diff --git a/cake/basics.php b/cake/basics.php
index 1c1dd61d1..d82fa49d0 100644
--- a/cake/basics.php
+++ b/cake/basics.php
@@ -810,7 +810,7 @@ if (!function_exists('file_put_contents')) {
 
 			foreach ($args[0] as $valueKey => $valueData) {
 				for ($i = 1; $i < $argc; $i++) {
-					if (isset($args[$i][$valueKey])) {
+					if (array_key_exists($valueKey, $args[$i])) {
 						continue 2;
 					}
 				}
diff --git a/cake/tests/cases/basics.test.php b/cake/tests/cases/basics.test.php
index a320bc075..7baeeb60f 100644
--- a/cake/tests/cases/basics.test.php
+++ b/cake/tests/cases/basics.test.php
@@ -54,6 +54,36 @@ class BasicsTest extends CakeTestCase {
 		Configure::write('localePaths', $this->_localePaths);
 		Configure::write('Config.language', $this->_language);
 	}
+/**
+ * test the array_diff_key compatibility function.
+ *
+ * @return void
+ **/
+	function testArrayDiffKey() {
+		$one = array('one' => 1, 'two' => 2, 'three' => 3);
+		$two = array('one' => 'one', 'two' => 'two');
+		$result = array_diff_key($one, $two);
+		$expected = array('three' => 3);
+		$this->assertEqual($result, $expected);
+
+		$one = array('one' => array('value', 'value-two'), 'two' => 2, 'three' => 3);
+		$two = array('two' => 'two');
+		$result = array_diff_key($one, $two);
+		$expected = array('one' => array('value', 'value-two'), 'three' => 3);
+		$this->assertEqual($result, $expected);
+
+		$one = array('one' => null, 'two' => 2, 'three' => '', 'four' => 0);
+		$two = array('two' => 'two');
+		$result = array_diff_key($one, $two);
+		$expected = array('one' => null, 'three' => '', 'four' => 0);
+		$this->assertEqual($result, $expected);
+
+		$one = array('minYear' => null, 'maxYear' => null, 'separator' => '-', 'interval' => 1, 'monthNames' => true);
+		$two = array('minYear' => null, 'maxYear' => null, 'separator' => '-', 'interval' => 1, 'monthNames' => true);
+		$result = array_diff_key($one, $two);
+		$this->assertEqual($result, array());
+
+	}
 /**
  * testHttpBase method
  *
@@ -110,10 +140,10 @@ class BasicsTest extends CakeTestCase {
 
 		$_SERVER['HTTPS'] = 'off';
 		$this->assertFalse(env('HTTPS'));
-		
+
 		$_SERVER['HTTPS'] = false;
 		$this->assertFalse(env('HTTPS'));
-		
+
 		$_SERVER['HTTPS'] = '';
 		$this->assertFalse(env('HTTPS'));
 
diff --git a/cake/tests/cases/libs/view/helpers/paginator.test.php b/cake/tests/cases/libs/view/helpers/paginator.test.php
index d3145596c..3b8817ab8 100644
--- a/cake/tests/cases/libs/view/helpers/paginator.test.php
+++ b/cake/tests/cases/libs/view/helpers/paginator.test.php
@@ -291,7 +291,7 @@ class PaginatorHelperTest extends CakeTestCase {
 
 		$this->assertEqual($result, $expected);
 
-		unset($this->paginator->params['paging']['article']['options']);
+		unset($this->Paginator->params['paging']['Article']['options']);
 		$this->Paginator->params['paging']['Article']['options']['direction'] = 'desc';
 		$result = $this->Paginator->sortDir();
 		$expected = 'desc';