TP5分页函数paginate中的each()传参

如果在each函数中想要调用外面的函数或者变量怎么办

如果在each()函数内调用外部变量，会发现直接报变量不存在的错误

$rows = empty($where['limit']) ? Config::get('paginate.list_rows') : $where['limit'];
        if(!empty($where['limit'])) {
            unset($where['limit']);
        }
        $tmp = 111;
        $list = self::
        field('umo.*,u.nickname,u.account')
        ->alias('umo')
        ->join('user u','umo.user_id=u.id','left')
        ->order('umo.id desc')
        ->where($where)
        ->paginate($rows,false,['query'=>$where])->each(function($item){
            dump($tmp);
            $item['typename'] =  UserMoneyLog::getType()[$item['type']];
        })->toArray()?:[];
        return $list;

然后我觉得是变量作用域问题，于是在each()里加了个global声明

$rows = empty($where['limit']) ? Config::get('paginate.list_rows') : $where['limit'];
        if(!empty($where['limit'])) {
            unset($where['limit']);
        }
        $tmp = 111;
        $list = self::
        field('umo.*,u.nickname,u.account')
        ->alias('umo')
        ->join('user u','umo.user_id=u.id','left')
        ->order('umo.id desc')
        ->where($where)
        ->paginate($rows,false,['query'=>$where])->each(function($item){
            global $tmp;
            dump($tmp);
            $item['typename'] =  UserMoneyLog::getType()[$item['type']];
        })->toArray()?:[];
        return $list;

虽然不报变量不存在了，但是打印出来的值是null，还是没有调用到外面的变量

最后，在each()函数后调用一个use函数，即可传参成功

$rows = empty($where['limit']) ? Config::get('paginate.list_rows') : $where['limit'];
        if(!empty($where['limit'])) {
            unset($where['limit']);
        }
        $tmp = 111;
        $list = self::
        field('umo.*,u.nickname,u.account')
        ->alias('umo')
        ->join('user u','umo.user_id=u.id','left')
        ->order('umo.id desc')
        ->where($where)
        ->paginate($rows,false,['query'=>$where])->each(function($item) use($tmp)/*添加的参数*/{
            dump($tmp);
            $item['typename'] =  UserMoneyLog::getType()[$item['type']];
        })->toArray()?:[];
        return $list;

如果在函数中需要修改变量的值，会发现在函数内，变量的值改变了，但是函数外面的变量值还是没变

$rows = empty($where['limit']) ? Config::get('paginate.list_rows') : $where['limit'];
        if(!empty($where['limit'])) {
            unset($where['limit']);
        }
        $tmp = 111;
        $list = self::
        field('umo.*,u.nickname,u.account')
        ->alias('umo')
        ->join('user u','umo.user_id=u.id','left')
        ->order('umo.id desc')
        ->where($where)
        ->paginate($rows,false,['query'=>$where])->each(function($item) use($tmp){
            $tmp = $tmp + 1;
            dump($tmp. '"tmp1"');
            $item['typename'] =  UserMoneyLog::getType()[$item['type']];
        })->toArray()?:[];
        dump($tmp . '"tmp2"');
        return $list;

这就是函数内外的变量作用域问题了，加一个&符即可解决

$rows = empty($where['limit']) ? Config::get('paginate.list_rows') : $where['limit'];
        if(!empty($where['limit'])) {
            unset($where['limit']);
        }
        $tmp = 111;
        $list = self::
        field('umo.*,u.nickname,u.account')
        ->alias('umo')
        ->join('user u','umo.user_id=u.id','left')
        ->order('umo.id desc')
        ->where($where)
        ->paginate($rows,false,['query'=>$where])->each(function($item) use(&$tmp){
            $tmp = $tmp + 1;
            dump($tmp. '"tmp1"');
            $item['typename'] =  UserMoneyLog::getType()[$item['type']];
        })->toArray()?:[];
        dump($tmp . '"tmp2"');
        return $list;