Grouped backports to the 5.8 branch.

- Posts, Post Types: Escape output within `the_meta()`.
- General: Ensure bookmark query limits are numeric.
- Plugins: Escape output in error messages.
- Build/Test Tools: Allow the PHPCS plugin in Composer configuration.

Merges [52412,53958-53960] to the 5.8 branch.
Props tykoted, martinkrcho, xknown, dd32, peterwilsoncc, paulkevan, timothyblynjacobs.

Built from https://develop.svn.wordpress.org/branches/5.8@53965


git-svn-id: http://core.svn.wordpress.org/branches/5.8@53524 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/plugins.php

@@ -610,7 +610,7 @@ if ( ! empty( $invalid ) ) {
 			/* translators: 1: Plugin file, 2: Error message. */
 			__( 'The plugin %1$s has been deactivated due to an error: %2$s' ),
 			'<code>' . esc_html( $plugin_file ) . '</code>',
-			$error->get_error_message()
+			esc_html( $error->get_error_message() )
 		);
 		echo '</p></div>';
 	}
@@ -674,7 +674,7 @@ elseif ( isset( $_GET['deleted'] ) ) :
 				printf(
 					/* translators: %s: Error message. */
 					__( 'Plugin could not be deleted due to an error: %s' ),
-					$delete_result->get_error_message()
+					esc_html( $delete_result->get_error_message() )
 				);
 				?>
 			</p>

wp-includes/bookmark.php

@@ -307,7 +307,7 @@ function get_bookmarks( $args = '' ) {
 	$query .= " $exclusions $inclusions $search";
 	$query .= " ORDER BY $orderby $order";
 	if ( -1 != $parsed_args['limit'] ) {
-		$query .= ' LIMIT ' . $parsed_args['limit'];
+		$query .= ' LIMIT ' . absint( $parsed_args['limit'] );
 	}
 
 	$results = $wpdb->get_results( $query );

wp-includes/post-template.php

@@ -1088,9 +1088,10 @@ function post_custom( $key = '' ) {
  *
  * @since 1.2.0
  *
- * @internal This will probably change at some point...
+ * @deprecated 6.0.2 Use get_post_meta() to retrieve post meta and render manually.
  */
 function the_meta() {
+	_deprecated_function( __FUNCTION__, '6.0.2', 'get_post_meta()' );
 	$keys = get_post_custom_keys();
 	if ( $keys ) {
 		$li_html = '';
@@ -1106,8 +1107,8 @@ function the_meta() {
 			$html = sprintf(
 				"<li><span class='post-meta-key'>%s</span> %s</li>\n",
 				/* translators: %s: Post custom field name. */
-				sprintf( _x( '%s:', 'Post custom field name' ), $key ),
-				$value
+				esc_html( sprintf( _x( '%s:', 'Post custom field name' ), $key ) ),
+				esc_html( $value )
 			);
 
 			/**