[11.x] add list rule

src/Illuminate/Translation/lang/en/validation.php

@@ -76,6 +76,7 @@
     'ipv4' => 'The :attribute field must be a valid IPv4 address.',
     'ipv6' => 'The :attribute field must be a valid IPv6 address.',
     'json' => 'The :attribute field must be a valid JSON string.',
+    'list' => 'The :attribute field must be a list.',
     'lowercase' => 'The :attribute field must be lowercase.',
     'lt' => [
         'array' => 'The :attribute field must have less than :value items.',

src/Illuminate/Validation/Concerns/ValidatesAttributes.php

@@ -421,6 +421,18 @@ public function validateArray($attribute, $value, $parameters = [])
         return empty(array_diff_key($value, array_fill_keys($parameters, '')));
     }
 
+    /**
+     * Validate that an attribute is a list.
+     *
+     * @param  string  $attribute
+     * @param  mixed  $value
+     * @return bool
+     */
+    public function validateList($attribute, $value)
+    {
+        return is_array($value) && array_is_list($value);
+    }
+
     /**
      * Validate that an array has all of the given keys.
      *

tests/Validation/ValidationValidatorTest.php

@@ -995,6 +995,23 @@ public function testValidateArray()
         $this->assertFalse($v->passes());
     }
 
+    public function testValidateList()
+    {
+        $trans = $this->getIlluminateArrayTranslator();
+
+        $v = new Validator($trans, ['foo' => [1, 2, 3]], ['foo' => 'list']);
+        $this->assertTrue($v->passes());
+
+        $v = new Validator($trans, ['foo' => new File('/tmp/foo', false)], ['foo' => 'list']);
+        $this->assertFalse($v->passes());
+
+        $v = new Validator($trans, ['foo' => [1 => 1, 2 => 2]], ['foo' => 'list']);
+        $this->assertFalse($v->passes());
+
+        $v = new Validator($trans, ['foo' => ['bar' => 'baz']], ['foo' => 'list']);
+        $this->assertFalse($v->passes());
+    }
+
     public function testValidateArrayKeys()
     {
         $trans = $this->getIlluminateArrayTranslator();