General: Remove a few `is_object()` checks followed by `instanceof` operator.

This is a minor performance enhancement:

* If an object is passed, the call to `is_object()` will be redundant.
* If a non-object is passed, the `instanceof` operator (a variant of `is_a()`) will first [https://github.com/php/php-src/blob/f42992f/Zend/zend_builtin_functions.c#L630-L631 check if it is an object] before doing any further processing.

Therefore, no additional processing cycles should be wasted in both cases.

Follow-up to [6779], [48798], [48905], [49194], [55748].

Props Presskopp, costdev.
Fixes #58309.
Built from https://develop.svn.wordpress.org/trunk@55757


git-svn-id: http://core.svn.wordpress.org/trunk@55269 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-pclzip.php

@@ -1170,8 +1170,8 @@
     // ----- Reset the error handler
     $this->privErrorReset();
 
-    // ----- Look if the $p_archive is a PclZip object
-    if (is_object($p_archive) && $p_archive instanceof pclzip)
+    // ----- Look if the $p_archive is an instantiated PclZip object
+    if ($p_archive instanceof pclzip)
     {
 
       // ----- Duplicate the archive
@@ -1234,8 +1234,8 @@
       return(0);
     }
 
-    // ----- Look if the $p_archive_to_add is a PclZip object
-    if (is_object($p_archive_to_add) && $p_archive_to_add instanceof pclzip)
+    // ----- Look if the $p_archive_to_add is an instantiated PclZip object
+    if ($p_archive_to_add instanceof pclzip)
     {
 
       // ----- Merge the archive

wp-includes/media.php

@@ -3748,8 +3748,8 @@ function get_taxonomies_for_attachments( $output = 'names' ) {
  * Determines whether the value is an acceptable type for GD image functions.
  *
  * In PHP 8.0, the GD extension uses GdImage objects for its data structures.
- * This function checks if the passed value is either a resource of type `gd`
- * or a GdImage object instance. Any other type will return false.
+ * This function checks if the passed value is either a GdImage object instance
+ * or a resource of type `gd`. Any other type will return false.
  *
  * @since 5.6.0
  *
@@ -3758,8 +3758,8 @@ function get_taxonomies_for_attachments( $output = 'names' ) {
  *              false otherwise.
  */
 function is_gd_image( $image ) {
-	if ( is_resource( $image ) && 'gd' === get_resource_type( $image )
-		|| is_object( $image ) && $image instanceof GdImage
+	if ( $image instanceof GdImage
+		|| is_resource( $image ) && 'gd' === get_resource_type( $image )
 	) {
 		return true;
 	}

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.3-alpha-55756';
+$wp_version = '6.3-alpha-55757';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.