Using only arrays in rules instead comma-separated string

framework/yii/base/Model.php

@@ -91,19 +91,19 @@ class Model extends Component implements IteratorAggregate, ArrayAccess
 	 *
 	 * ~~~
 	 * [
-	 *     'attribute list',
+	 *     ['attribute1', 'attribute2'],
 	 *     'validator type',
-	 *     'on' => 'scenario name',
+	 *     'on' => ['scenario1', 'scenario2'],
 	 *     ...other parameters...
 	 * ]
 	 * ~~~
 	 *
 	 * where
 	 *
-	 *  - attribute list: required, specifies the attributes (separated by commas) to be validated;
+	 *  - attribute list: required, specifies the attributes array to be validated;
 	 *  - validator type: required, specifies the validator to be used. It can be the name of a model
 	 *    class method, the name of a built-in validator, or a validator class name (or its path alias).
-	 *  - on: optional, specifies the [[scenario|scenarios]] (separated by commas) when the validation
+	 *  - on: optional, specifies the [[scenario|scenarios]] array when the validation
 	 *    rule can be applied. If this option is not set, the rule will apply to all scenarios.
 	 *  - additional name-value pairs can be specified to initialize the corresponding validator properties.
 	 *    Please refer to individual validator class API for possible properties.
@@ -128,15 +128,15 @@ class Model extends Component implements IteratorAggregate, ArrayAccess
 	 * ~~~
 	 * [
 	 *     // built-in "required" validator
-	 *     ['username', 'required'],
+	 *     [['username'], 'required'],
 	 *     // built-in "string" validator customized with "min" and "max" properties
-	 *     ['username', 'string', 'min' => 3, 'max' => 12],
+	 *     [['username'], 'string', 'min' => 3, 'max' => 12],
 	 *     // built-in "compare" validator that is used in "register" scenario only
-	 *     ['password', 'compare', 'compareAttribute' => 'password2', 'on' => 'register'],
+	 *     [['password'], 'compare', 'compareAttribute' => 'password2', 'on' => 'register'],
 	 *     // an inline validator defined via the "authenticate()" method in the model class
-	 *     ['password', 'authenticate', 'on' => 'login'],
+	 *     [['password'], 'authenticate', 'on' => 'login'],
 	 *     // a validator of class "DateRangeValidator"
-	 *     ['dateRange', 'DateRangeValidator'],
+	 *     [['dateRange'], 'DateRangeValidator'],
 	 * ];
 	 * ~~~
 	 *

framework/yii/validators/Validator.php

@@ -133,17 +133,14 @@ abstract class Validator extends Component
 	 */
 	public static function createValidator($type, $object, $attributes, $params = [])
 	{
-		if (!is_array($attributes)) {
-			$attributes = preg_split('/[\s,]+/', $attributes, -1, PREG_SPLIT_NO_EMPTY);
-		}
-		$params['attributes'] = $attributes;
+		$params['attributes'] = (array) $attributes;
 
-		if (isset($params['on']) && !is_array($params['on'])) {
-			$params['on'] = preg_split('/[\s,]+/', $params['on'], -1, PREG_SPLIT_NO_EMPTY);
+		if (isset($params['on'])) {
+			$params['on'] = (array) $params['on'];
 		}
 
-		if (isset($params['except']) && !is_array($params['except'])) {
-			$params['except'] = preg_split('/[\s,]+/', $params['except'], -1, PREG_SPLIT_NO_EMPTY);
+		if (isset($params['except'])) {
+			$params['except'] = (array) $params['except'];
 		}
 
 		if (method_exists($object, $type)) {