/**
* Bind callback to an event.
*
* Usage example:
* bind('products', 'get', function ($event)
* {
* if ($event['data']['search'])
* {
* return my_custom_search($event['data']['search']);
* }
* });
*/
function bind($target, $event, $callback = null, $level = 1)
{
global $__event_binds;
if (is_null($callback)) {
$callback = $event;
$event = $target;
$target = 0;
}
if (!is_callable($callback)) {
return false;
}
$events = bind_parse_events($target, $event);
foreach ($events as $event) {
$key = $event['key'];
$pre = $event['pre'];
$name = $event['name'];
// Make sure it's only bound once.
if (!is_array($__event_binds[$key][$pre][$name][$level])) {
$__event_binds[$key][$pre][$name][$level] = array();
}
foreach ($__event_binds[$key][$pre][$name] as $event_level) {
foreach ($event_level as $ex_callback) {
if ($ex_callback === $callback) {
return false;
}
}
}
// "Bind" the callback.
$__event_binds[$key][$pre][$name][$level][] = $callback;
// Sort levels.
ksort($__event_binds[$key][$pre][$name]);
}
return true;
}
/**
* Trigger callback for an event.
* Returns the first argument by default.
*
* Usage example:
* $value1 = trigger('target', 'eventname', $value1, $value2 [, $value3 ...]);
*/
function trigger($target, $event = null)
{
global $__event_binds;
// Get args.
$args = array_slice(func_get_args(), 2);
$events = bind_parse_events($target, $event);
foreach ($events as $event) {
$key = $event['key'];
$pre = $event['pre'];
$name = $event['name'];
// Prep args.
$result = count($args) ? $args[0] : 0;
// If pre is 'on', trigger 'before' binds first.
if ($pre == 'on') {
$pre_set = array('before', 'on');
} else {
$pre_set = array($pre);
}
// Reset cancel trigger.
$GLOBALS['__bind_stop'] = false;
// Trigger callback[s].
foreach ($pre_set as $pre) {
foreach ((array) $__event_binds[$key][$pre][$name] as $event_level) {
foreach ((array) $event_level as $callback) {
$return = call_user_func_array($callback, $args);
// Stop propagation?
if ($return === false) {
return false;
}
// Chain result.
if (count($args) > 1) {
$result = isset($return) ? $args[0] = $return : $args[0];
} else {
$result++;
}
// Stop chain?
if ($GLOBALS['__bind_stop']) {
$GLOBALS['__bind_stop'] = false;
return $return;
}
}
}
}
}
if (empty($events)) {
$result = count($args) ? $args[0] : 0;
}
return $result;
}
