Ticket #25672: 25672.3.diff

src/wp-admin/includes/class-wp-users-list-table.php

@@ -341 +341 @@
         public function single_row( $user_object, $style = '', $role = '', $numposts = 0 ) {
                 global $wp_roles;
 
-                if ( !( is_object( $user_object ) && is_a( $user_object, 'WP_User' ) ) )
+                if ( ! ( is_object( $user_object ) && ( $user_object instanceof WP_User ) ) )
                         $user_object = get_userdata( (int) $user_object );
+
                 $user_object->filter = 'display';
                 $email = $user_object->user_email;
 

src/wp-admin/includes/screen.php

@@ -375 +375 @@
          */
         public static function get( $hook_name = '' ) {
 
-                if ( is_a( $hook_name, 'WP_Screen' ) )
+                if ( $hook_name instanceof WP_Screen )
                         return $hook_name;
 
                 $post_type = $taxonomy = null;

src/wp-admin/includes/template.php

@@ -169 +169 @@
 
         $r = wp_parse_args( $params, $defaults );
 
-        if ( empty( $r['walker'] ) || ! is_a( $r['walker'], 'Walker' ) ) {
+        if ( empty( $r['walker'] ) || ! ( $r['walker'] instanceof Walker ) ) {
                 $walker = new Walker_Category_Checklist;
         } else {
                 $walker = $r['walker'];

src/wp-admin/includes/theme.php

@@ -132 +132 @@
         if ( !isset($themes_update) )
                 $themes_update = get_site_transient('update_themes');
 
-        if ( ! is_a( $theme, 'WP_Theme' ) )
+        if ( ! ( $theme instanceof WP_Theme ) ) {
                 return false;
+        }
 
         $stylesheet = $theme->get_stylesheet();
 

src/wp-includes/Text/Diff/Renderer.php

@@ -83 +83 @@
             /* If these are unchanged (copied) lines, and we want to keep
              * leading or trailing context lines, extract them from the copy
              * block. */
-            if (is_a($edit, 'Text_Diff_Op_copy')) {
+            if ( $edit instanceof Text_Diff_Op_copy ) {
                 /* Do we have any diff blocks yet? */
                 if (is_array($block)) {
                     /* How many lines to keep as context from the copy

src/wp-includes/Text/Diff.php

@@ -74 +74 @@
     {
         $count = 0;
         foreach ($this->_edits as $edit) {
-            if (is_a($edit, 'Text_Diff_Op_add') ||
-                is_a($edit, 'Text_Diff_Op_change')) {
+            if ( ( $edit instanceof Text_Diff_Op_add ) ||
+                ( $edit instanceof Text_Diff_Op_change ) ) {
                 $count += $edit->nfinal();
             }
         }
@@ -93 +93 @@
     {
         $count = 0;
         foreach ($this->_edits as $edit) {
-            if (is_a($edit, 'Text_Diff_Op_delete') ||
-                is_a($edit, 'Text_Diff_Op_change')) {
+            if ( ( $edit instanceof Text_Diff_Op_delete ) ||
+                ( $edit instanceof Text_Diff_Op_change ) ) {
                 $count += $edit->norig();
             }
         }
@@ -137 +137 @@
     function isEmpty()
     {
         foreach ($this->_edits as $edit) {
-            if (!is_a($edit, 'Text_Diff_Op_copy')) {
+            if ( ! ( $edit instanceof Text_Diff_Op_copy ) ) {
                 return false;
             }
         }
@@ -155 +155 @@
     {
         $lcs = 0;
         foreach ($this->_edits as $edit) {
-            if (is_a($edit, 'Text_Diff_Op_copy')) {
+            if ( $edit instanceof Text_Diff_Op_copy ) {
                 $lcs += count($edit->orig);
             }
         }

src/wp-includes/capabilities.php

@@ -509 +509 @@
                         );
                 }
 
-                if ( is_a( $id, 'WP_User' ) ) {
+                if ( $id instanceof WP_User ) {
                         $this->init( $id->data, $blog_id );
                         return;
                 } elseif ( is_object( $id ) ) {

