加入default默认值设置，以及获取验证成功的参数

Author: zhouweiphp

src/Rules/Defaults.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Rakit\Validation\Rules;
+
+use Rakit\Validation\Rule;
+
+class Defaults extends Rule
+{
+
+    protected $message = "The :attribute default is :default";
+
+    protected $fillable_params = ['default'];
+
+    public function check($value)
+    {
+        $this->requireParameters($this->fillable_params);
+        
+        $default = $this->parameter('default');
+        return $default;
+    }
+
+}

src/Validation.php

@@ -4,6 +4,7 @@
 
 use Rakit\Validation\Rules\Required;
 use Closure;
+use Rakit\Validation\Rules\Defaults;
 
 class Validation
 {
@@ -19,6 +20,8 @@ class Validation
     protected $aliases = [];
 
     protected $messageSeparator = ':';
+    
+    protected $validata = [];
 
     public function __construct(Validator $validator, array $inputs, array $rules, array $messages = array())
     {
@@ -73,6 +76,12 @@ protected function validateAttribute(Attribute $attribute)
         $isEmptyValue = $this->isEmptyValue($value);
 
         foreach($rules as $ruleValidator) {
+            if ($isEmptyValue && $ruleValidator instanceof Defaults) {
+                $default = $ruleValidator->check(null);
+                $this->validata[$attributeKey] = $default;
+            } else {
+                $this->validata[$attributeKey] = $value;
+            }
             if ($isEmptyValue AND $this->ruleIsOptional($attribute, $ruleValidator)) {
                 continue;
             }
@@ -421,5 +430,9 @@ protected function resolveInputAttributes(array $inputs)
 
         return $resolvedInputs;
     }
+    
+    public function getValidata() {
+        return $this->validata;
+    }
 
 }

src/Validator.php

@@ -104,6 +104,7 @@ protected function registerBaseValidators()
             'callback'                  => new Rules\Callback,
             'before'                    => new Rules\Before,
             'after'                     => new Rules\After,
+            'defaults'                  => new Rules\Defaults,
         ];
 
         foreach($baseValidator as $key => $validator) {