* 用途
面向切面编程，向某个点注入处理流程
* 定义
~~~
trait HookTrait
{
/**
* 默认钩子方法
*
* @var unknown
*/
protected $_hookMethod = 'hook';
/**
* 钩子
*
* @var unknown
*/
protected $_hooks = [];
/**
* 获取钩子
*
* @param string $hook
*
* @return array|null
*/
public function getHook($name = null)
{
if (empty($name)) {
return $this->_hooks;
} else {
return isset($this->_hooks[$name]) ? $this->_hooks[$name] : [];
}
}
/**
* 增加钩子
*
* @param string $name
* @param mixed $behavior
* @param integer $weight
* @param string $tagKey
*/
public function addHook($name, $behavior, $weight = 0, $key = null)
{
if (is_array($behavior)) {
// 添加多个钩子
foreach ($behavior as $item) {
$this->addHook($name, $item, $key, $weight);
}
} else {
isset($this->_hooks[$name]) || $this->_hooks[$name] = [];
// 避免重复添加
$key || $key = md5(serialize($behavior));
$this->_hooks[$name][$key] = $this->formatHook($behavior, $weight, $key);
}
}
/**
* 调用钩子
*
* @param string $name
* @param mixed $params
* @param mixed $extra
*
* @return array
*/
public function callHook($name, &$params, $extra = null)
{
$results = [];
$hooks = $this->getHook($name);
// 排序
usort($hooks, [
$this,
'compareHookWeight'
]);
foreach ($hooks as $key => $hook) {
$results[$key] = $this->executeHook($hook['behavior'], $params, $extra);
// 返回false则停止执行
if (false === $results[$key]) {
break;
}
}
return $results;
}
/**
* 重置钩子
*/
public function resetHook()
{
$this->_hooks = [];
}
/**
* 执行钩子
*
* @param string $behavior
* @param mixed $params
* @param mixed $extra
*
* @return mixed
*/
protected function executeHook($behavior, &$params = null, $extra = null)
{
if (is_string($behavior)) {
if (strpos($behavior, '::')) {
$behavior = explode('::', $behavior, 2);
} else {
$behavior = [
$behavior,
$this->_hookMethod
];
}
}
return call_user_func_array($behavior, [
&$params,
$extra,
$this
]);
}
/**
* 比较两个钩子权值
*
* @param array $a
* @param array $b
*
* @return boolean
*/
protected function compareHookWeight($a, $b)
{
return $a['weight'] <= $b['weight'];
}
/**
* 格式化钩子
*
* @param mixed $behavior
* @param number $weight
* @param string $key
*
* @return array
*/
protected function formatHook($behavior, $weight = 0, $key = null)
{
return [
'behavior' => $behavior,
'weight' => $weight,
'key' => $key
];
}
}
~~~
