XML-RPC: Avoid a PHP warning in `wp_xmlrpc_server::minimum_args()` if `$args` is not an array.

Correct the documentation to clarify that array is the only acceptable type for `$args`.

Props bitcomplex, dkarfa.
Fixes #48046.
Built from https://develop.svn.wordpress.org/trunk@46148


git-svn-id: http://core.svn.wordpress.org/trunk@45960 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-xmlrpc-server.php

@@ -727,12 +727,12 @@ class wp_xmlrpc_server extends IXR_Server {
 	 *
 	 * @since 3.4.0
 	 *
-	 * @param string|array $args Sanitize single string or array of strings.
-	 * @param int $count         Minimum number of arguments.
+	 * @param array $args  An array of arguments to check.
+	 * @param int   $count Minimum number of arguments.
 	 * @return bool if `$args` contains at least $count arguments.
 	 */
 	protected function minimum_args( $args, $count ) {
-		if ( count( $args ) < $count ) {
+		if ( ! is_array( $args ) || count( $args ) < $count ) {
 			$this->error = new IXR_Error( 400, __( 'Insufficient arguments passed to this XML-RPC method.' ) );
 			return false;
 		}

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-46147';
+$wp_version = '5.3-alpha-46148';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.