Index: library/Zend/Form/Element.php
===================================================================
--- library/Zend/Form/Element.php       (revision 24092)
+++ library/Zend/Form/Element.php       (working copy)
@@ -1377,15 +1377,23 @@
             if ($isArray && is_array($value)) {
                 $messages = array();
                 $errors   = array();
-                foreach ($value as $val) {
-                    if (!$validator->isValid($val, $context)) {
+                if (empty($value)) {
+                    if ($this->isRequired()
+                        || (!$this->isRequired() && !$this->getAllowEmpty())
+                    ) {
                         $result = false;
-                        if ($this->_hasErrorMessages()) {
-                            $messages = $this->_getErrorMessages();
-                            $errors   = $messages;
-                        } else {
-                            $messages = array_merge($messages, $validator->getMessages());
-                            $errors   = array_merge($errors,   $validator->getErrors());
+                    }
+                } else {
+                    foreach ($value as $val) {
+                        if (!$validator->isValid($val, $context)) {
+                            $result = false;
+                            if ($this->_hasErrorMessages()) {
+                                $messages = $this->_getErrorMessages();
+                                $errors   = $messages;
+                            } else {
+                                $messages = array_merge($messages, $validator->getMessages());
+                                $errors   = array_merge($errors,   $validator->getErrors());
+                            }
                         }
                     }
                 }
Index: tests/Zend/Form/ElementTest.php
===================================================================
--- tests/Zend/Form/ElementTest.php     (revision 24092)
+++ tests/Zend/Form/ElementTest.php     (working copy)
@@ -2189,6 +2189,39 @@
         $validator = $username->getValidator('regex');
         $this->assertTrue($validator->zfBreakChainOnFailure);
     }
+
+    /**
+     * @group ZF-11402
+     */
+    public function testValidatorForArrayElementsDoesNotAcceptEmptyArray()
+    {
+        $element = new Zend_Form_Element('test');
+        $element->setIsArray(true);
+        $element->addValidator('InArray',true,array(
+            'haystack'=>array('k1','k2')
+        ));
+        $this->assertTrue($element->isValid(array('test'=>'k1')));
+        $this->assertTrue($element->isValid(array('test'=>'k2')));
+        $this->assertFalse($element->isValid(array('test'=>'k9')));
+
+        $element->setRequired(false);
+        $element->setAllowEmpty(false);
+        $this->assertFalse($element->isValid(array()));
+
+        $element->setRequired(false);
+        $element->setAllowEmpty(true);
+        $this->assertTrue($element->isValid(array()));
+
+        $element->setRequired(true);
+        $element->setAllowEmpty(true);
+        $this->assertFalse($element->isValid(array()));
+
+        $element->setRequired(true);
+        $element->setAllowEmpty(false);
+        $this->assertFalse($element->isValid(array()));
+
+    }
+
 }

 class Zend_Form_ElementTest_Decorator extends Zend_Form_Decorator_Abstract
Index: tests/Zend/Form/Element/MultiCheckboxTest.php
===================================================================
--- tests/Zend/Form/Element/MultiCheckboxTest.php       (revision 24092)
+++ tests/Zend/Form/Element/MultiCheckboxTest.php       (working copy)
@@ -278,6 +278,29 @@
         $this->element->isValid(array('foo', 'bogus'));
         $html = $this->element->render($this->getView());
     }
+
+    /**
+     * @group ZF-11402
+     */
+    public function testValidateShouldNotAcceptEmptyArray()
+    {
+        $this->element->addMultiOptions(array(
+            'foo' => 'Foo',
+            'bar' => 'Bar',
+            'baz' => 'Baz',
+        ));
+        $this->element->setRegisterInArrayValidator(true);
+
+        $this->assertTrue($this->element->isValid(array('foo')));
+        $this->assertTrue($this->element->isValid(array('foo','baz')));
+
+        $this->element->setAllowEmpty(true);
+        $this->assertTrue($this->element->isValid(array()));
+
+        $this->element->setAllowEmpty(false);
+        $this->assertFalse($this->element->isValid(array()));
+    }
+
 }

 // Call Zend_Form_Element_MultiCheckboxTest::main() if this source file is executed directly.