Move contains() across.

Fix a few issues in contains() with nested needle values.

lib/Cake/Test/Case/Utility/Set2Test.php

@@ -473,4 +473,31 @@ class Set2Test extends CakeTestCase {
 		$expected = array('one' => array('a', 'b', 'c' => 'cee'), 'two' => 2, 'three' => null);
 		$this->assertEquals($expected, $result);
 	}
+
+/**
+ * testContains method
+ *
+ * @return void
+ */
+	public function testContains() {
+		$data = array('apple', 'bee', 'cyclops');
+		// $this->assertTrue(Set2::contains($data, array('apple')));
+		// $this->assertFalse(Set2::contains($data, array('data')));
+
+		$a = array(
+			0 => array('name' => 'main'),
+			1 => array('name' => 'about')
+		);
+		$b = array(
+			0 => array('name' => 'main'),
+			1 => array('name' => 'about'),
+			2 => array('name' => 'contact'),
+			'a' => 'b'
+		);
+
+		$this->assertTrue(Set2::contains($a, $a));
+		$this->assertFalse(Set2::contains($a, $b));
+		$this->assertTrue(Set2::contains($b, $a));
+	}
+
 }

lib/Cake/Utility/Set2.php

@@ -70,8 +70,29 @@ class Set2 {
 
 	}
 
-	public static function contains(array $data, $needle) {
+/**
+ * Determines if one array contains the exact keys and values of another.
+ *
+ * @param array $data The data to search through.
+ * @param array $needle The values to file in $data
+ * @return boolean true if $data contains $needle, false otherwise
+ * @link http://book.cakephp.org/2.0/en/core-utility-libraries/set.html#Set::contains
+ */
+	public static function contains(array $data, array $needle) {
+		if (empty($data) || empty($needle)) {
+			return false;
+		}
 
+		foreach ($needle as $key => $val) {
+			if (isset($data[$key]) && is_array($val)) {
+				if (!Set2::contains($data[$key], $val)) {
+					return false;
+				}
+			} elseif (!isset($data[$key]) || $data[$key] != $val) {
+				return false;
+			}
+		}
+		return true;
 	}
 
 	public static function check(array $data, $path) {