src/wp-includes/category-template.php

@@ -857 +857 @@
 function walk_category_tree() {
         $args = func_get_args();
         // the user's options are the third parameter
-        if ( empty($args[2]['walker']) || !is_a($args[2]['walker'], 'Walker') )
+        if ( empty( $args[2]['walker'] ) || ! $args[2]['walker'] instanceof Walker )
                 $walker = new Walker_Category;
         else
                 $walker = $args[2]['walker'];
@@ -875 +875 @@
 function walk_category_dropdown_tree() {
         $args = func_get_args();
         // the user's options are the third parameter
-        if ( empty($args[2]['walker']) || !is_a($args[2]['walker'], 'Walker') )
+        if ( empty( $args[2]['walker'] ) || ! $args[2]['walker'] instanceof Walker )
                 $walker = new Walker_CategoryDropdown;
         else
                 $walker = $args[2]['walker'];

src/wp-includes/class-IXR.php

@@ -82 +82 @@
         }
 
         // Deal with IXR object types base64 and date
-        if (is_object($this->data) && is_a($this->data, 'IXR_Date')) {
+        if ( is_object( $this->data ) && ( $this->data instanceof IXR_Date ) ) {
             return 'date';
         }
-        if (is_object($this->data) && is_a($this->data, 'IXR_Base64')) {
+        if ( is_object( $this->data ) && ( $this->data instanceof IXR_Base64 ) ) {
             return 'base64';
         }
 
@@ -417 +417 @@
         $result = $this->call($this->message->methodName, $this->message->params);
 
         // Is the result an error?
-        if (is_a($result, 'IXR_Error')) {
+        if ( $result instanceof IXR_Error ) {
             $this->error($result);
         }
 
@@ -564 +564 @@
             } else {
                 $result = $this->call($method, $params);
             }
-            if (is_a($result, 'IXR_Error')) {
+            if ( $result instanceof IXR_Error ) {
                 $return[] = array(
                     'faultCode' => $result->code,
                     'faultString' => $result->message
@@ -1006 +1006 @@
                     break;
                 case 'date':
                 case 'dateTime.iso8601':
-                    if (!is_a($arg, 'IXR_Date')) {
+                    if ( ! ( $arg instanceof IXR_Date ) ) {
                         $ok = false;
                     }
                     break;

src/wp-includes/class-feed.php

@@ -37 +37 @@
         }
 
         public function save($data) {
-                if ( is_a($data, 'SimplePie') )
+                if ( $data instanceof SimplePie ) {
                         $data = $data->data;
+                }
 
-                set_transient($this->name, $data, $this->lifetime);
-                set_transient($this->mod_name, time(), $this->lifetime);
+                set_transient( $this->name, $data, $this->lifetime );
+                set_transient( $this->mod_name, time(), $this->lifetime );
                 return true;
         }
 

src/wp-includes/class-wp-customize-manager.php

@@ -659 +659 @@
          *                                        constructor.
          */
         public function add_setting( $id, $args = array() ) {
-                if ( is_a( $id, 'WP_Customize_Setting' ) )
+                if ( $id instanceof WP_Customize_Setting )
                         $setting = $id;
                 else
                         $setting = new WP_Customize_Setting( $this, $id, $args );
@@ -747 +747 @@
          * @param array                       $args Section arguments.
          */
         public function add_section( $id, $args = array() ) {
-                if ( is_a( $id, 'WP_Customize_Section' ) )
+                if ( $id instanceof WP_Customize_Section )
                         $section = $id;
                 else
                         $section = new WP_Customize_Section( $this, $id, $args );
@@ -789 +789 @@
          *                                          constructor.
          */
         public function add_control( $id, $args = array() ) {
-                if ( is_a( $id, 'WP_Customize_Control' ) )
+                if ( $id instanceof WP_Customize_Control )
                         $control = $id;
                 else
                         $control = new WP_Customize_Control( $this, $id, $args );

src/wp-includes/class-wp-error.php

@@ -255 +255 @@
  * @return bool True, if WP_Error. False, if not WP_Error.
  */
 function is_wp_error($thing) {
-        if ( is_object($thing) && is_a($thing, 'WP_Error') )
+        if ( is_object($thing) && ( $thing instanceof WP_Error ) )
                 return true;
         return false;
 }

src/wp-includes/class-wp-theme.php

@@ -273 +273 @@
                 // Set the parent, if we're a child theme.
                 if ( $this->template != $this->stylesheet ) {
                         // If we are a parent, then there is a problem. Only two generations allowed! Cancel things out.
-                        if ( is_a( $_child, 'WP_Theme' ) && $_child->template == $this->stylesheet ) {
+                        if ( ( $_child instanceof WP_Theme ) && $_child->template == $this->stylesheet ) {
                                 $_child->parent = null;
                                 $_child->errors = new WP_Error( 'theme_parent_invalid', sprintf( __( 'The "%s" theme is not a valid parent theme.' ), $_child->template ) );
                                 $_child->cache_add( 'theme', array( 'headers' => $_child->headers, 'errors' => $_child->errors, 'stylesheet' => $_child->stylesheet, 'template' => $_child->template ) );

src/wp-includes/compat.php

@@ -65 +65 @@
         function json_encode( $string ) {
                 global $wp_json;
 
