如下图所示，想要从 roles 中查询 id 为 4 的记录。

方法一：

$users = DB::table('users')
    ->where('column_name', 'LIKE', '%,4,%')
    ->orWhere('column_name', 'LIKE', '4,%')
    ->orWhere('column_name', 'LIKE', '%,4')
    ->get();

方法二：

$users = DB::table('users')
    ->whereRaw("FIND_IN_SET('4', column_name) > 0")
    ->get();

号外：

还有一种巧妙的设计，就是在值入库时人为增加一个逗号,4,12,14,56,44,65,24,这种。在查询时，直接用以下语句：

$users = DB::table('users')
    ->where('column_name', 'LIKE', '%,4%')
    ->get();

注意这里where('column_name', 'LIKE', '%,4%')的条件，是不是很妙。

<?php
use PhpOffice\PhpSpreadsheet\IOFactory as PHPExcel_IOFactory;
/**
 * 读取excel文件内容
 * @param string $filename  完整的文件路径
 * @return array 读取表格的结果数据
 */
function readExcelFile($filename)
{
    $fileParts = pathinfo($filename);
    $filetype = strtolower($fileParts['extension']);
    if (strtolower($filetype)=='xls') {
        $objReader = PHPExcel_IOFactory::createReader('Xls');
    } elseif (strtolower($filetype)=='xlsx') {
        $objReader = PHPExcel_IOFactory::createReader('Xlsx');
    } elseif (strtolower($filetype)=='csv') {
        $objReader = PHPExcel_IOFactory::createReader('Csv')
                        ->setDelimiter(',')
                        ->setInputEncoding('GBK') //处理csv读取中文异常问题
                        ->setEnclosure('"');
    }
    $objReader->setReadDataOnly(true);
    $objPHPExcel = $objReader->load($filename);
    $objWorksheet = $objPHPExcel->getActiveSheet();
    $highestRow = $objWorksheet->getHighestRow(); // 获取总行数
    $highestColumn = $objWorksheet->getHighestColumn();// 获取最大列号
    $excelResult = [];
    // 从第2行开始读取
    $startRow = 2;
    for ($j = $startRow; $j <= $highestRow; $j++) {
        // 从A列读取数据
        for ($k = 'A'; $k <= $highestColumn; $k++) {
            // 读取单元格
            $excelResult[$j][$k] = (string)$objWorksheet->getCell("$k$j")->getValue();
        }
    }
    return $excelResult;
}

条件聚合

实际上有一种非常简单的方法可以查询计算这些总数。诀窍是将条件放在聚合函数中。下面是一个 SQL 示例：

select
  count(*) as total,
  count(case when status = 'confirmed' then 1 end) as confirmed,
  count(case when status = 'unconfirmed' then 1 end) as unconfirmed,
  count(case when status = 'cancelled' then 1 end) as cancelled,
  count(case when status = 'bounced' then 1 end) as bounced
from subscribers

 total | confirmed | unconfirmed | cancelled | bounced
-------+-----------+-------------+-----------+---------
   200 |       150 |          50 |        30 |      25

以下是在 Model 中使用查询构建器编写此查询：

$totals = DB::table('subscribers')
    ->selectRaw('count(*) as total')
    ->selectRaw("count(case when status = 'confirmed' then 1 end) as confirmed")
    ->selectRaw("count(case when status = 'unconfirmed' then 1 end) as unconfirmed")
    ->selectRaw("count(case when status = 'cancelled' then 1 end) as cancelled")
    ->selectRaw("count(case when status = 'bounced' then 1 end) as bounced")
    ->first();

<div>Total: {{ $totals->total }}</div>
<div>Confirmed: {{ $totals->confirmed }}</div>
<div>Unconfirmed: {{ $totals->unconfirmed }}</div>
<div>Cancelled: {{ $totals->cancelled }}</div>
<div>Bounced: {{ $totals->bounced }}</div>

下面以ORM为例演示：

$result = $this->model->query()
->selectRaw('date_format(field_a, "%Y") as date, count(id) as count')
->groupBy('date')
->pluck('count', 'date')
->toArray();
$years = [];
foreach($result as $key=>$val) {
     $years['year'][] = $key. ' 学年';
     $years['datas'][] = $val;
}

与G银行对接时用到的

<?php
/**
 * Describe:
 * Author: liziyu
 * Date: 2022/10/31 11:10 AM
 */

namespace App\encrypt;

class MD5WithRSA
{
    /**
     * 利用约定数据和私钥生成数字签名
     * @param $data 待签数据
     * @return String 返回签名
     */
    public function sign($data='')
    {
        if (empty($data))
        {
            return false;
        }
        $private_key="MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgE==";
        $private_key = chunk_split($private_key, 64, "\n");
        $private_key = "-----BEGIN PRIVATE KEY-----\n$private_key-----END PRIVATE KEY-----";

        if (empty($private_key))
        {
            echo "私钥为空";
            return false;
        }
        // 生成密钥资源id
        $private_key_resource_id = openssl_get_privatekey($private_key);
        if (empty($private_key_resource_id))
        {
            echo "私钥资源id为空";
            return false;
        }

