thinkphp/library/think/Hook.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think;

class Hook
{
    /**
     * @var array 标签
     */
    private static $tags = [];

    /**
     * 动态添加行为扩展到某个标签
     * @access public
     * @param  string $tag      标签名称
     * @param  mixed  $behavior 行为名称
     * @param  bool   $first    是否放到开头执行
     * @return void
     */
    public static function add($tag, $behavior, $first = false)
    {
        isset(self::$tags[$tag]) || self::$tags[$tag] = [];

        if (is_array($behavior) && !is_callable($behavior)) {
            if (!array_key_exists('_overlay', $behavior) || !$behavior['_overlay']) {
                unset($behavior['_overlay']);
                self::$tags[$tag] = array_merge(self::$tags[$tag], $behavior);
            } else {
                unset($behavior['_overlay']);
                self::$tags[$tag] = $behavior;
            }
        } elseif ($first) {
            array_unshift(self::$tags[$tag], $behavior);
        } else {
            self::$tags[$tag][] = $behavior;
        }
    }

    /**
     * 批量导入插件
     * @access public
     * @param  array   $tags      插件信息
     * @param  boolean $recursive 是否递归合并
     * @return void
     */
    public static function import(array $tags, $recursive = true)
    {
        if ($recursive) {
            foreach ($tags as $tag => $behavior) {
                self::add($tag, $behavior);
            }