying of event 1 \r\n";
    Observer::notify('event1', array(1, 2));
    echo "Notifying of event 2 \r\n";
    Observer::notify('event2', array(3, 4));
    echo "Notifying of event 3 \r\n";
    Observer::notify('event3', array(5, 6));

Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Notifying of event 1 1 22Notifying of event 2 3 47Notifying of event 3 3011
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STATIC, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/lQbgs on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STATIC, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/lQbgs on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/lQbgs on line 4
Process exited with code 255.

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