Index: wp-includes/taxonomy.php
===================================================================
--- wp-includes/taxonomy.php	(revision 14075)
+++ wp-includes/taxonomy.php	(working copy)
@@ -67,25 +67,21 @@
  * @uses $wp_taxonomies
  * @see register_taxonomy
  *
- * @param array $args An array of key => value arguments to match against the taxonomies.
- *  Only taxonomies having attributes that match all arguments are returned.
+ * @param array $args An array of key => value arguments to match against the taxonomy objects.
  * @param string $output The type of output to return, either taxonomy 'names' or 'objects'. 'names' is the default.
+ * @param string $operator The logical operation to perform. 'or' means only one element 
+ *  from the array needs to match; 'and' means all elements must match. The default is 'and'.
  * @return array A list of taxonomy names or objects
  */
-function get_taxonomies( $args = array(), $output = 'names' ) {
+function get_taxonomies( $args = array(), $output = 'names', $operator = 'and' ) {
 	global $wp_taxonomies;
 
-	$taxonomies = array();
-	foreach ( (array) $wp_taxonomies as $taxname => $taxobj )
-		if ( empty($args) || array_intersect_assoc((array) $taxobj, $args) )
-			$taxonomies[$taxname] = $taxobj;
+	$field = ('names' == $output) ? 'name' : false;
 
-	if ( 'names' == $output )
-		return array_keys($taxonomies);
-
-	return $taxonomies;
+	return wp_filter_object_list($wp_taxonomies, $args, $operator, $field);
 }
 
+
 /**
  * Return all of the taxonomy names that are of $object_type.
  *
Index: wp-includes/post.php
===================================================================
--- wp-includes/post.php	(revision 14075)
+++ wp-includes/post.php	(working copy)
@@ -622,42 +622,18 @@
  * @see register_post_status
  * @see get_post_status_object
  *
- * @param array|string $args An array of key => value arguments to match against the post statuses.
- *  Only post statuses having attributes that match all arguments are returned.
+ * @param array|string $args An array of key => value arguments to match against the post status objects.
  * @param string $output The type of output to return, either post status 'names' or 'objects'. 'names' is the default.
- * @param string $operator Whether the elements in $args should be logicallly 'or'ed or 'and'ed together. 'or' means only one element from the array needs to match. 'and' means all elements must match. The default is 'or'.
+ * @param string $operator The logical operation to perform. 'or' means only one element 
+ *  from the array needs to match; 'and' means all elements must match. The default is 'and'.
  * @return array A list of post type names or objects
  */
-function get_post_stati( $args = array(), $output = 'names', $operator = 'or' ) {
+function get_post_stati( $args = array(), $output = 'names', $operator = 'and' ) {
 	global $wp_post_statuses;
 
-	$do_names = false;
-	if ( 'names' == $output )
-		$do_names = true;
+	$field = ('names' == $output) ? 'name' : false;
 
-	if ( 'and' == $operator )
-		$arg_count = count($args);
-	else
-		$arg_count = 0;
-
-	$post_statuses = array();
-	foreach ( (array) $wp_post_statuses as $post_status ) {
-		if ( empty($args) ) {
-			if ( $do_names )
-				$post_statuses[] = $post_status->name;
-			else
-				$post_statuses[] = $post_status;
-		} elseif ( $intersect = array_intersect_assoc((array) $post_status, $args) ) {
-			if ( $arg_count && ( $arg_count != count($intersect) ) )
-				continue;
-			if ( $do_names )
-				$post_statuses[] = $post_status->name;
-			else
-				$post_statuses[] = $post_status;
-		}
-	}
-
-	return $post_statuses;
+	return wp_filter_object_list($wp_post_statuses, $args, $operator, $field);
 }
 
