diff --git a/src/wp-includes/functions.php b/src/wp-includes/functions.php
index 94d6de3eb5..bee66303df 100644
--- a/src/wp-includes/functions.php
+++ b/src/wp-includes/functions.php
@@ -2882,21 +2882,51 @@ function wp_list_filter( $list, $args = array(), $operator = 'AND' ) {
 /**
  * Pluck a certain field out of each object in a list.
  *
+ * This has the same functionality and prototype of
+ * array_column() (PHP 5.5) but also supports objects.
+ *
  * @since 3.1.0
  *
  * @param array $list A list of objects or arrays
  * @param int|string $field A field from the object to place instead of the entire object
+ * @param int|string $index_key A field from the object to use as keys for the new array
  * @return array
  */
-function wp_list_pluck( $list, $field ) {
-	foreach ( $list as $key => $value ) {
-		if ( is_object( $value ) )
-			$list[ $key ] = $value->$field;
-		else
-			$list[ $key ] = $value[ $field ];
+function wp_list_pluck( $list, $field, $index_key = null ) {
+	if ( ! $index_key ) {
+		// This is simple. Could at some point wrap array_column()
+		// if we knew we had an array of arrays.
+		foreach ( $list as $key => $value ) {
+			if ( is_object( $value ) ) {
+				$list[ $key ] = $value->$field;
+			} else {
+				$list[ $key ] = $value[ $field ];
+			}
+		}
+		return $list;
 	}
 
-	return $list;
+	// When index_key is not set for a particular item,
+	// push the value to the end of the stack.
+	// This is how array_column() behaves.
+	$newlist = array();
+	foreach ( $list as $value ) {
+		if ( is_object( $value ) ) {
+			if ( isset( $value->$index_key ) ) {
+				$newlist[ $value->$index_key ] = $value->$field;
+			} else {
+				$newlist[] = $value->$field;
+			}
+		} else {
+			if ( isset( $value[ $index_key ] ) ) {
+				$newlist[ $value[ $index_key ] ] = $value[ $field ];
+			} else {
+				$newlist[] = $value[ $field ];
+			}
+		}
+	}
+
+	return $newlist;
 }
 
 /**
diff --git a/tests/phpunit/tests/functions/listFilter.php b/tests/phpunit/tests/functions/listFilter.php
index ac1847b5a9..9fe640a261 100644
--- a/tests/phpunit/tests/functions/listFilter.php
+++ b/tests/phpunit/tests/functions/listFilter.php
@@ -11,9 +11,9 @@ class Tests_Functions_ListFilter extends WP_UnitTestCase {
 
 	function setUp() {
 		parent::setUp();
-		$this->array_list['foo'] = array( 'name' => 'foo', 'field1' => true, 'field2' => true, 'field3' => true, 'field4' => array( 'red' ) );
-		$this->array_list['bar'] = array( 'name' => 'bar', 'field1' => true, 'field2' => true, 'field3' => false, 'field4' => array( 'green' ) );
-		$this->array_list['baz'] = array( 'name' => 'baz', 'field1' => true, 'field2' => false, 'field3' => false, 'field4' => array( 'blue' ) );
+		$this->array_list['foo'] = array( 'name' => 'foo', 'id' => 'f', 'field1' => true, 'field2' => true, 'field3' => true, 'field4' => array( 'red' ) );
+		$this->array_list['bar'] = array( 'name' => 'bar', 'id' => 'b', 'field1' => true, 'field2' => true, 'field3' => false, 'field4' => array( 'green' ) );
+		$this->array_list['baz'] = array( 'name' => 'baz', 'id' => 'z', 'field1' => true, 'field2' => false, 'field3' => false, 'field4' => array( 'blue' ) );
 		foreach ( $this->array_list as $key => $value ) {
 			$this->object_list[ $key ] = (object) $value;
 		}
@@ -66,6 +66,50 @@ class Tests_Functions_ListFilter extends WP_UnitTestCase {
 		$this->assertEquals( array( 'foo' => 'foo', 'bar' => 'bar', 'baz' => 'baz' ) , $list );
 	}
 
+	/**
+	 * @ticket 28666
+	 */
+	function test_wp_list_pluck_index_key() {
+		$list = wp_list_pluck( $this->array_list, 'name', 'id' );
+		$this->assertEquals( array( 'f' => 'foo', 'b' => 'bar', 'z' => 'baz' ), $list );
+	}
+
+	/**
+	 * @ticket 28666
+	 */
+	function test_wp_list_pluck_object_index_key() {
+		$list = wp_list_pluck( $this->object_list, 'name', 'id' );
+		$this->assertEquals( array( 'f' => 'foo', 'b' => 'bar', 'z' => 'baz' ), $list );
+	}
+
+	/**
+	 * @ticket 28666
+	 */
+	function test_wp_list_pluck_missing_index_key() {
+		$list = wp_list_pluck( $this->array_list, 'name', 'nonexistent' );
+		$this->assertEquals( array( 0 => 'foo', 1 => 'bar', 2 => 'baz' ), $list );
+	}
+
+	/**
+	 * @ticket 28666
+	 */
+	function test_wp_list_pluck_partial_missing_index_key() {
+		$array_list = $this->array_list;
+		unset( $array_list[ 'bar']['id'] );
+		$list = wp_list_pluck( $array_list, 'name', 'id' );
+		$this->assertEquals( array( 'f' => 'foo', 0 => 'bar', 'z' => 'baz' ), $list );
+	}
+
+	/**
+	 * @ticket 28666
+	 */
+	function test_wp_list_pluck_mixed_index_key() {
+		$mixed_list = $this->array_list;
+		$mixed_list['bar'] = (object) $mixed_list['bar'];
+		$list = wp_list_pluck( $mixed_list, 'name', 'id' );
+		$this->assertEquals( array( 'f' => 'foo', 'b' => 'bar', 'z' => 'baz' ), $list );
+	}
+
 	function test_filter_object_list_nested_array_and() {
 		$list = wp_filter_object_list( $this->object_list, array( 'field4' => array( 'blue' ) ), 'AND' );
 		$this->assertEquals( 1, count( $list ) );