        $verify = openssl_sign($data, $signature, $private_key_resource_id, OPENSSL_ALGO_MD5);
        openssl_free_key($private_key_resource_id);
        // 二次Base64编码
        return base64_encode(base64_encode($signature));
    }

    /**
     * 利用公钥和数字签名以及约定数据验证合法性
     * @param string $data 待验证数据
     * @param string $signature 数字签名
     * @return  -1 验证错误；0 验证失败；1 验证成功
     */
    public function isValid($data='', $signature='')
    {
        if (empty($data) || empty($signature))
        {
            return false;
        }

        $public_key ="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCB";
        $public_key = chunk_split($public_key, 64, "\n");
        $public_key = "-----BEGIN PUBLIC KEY-----\n$public_key-----END PUBLIC KEY-----";

        if (empty($public_key))
        {
            echo "公钥为空";
            return false;
        }
        // 生成密钥资源id
        $public_key_resource_id = openssl_get_publickey($public_key);
        if (empty($public_key_resource_id))
        {
            echo "公钥资源id为空";
            return false;
        }

        // 对签名进行二次Base64解码
        $signature=base64_decode(base64_decode($signature));
        $ret = openssl_verify($data, $signature, $public_key_resource_id, OPENSSL_ALGO_MD5);
        openssl_pkey_free($public_key_resource_id);
        return $ret;
    }
}

微信小程序获取客户端手机号码，踩的坑。如下提示：

{"errcode":47001,"errmsg":"data format error hint: [6kMDxSDNRa-hAwqia] rid: 6308d1b5-69935bc9-1d99d19f"}

protected function getPhoneNo($code): string
    {
        try {
            $accessToken = $this->getAccessToken();
            if($accessToken) {
                //POST https://api.weixin.qq.com/wxa/business/getuserphonenumber?access_token=ACCESS_TOKEN
                $client = new Client();
                $url = config('mini.get_phone_number');
                $req = $client->post("$url?access_token={$accessToken}", [
                    'json' => [
                        'code' => $code
                    ]
                ]);
                var_export($req->getBody()->getContents());
            }
        } catch (\Throwable | \Exception $e) {
            return $e->getMessage();
        }
    }

这里需要注意的是，post请求时，格式需要用json格式，不能用body格式，即：

正确：

'json' => [
    'code' => $code
]

错误：

'form_params' => [
    'code' => $code
]

先理解几个概念:

1.StdClass 对象 => 基础的对象
2.Eloquent 模型对象 (Model 对象) => 和模型相关的类对象
3.Eloquent 集合 => 可以简单理解为对象数组，里面的每一个元素都是一个 Model 对象

DB Facades

1.$users = DB::table('users')->get(); 返回值：数组结果，其中每一个结果都是 StdClass
2.$user = DB::table('users')->first();返回值：单个 StdClass 实例

Eloquent

1.$user = User::first(); 返回值：Eloquent 对象 `
2.$user = User::find(); 返回值：Eloquent 对象 `
3.$users = User::get(); 返回值：Eloquent 集合
4.$users = User::all(); 返回值：Eloquent 集合
5.$user = User::create($data); 返回值：Eloquent 对象
6.$user = new User(); $user->name = "admin" $user->save(); 返回值：Eloquent 对象
7.$result = User::insert($data); 返回值：bool
8.$result = $user->delete(); 返回值：bool
9.$count = User::destroy([1, 2]); 返回值：删除记录数
10.$count = User::where('id', '>', 1)->delete(); 返回值：删除记录数
11.$count = User::where('id', '>', 10)->update(['status' => 1]);返回值：更新记录数
12.$count = User::where('id', '>', 10)->increment('age', 1);返回值：更新记录数

纯粹为了查阅方便，作者辛苦了！本文转自：
https://learnku.com/articles/15654/laravel-return-value

/**
 * 下划线转驼峰
 * @param $str
 * @return null|string|string[]
 */
public static function lineToHump($str)
{
    $str = preg_replace_callback('/([-_]+([a-z]{1}))/i', function ($matches) {
        return strtoupper($matches[2]);
    }, $str);
    return $str;
}

/**
 * 驼峰转下划线
 * @param $str
 * @return null|string|string[]
 */
public static function humpToLine($str)
{
    $str = preg_replace_callback('/([A-Z]{1})/', function ($matches) {
        return '_' . strtolower($matches[0]);
    }, $str);
    return $str;
}

方案一

方案二

原理

规则

数据ER

管理UI

数据表实例

特别声明：其中方案二为某大佬线上生产环境系统设计，如果侵犯到此权限请通知我删除，同时采纳者一同承担相应责任。

转自：https://cdc.tencent.com/2022/02/08/后台审批流系统设计指南/