Don't cache `WP_Term` objects in `wp_get_object_cache()`.

The data stored in the cache should be raw database query results, not
`WP_Term` objects (which may be modified by plugins, and may contain additional
properties that shouldn't be cached).

If term relationships caches were handled in `wp_get_object_terms()` - where
a database query takes place - it would be straightforward to cache raw data.
See #34239. Since, in fact, `get_the_terms()` caches the value it gets from
`wp_get_object_terms()`, we need a technique that allows us to get raw data
from a `WP_Term` object. Mirroring `WP_User`, we introduce a `data` property
on term objects, which `get_the_terms()` uses to fetch cacheable term info.

Fixes #34262.
Built from https://develop.svn.wordpress.org/trunk@35032


git-svn-id: http://core.svn.wordpress.org/trunk@34997 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/category-template.php

@@ -1137,8 +1137,14 @@ function get_the_terms( $post, $taxonomy ) {
 	$terms = get_object_term_cache( $post->ID, $taxonomy );
 	if ( false === $terms ) {
 		$terms = wp_get_object_terms( $post->ID, $taxonomy );
-		wp_cache_add($post->ID, $terms, $taxonomy . '_relationships');
+		$to_cache = array();
+		foreach ( $terms as $key => $term ) {
+			$to_cache[ $key ] = $term->data;
 		}
+		wp_cache_add( $post->ID, $to_cache, $taxonomy . '_relationships' );
+	}
+
+	$terms = array_map( 'get_term', $terms );
 
 	/**
 	 * Filter the list of terms attached to the given post.

wp-includes/class-wp-term.php

@@ -95,6 +95,15 @@ final class WP_Term {
 	 */
 	public $count = 0;
 
+	/**
+	 * Info about the term, as stored in the database.
+	 *
+	 * @since 4.4.0
+	 * @access protected
+	 * @var array
+	 */
+	protected $data = array();
+
 	/**
 	 * Stores the term object's sanitization level.
 	 *
@@ -157,6 +166,8 @@ final class WP_Term {
 		foreach ( get_object_vars( $term ) as $key => $value ) {
 			$this->$key = $value;
 		}
+
+		$this->data = sanitize_term( $term, $this->taxonomy, $this->filter );
 	}
 
 	/**
@@ -182,4 +193,20 @@ final class WP_Term {
 	public function to_array() {
 		return get_object_vars( $this );
 	}
+
+	/**
+	 * Getter.
+	 *
+	 * @since 4.4.0
+	 * @access public
+	 *
+	 * @return mixed
+	 */
+	public function __get( $key ) {
+		switch ( $key ) {
+			case 'data' :
+				return sanitize_term( $this->{$key}, $this->data->taxonomy, 'raw' );
+				break;
+		}
+	}
 }

wp-includes/taxonomy-functions.php

@@ -3062,7 +3062,7 @@ function wp_update_term( $term_id, $taxonomy, $args = array() ) {
 	$term_id = (int) $term_id;
 
 	// First, get all of the original args
-	$term = get_term( $term_id, $taxonomy, ARRAY_A );
+	$term = get_term( $term_id, $taxonomy );
 
 	if ( is_wp_error( $term ) ) {
 		return $term;
@@ -3072,6 +3072,8 @@ function wp_update_term( $term_id, $taxonomy, $args = array() ) {
 		return new WP_Error( 'invalid_term', __( 'Empty Term' ) );
 	}
 
+	$term = (array) $term->data;
+
 	// Escape data pulled from DB.
 	$term = wp_slash( $term );
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-35031';
+$wp_version = '4.4-alpha-35032';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.