Ascii rule added

Ascii unit test added

src/Valitron/Validator.php

@@ -505,6 +505,24 @@ class Validator
         return filter_var($value, \FILTER_VALIDATE_EMAIL) !== false;
     }
 
+    /**
+     * Validate that a field contains only ASCII characters
+     *
+     * @param $field
+     * @param $value
+     * @return bool|false|string
+     */
+    protected function validateAscii($field, $value)
+    {
+        // multibyte extension needed
+        if (function_exists('mb_detect_encoding')) {
+            return mb_detect_encoding($value, 'ASCII', true);
+        }
+
+        // fallback with regex
+        return 0 === preg_match('/[^\x00-\x7F]/', $value);
+    }
+
     /**
      * Validate that a field is a valid e-mail address and the domain name is active
      *

tests/Valitron/ValidateTest.php

@@ -617,6 +617,20 @@ class ValidateTest extends BaseTestCase
         $this->assertFalse($v->validate());
     }
 
+    public function testAsciiValid()
+    {
+        $v = new Validator(array('text' => '12345 abcde'));
+        $v->rule('ascii', 'text');
+        $this->assertTrue($v->validate());
+    }
+
+    public function testAsciiInvalid()
+    {
+        $v = new Validator(array('text' => '12345 abcdé'));
+        $v->rule('ascii', 'text');
+        $this->assertFalse($v->validate());
+    }
+
     public function testIpValid()
     {
         $v = new Validator(array('ip' => '127.0.0.1'));