fixed bug:解决单元测试有未定义数组下标的警告信息导致不通过

composer.json

@@ -1,8 +1,7 @@
 {
 	"name" : "windwork/util",
 	"description" : "windwork util component，Windwork 工具组件",
-	"version" : "0.6.0",
-	"time" : "2017-06-28 18:30:00",
+	"version" : "0.6.1",
 	"require" : {
 		"php" : ">=5.5.0"
 	},

lib/Validator.php

@@ -53,21 +53,21 @@ public function validate(array $data, array $rules, $firstErrBreak = false)
 	{
 		$this->errors = [];
 		foreach ($rules as $key => $fieldRule) {
+            // 待验证字符串
+            $string = @$data[$key];
+
 			// 为空并且允许为空则不检查
-			if(empty($data[$key]) && !array_key_exists('required', $fieldRule)) {
+			if(empty($string) && !array_key_exists('required', $fieldRule)) {
 				continue;
 			}
 
-			// 待验证字符串
-			$string = $data[$key];
-
 			foreach ($fieldRule as $method => $msg) {
 				$method = trim($method);
 
 				// 自定义正则，下标第一个字符不是字母
 				// 自定义格式必须是以正则匹配规则作为下标，提示消息作为值
 				if (preg_match("/[^a-z]/i", $method[0])) {
-					if(!preg_match($method, $data[$key])) {
+					if(!preg_match($method, $string)) {
 						$this->errors[] = $msg;
 					}