wxxcx_learn

32个字符组成的一组随即字符串

function getRandChar($length){
    $str = null;
    $strPol = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890abcdefghijklmnopqrstuvwxyz";
    $max = strlen($strPol) - 1;
 
    for($i = 0;
    $i <$length;
    $i++){
        $str .= $strPol[rand(0,max)];
    }
    return $str;
}
闭包构建查询器

public static function getProductDetail($id){

$product = self::with([
    'imgs' => function($query){
    $query ->with(['imgUrl'])
    ->order('order','asc');
}])
->with(['properties'])
    ->find($id); 

    return $product;
}
 
生成订单号

public static function makeOrderNo()
{
    $yCode = array('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J');
    $orderSn =
        $yCode[intval(date('Y')) - 2017] . strtoupper(dechex(date('m'))) . date(
            'd') . substr(time(), -5) . substr(microtime(), 2, 5) . sprintf(
            '%02d', rand(0, 99));
    return $orderSn;
}