-                if ( !is_a($wp_json, 'Services_JSON') ) {
+                if ( ! ( $wp_json instanceof Services_JSON ) ) {
                         require_once( ABSPATH . WPINC . '/class-json.php' );
                         $wp_json = new Services_JSON();
                 }
@@ -78 +78 @@
         function json_decode( $string, $assoc_array = false ) {
                 global $wp_json;
 
-                if ( !is_a($wp_json, 'Services_JSON') ) {
+                if ( ! ( $wp_json instanceof Services_JSON ) ) {
                         require_once( ABSPATH . WPINC . '/class-json.php' );
                         $wp_json = new Services_JSON();
                 }

src/wp-includes/deprecated.php

@@ -2689 +2689 @@
         if ( is_object($user) ) {
                 if ( !isset($user->ID) )
                         $user->ID = 0;
-                if ( !is_a( $user, 'WP_User' ) ) {
+                if ( ! ( $user instanceof WP_User ) ) {
                         $vars = get_object_vars($user);
                         foreach ( array_keys($vars) as $field ) {
                                 if ( is_string($user->$field) || is_numeric($user->$field) )

src/wp-includes/functions.wp-scripts.php

@@ -35 +35 @@
                 $handles = false;
 
         global $wp_scripts;
-        if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {
+        if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -72 +72 @@
  */
 function wp_register_script( $handle, $src, $deps = array(), $ver = false, $in_footer = false ) {
         global $wp_scripts;
-        if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {
+        if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -112 +112 @@
  */
 function wp_localize_script( $handle, $object_name, $l10n ) {
         global $wp_scripts;
-        if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {
+        if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -138 +138 @@
  */
 function wp_deregister_script( $handle ) {
         global $wp_scripts;
-        if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {
+        if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -194 +194 @@
  */
 function wp_enqueue_script( $handle, $src = false, $deps = array(), $ver = false, $in_footer = false ) {
         global $wp_scripts;
-        if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {
+        if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -222 +222 @@
  */
 function wp_dequeue_script( $handle ) {
         global $wp_scripts;
-        if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {
+        if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -247 +247 @@
  */
 function wp_script_is( $handle, $list = 'enqueued' ) {
         global $wp_scripts;
-        if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) {
+        if ( ! ( $wp_scripts instanceof WP_Scripts ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

src/wp-includes/functions.wp-styles.php

@@ -34 +34 @@
                 do_action( 'wp_print_styles' );
 
         global $wp_styles;
-        if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {
+        if ( ! ( $wp_styles instanceof WP_Styles ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -67 +67 @@
  */
 function wp_add_inline_style( $handle, $data ) {
         global $wp_styles;
-        if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {
+        if ( ! ( $wp_styles instanceof WP_Styles ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -102 +102 @@
  */
 function wp_register_style( $handle, $src, $deps = array(), $ver = false, $media = 'all' ) {
         global $wp_styles;
-        if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {
+        if ( ! ( $wp_styles instanceof WP_Styles ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -124 +124 @@
  */
 function wp_deregister_style( $handle ) {
         global $wp_styles;
-        if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {
+        if ( ! ( $wp_styles instanceof WP_Styles ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -157 +157 @@
  */
 function wp_enqueue_style( $handle, $src = false, $deps = array(), $ver = false, $media = 'all' ) {
         global $wp_styles;
-        if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {
+        if ( ! ( $wp_styles instanceof WP_Styles ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -183 +183 @@
  */
 function wp_dequeue_style( $handle ) {
         global $wp_styles;
-        if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {
+        if ( ! ( $wp_styles instanceof WP_Styles ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );
@@ -207 +207 @@
  */
 function wp_style_is( $handle, $list = 'enqueued' ) {
         global $wp_styles;
-        if ( ! is_a( $wp_styles, 'WP_Styles' ) ) {
+        if ( ! ( $wp_styles instanceof WP_Styles ) ) {
                 if ( ! did_action( 'init' ) )
                         _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ),
                                 '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' );

src/wp-includes/general-template.php

@@ -2721 +2721 @@
  */
 function wp_admin_css( $file = 'wp-admin', $force_echo = false ) {
         global $wp_styles;
-        if ( !is_a($wp_styles, 'WP_Styles') )
+        if ( ! ( $wp_styles instanceof WP_Styles ) )
                 $wp_styles = new WP_Styles();
 
