优化ctms-api语法、修复已知BUG；

主要修复ctms-api、dacms对PHP新版本的支持问题

dacms-home/models/SignupForm.php

@@ -0,0 +1,72 @@
+<?php
+	
+	namespace frontend\models;
+	
+	use Yii;
+	use yii\base\Model;
+	use common\models\User;
+	
+	/**
+	 * Signup form
+	 */
+	class SignupForm extends Model
+	{
+		public $username;
+		public $email;
+		public $password;
+		
+		
+		/**
+		 * @inheritdoc
+		 */
+		public function rules()
+		{
+			return [
+				['username', 'trim'],
+				['username', 'required'],
+				['username', 'unique', 'targetClass' => '\common\models\User', 'message' => '该用户名已经有人注册了.'],
+				['username', 'string', 'min' => 2, 'max' => 255],
+				
+				['email', 'trim'],
+				['email', 'required'],
+				['email', 'email'],
+				['email', 'string', 'max' => 255],
+				['email', 'unique', 'targetClass' => '\common\models\User', 'message' => '该邮箱地址已经有人使用了.'],
+				
+				['password', 'required'],
+				['password', 'string', 'min' => 6],
+			];
+		}
+		
+		/**
+		 * @inheritdoc
+		 */
+		public function attributeLabels()
+		{
+			return [
+				'username' => Yii::t('frontend', 'Username'),
+				'password' => Yii::t('frontend', 'Password'),
+				'email' => Yii::t('frontend', 'Email'),
+			];
+		}
+		
+		/**
+		 * Signs user up.
+		 *
+		 * @return User|null the saved model or null if saving fails
+		 */
+		public function signup()
+		{
+			if (!$this->validate()) {
+				return NULL;
+			}
+			
+			$user = new User();
+			$user->username = $this->username;
+			$user->email = $this->email;
+			$user->setPassword($this->password);
+			$user->generateAuthKey();
+			
+			return $user->save() ? $user : NULL;
+		}
+	}