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namespace app\controller;

use app\model\DemoModel;

class Sum
{
    public function sum()
    {
        // ÔÚÕâÀï¾ÙÐÐÇóºÍÅÌËã
        return ['result' => $sum];
    }
}

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namespace app\model;

use think\Model;

class DemoModel extends Model
{
    protected $table = 'demo';

    public function getAgeByUserName($name)
    {
        return $this->where('name', $name)->value('age');
    }
}

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namespace app\controller;

use app\model\DemoModel;

class Sum
{
    public function sum()
    {
        // ÒýÈëÊý¾ÝÄ£×Ó
        $demoModel = new DemoModel;

        // ÅÌÎÊÕÅÈý¡¢ÀîËÄ¡¢ÍõÎåµÄÄêËêÐÅÏ¢
        $zhangsan = $demoModel->getAgeByUserName('ÕÅÈý');
        $lisi = $demoModel->getAgeByUserName('ÀîËÄ');
        $wangwu = $demoModel->getAgeByUserName('ÍõÎå');

        // ¶ÔÄêËêÐÅÏ¢¾ÙÐÐÇóºÍÅÌËã
        $sum = $zhangsan + $lisi + $wangwu;

        // ·µ»ØÅÌËãЧ¹û
        return ['result' => $sum];
    }
}

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