<?php
namespace App\Validate;

use Illuminate\Support\Facades\Validator;
/**
 * 扩展验证器
 */
class BaseValidate {

  /**
   * 当前验证规则
   * @var array
   */
  protected $rule = [];

  /**
   * 验证提示信息
   * @var array
   */
  protected $message = [];

  /**
   * 验证场景定义
   * @var array
   */
  protected $scene = [];

  /**
   * 设置当前验证场景
   * @var array
   */
  protected $currentScene = null;

  /**
   * 验证失败错误信息
   * @var array
   */
  protected $error = [];

  /**
   * 场景需要验证的规则
   * @var array
   */
  protected $only = [];


  /**
   * 设置验证场景
   * @access public
   * @param string $name 场景名
   * @return $this
   */
  public function scene($name)
  {
    // 设置当前场景
    $this->currentScene = $name;

    return $this;
  }

  /**
   * 数据验证
   * @access public
   * @param array   $data 数据
   * @param mixed   $rules 验证规则
   * @param array  $message 自定义验证信息
   * @param string  $scene 验证场景
   * @return bool
   */
  public function check($data, $rules = [], $message = [],$scene = '')
  {
    $this->error =[];
    if (empty($rules)) {
      //读取验证规则
      $rules = $this->rule;
    }
    if (empty($message)) {
      $message = $this->message;
    }

    //读取场景
    if (!$this->getScene($scene)) {
      return false;
    }

    //如果场景需要验证的规则不为空
    if (!empty($this->only)) {
      $new_rules = [];
      foreach ($this->only as $key => $value) {
        if (array_key_exists($value,$rules)) {
          $new_rules[$value] = $rules[$value];
        }  
      }
      $rules = $new_rules;
    }
    // var_dump($rules);die;
    $validator = Validator::make($data,$rules,$message);
    //验证失败
    if ($validator->fails()) {
      $this->error = $validator->errors()->first();
      return false;
    }

    return !empty($this->error) ? false : true;
  }

  /**
   * 获取数据验证的场景
   * @access protected
   * @param string $scene 验证场景
   * @return void
   */
  protected function getScene($scene = '')
  {
    if (empty($scene)) {
      // 读取指定场景
      $scene = $this->currentScene;
    }
    $this->only = [];

    if (empty($scene)) {
      return true;
    }

    if (!isset($this->scene[$scene])) {
      //指定场景未找到写入error
      $this->error = "scene:".$scene.'is not found';
      return false;
    }
    // 如果设置了验证适用场景
    $scene = $this->scene[$scene];
    if (is_string($scene)) {
      $scene = explode(',', $scene);
    }
    //将场景需要验证的字段填充入only
    $this->only = $scene;
    return true;
  }

  // 获取错误信息
  public function getError()
  {
    return $this->error;
  } 
}

<?php
namespace App\Validate;

use App\Validate\BaseValidate;
/**
 * 文章验证器
 */
class ArticleValidate extends BaseValidate {
  //验证规则
  protected $rule =[
    'id'=>'required',
    'title' => 'required|max:255',
    'content' => 'required',
  ];
  //自定义验证信息
  protected $message = [
    'id.required'=>'缺少文章id',
    'title.required'=>'请输入title',
    'title.max'=>'title长度不能大于 255',
    'content.required'=>'请输入内容',
  ];

  //自定义场景
  protected $scene = [
    'add'=>"title,content",
    'edit'=> ['id','title','content'],
  ];
}

public function update(){

    $ArticleValidate = new ArticleValidate;

    $request_data = [
      'id'=>'1',
      'title'=>'我是文章的标题',
      'content'=>'我是文章的内容',
    ];

    if (!$ArticleValidate->check($request_data)) {
      var_dump($ArticleValidate->getError());
    }
  }

//自定义场景
  protected $scene = [
    'add'=>"title,content",
    'edit'=> ['id','title','content'],
  ];

public function add(){

    $ArticleValidate = new ArticleValidate;

    $request_data = [
      'title'=>'我是文章的标题',
      'content'=>'我是文章的内容',
    ];

    if (!$ArticleValidate->scene('add')->check($request_data)) {
      var_dump($ArticleValidate->getError());
    }

  }

public function add(){

    $Validate = new BaseValidate;

    $request_data = [
      'title'=>'我是文章的标题',
      'content'=>'我是文章的内容',
    ];

    $rule =[
      'id'=>'required',
      'title' => 'required|max:255',
      'content' => 'required',
    ];
    //自定义验证信息
    $message = [
      'id.required'=>'缺少文章id',
      'title.required'=>'请输入title',
      'title.max'=>'title长度不能大于 255',
      'content.required'=>'请输入内容',
    ];

    if (!$Validate->check($request_data,$rule,$message)) {
      var_dump($Validate->getError());
    }
  }