thinkphp/library/think/model/concern/ModelEvent.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\model\concern;

use think\Container;
use think\Loader;

/**
 * 模型事件处理
 */
trait ModelEvent
{
    /**
     * 模型回调
     * @var array
     */
    private static $event = [];

    /**
     * 模型事件观察
     * @var array
     */
    protected static $observe = ['before_write', 'after_write', 'before_insert', 'after_insert', 'before_update', 'after_update', 'before_delete', 'after_delete', 'before_restore', 'after_restore'];

    /**
     * 绑定模型事件观察者类
     * @var array
     */
    protected $observerClass;

    /**
     * 是否需要事件响应
     * @var bool
     */
    private $withEvent = true;

    /**
     * 注册回调方法
     * @access public
     * @param  string   $event    事件名
     * @param  callable $callback 回调方法
     * @param  bool     $override 是否覆盖
     * @return void
     */
    public static function event($event, $callback, $override = false)
    {
        $class = static::class;

        if ($override) {
            self::$event[$class][$event] = [];
        }