 /**
@@ -692,7 +668,7 @@
  * @param mixed $the_post Optional. Post object or post ID.
  * @return bool|string post type or false on failure.
  */
-function get_post_type($the_post = false) {
+function get_post_type( $the_post = false ) {
 	global $post;
 
 	if ( false === $the_post )
@@ -736,36 +712,19 @@
  * @since 2.9.0
  * @uses $wp_post_types
  * @see register_post_type
- * @see get_post_types
  *
- * @param array|string $args An array of key => value arguments to match against the post types.
- *  Only post types having attributes that match all arguments are returned.
+ * @param array|string $args An array of key => value arguments to match against the post type objects.
  * @param string $output The type of output to return, either post type 'names' or 'objects'. 'names' is the default.
+ * @param string $operator The logical operation to perform. 'or' means only one element 
+ *  from the array needs to match; 'and' means all elements must match. The default is 'and'.
  * @return array A list of post type names or objects
  */
-function get_post_types( $args = array(), $output = 'names' ) {
+function get_post_types( $args = array(), $output = 'names', $operator = 'and' ) {
 	global $wp_post_types;
 
-	$do_names = false;
-	if ( 'names' == $output )
-		$do_names = true;
+	$field = ('names' == $output) ? 'name' : false;
 
-	$post_types = array();
-	foreach ( (array) $wp_post_types as $post_type ) {
-		if ( empty($args) ) {
-			if ( $do_names )
-				$post_types[] = $post_type->name;
-			else
-				$post_types[] = $post_type;
-		} elseif ( array_intersect_assoc((array) $post_type, $args) ) {
-			if ( $do_names )
-				$post_types[] = $post_type->name;
-			else
-				$post_types[] = $post_type;
-		}
-	}
-
-	return $post_types;
+	return wp_filter_object_list($wp_post_types, $args, $operator, $field);
 }
 
 /**
Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 14075)
+++ wp-includes/functions.php	(working copy)
@@ -2901,7 +2901,7 @@
  * @param array|string $list
  * @return array Sanitized array of IDs
  */
-function wp_parse_id_list($list) {
+function wp_parse_id_list( $list ) {
 	if ( !is_array($list) )
 		$list = preg_split('/[\s,]+/', $list);
 
@@ -2909,6 +2909,41 @@
 }
 
 /**
+ * Filters a list of objects, based on a set of key => value arguments
+ *
+ * @since 3.0.0
+ *
+ * @param array $list An array of objects to filter
+ * @param array $args An array of key => value arguments to match against each object
+ * @param string $operator The logical operation to perform. 'or' means only one element 
+ *	from the array needs to match; 'and' means all elements must match. The default is 'and'.
+ * @param bool|string $field A field from the object to place instead of the entire object
+ * @return array A list of objects or object fields
+ */
+function wp_filter_object_list( $list, $args = array(), $operator = 'and', $field = false ) {
+	if ( !is_array($list) )
+		return array();
+
+	if ( empty($args) )
+		$args = array();
+
+	if ( empty($args) && !$field )
+		return $list;	// nothing to do
+
+	$count = count($args);
+
+	$filtered = array();
+
+	foreach ( $list as $key => $obj ) {
+		$matched = count(array_intersect_assoc(get_object_vars($obj), $args));
+		if ( ('and' == $operator && $matched == $count) || ('or' == $operator && $matched <= $count) )
+			$filtered[$key] = $field ? $obj->$field : $obj;
+	}
+
+	return $filtered;
+}
+
+/**
  * Determines if default embed handlers should be loaded.
  *
  * Checks to make sure that the embeds library hasn't already been loaded. If
Index: wp-includes/query.php
===================================================================
--- wp-includes/query.php	(revision 14075)
+++ wp-includes/query.php	(working copy)
@@ -2255,7 +2255,7 @@
 
 			if ( is_admin() ) {
 				// Add protected states that should show in the admin all list.
-				$admin_all_states = get_post_stati( array('protected' => true, 'show_in_admin_all_list' => true), 'names', 'and' );
+				$admin_all_states = get_post_stati( array('protected' => true, 'show_in_admin_all_list' => true) );
 				foreach ( (array) $admin_all_states as $state )
 					$where .= " OR $wpdb->posts.post_status = '$state'";
 			}