         // For backward compatibility

src/wp-includes/ms-functions.php

@@ -2037 +2037 @@
  * @return bool
  */
 function is_user_spammy( $user = null ) {
-    if ( ! is_a( $user, 'WP_User' ) ) {
+    if ( ! ( $user instanceof WP_User ) ) {
                 if ( $user )
                         $user = get_user_by( 'login', $user );
                 else

src/wp-includes/pluggable.php

@@ -261 +261 @@
         global $phpmailer;
 
         // (Re)create it, if it's gone missing
-        if ( !is_object( $phpmailer ) || !is_a( $phpmailer, 'PHPMailer' ) ) {
+        if ( !is_object( $phpmailer ) || ! ( $phpmailer instanceof PHPMailer ) ) {
                 require_once ABSPATH . WPINC . '/class-phpmailer.php';
                 require_once ABSPATH . WPINC . '/class-smtp.php';
                 $phpmailer = new PHPMailer( true );

src/wp-includes/post.php

@@ -418 +418 @@
         if ( empty( $post ) && isset( $GLOBALS['post'] ) )
                 $post = $GLOBALS['post'];
 
-        if ( is_a( $post, 'WP_Post' ) ) {
+        if ( $post instanceof WP_Post ) {
                 $_post = $post;
         } elseif ( is_object( $post ) ) {
                 if ( empty( $post->filter ) ) {

src/wp-includes/script-loader.php

@@ -773 +773 @@
                 do_action( 'wp_print_scripts' );
         }
 
-        if ( !is_a($wp_scripts, 'WP_Scripts') )
+        if ( ! ( $wp_scripts instanceof WP_Scripts ) )
                 $wp_scripts = new WP_Scripts();
 
         script_concat_settings();
@@ -803 +803 @@
 function print_footer_scripts() {
         global $wp_scripts, $concatenate_scripts;
 
-        if ( !is_a($wp_scripts, 'WP_Scripts') )
+        if ( ! ( $wp_scripts instanceof WP_Scripts ) )
                 return array(); // No need to run if not instantiated.
 
         script_concat_settings();
@@ -872 +872 @@
 
         global $wp_scripts;
 
-        if ( !is_a($wp_scripts, 'WP_Scripts') )
+        if ( ! ( $wp_scripts instanceof WP_Scripts ) )
                 return array(); // no need to run if nothing is queued
 
         return print_head_scripts();
@@ -927 +927 @@
 function print_admin_styles() {
         global $wp_styles, $concatenate_scripts;
 
-        if ( !is_a($wp_styles, 'WP_Styles') )
+        if ( ! ( $wp_styles instanceof WP_Styles ) )
                 $wp_styles = new WP_Styles();
 
         script_concat_settings();
@@ -957 +957 @@
 function print_late_styles() {
         global $wp_styles, $concatenate_scripts;
 
-        if ( !is_a($wp_styles, 'WP_Styles') )
+        if ( ! ( $wp_styles instanceof WP_Styles ) )
                 return;
 
         $wp_styles->do_concat = $concatenate_scripts;

src/wp-includes/template.php

@@ -135 +135 @@
 
         $templates = array();
 
-        if ( is_a( $author, 'WP_User' ) ) {
+        if ( $author instanceof WP_User  ) {
                 $templates[] = "author-{$author->user_nicename}.php";
                 $templates[] = "author-{$author->ID}.php";
         }

src/wp-includes/user.php

@@ -112 +112 @@
  * @return WP_User|WP_Error WP_User on success, WP_Error on failure.
  */
 function wp_authenticate_username_password($user, $username, $password) {
-        if ( is_a( $user, 'WP_User' ) ) {
+        if ( $user instanceof WP_User  ) {
                 return $user;
         }
 
@@ -167 +167 @@
  * @return WP_User|WP_Error WP_User on success, WP_Error on failure.
  */
 function wp_authenticate_cookie($user, $username, $password) {
-        if ( is_a( $user, 'WP_User' ) ) {
+        if ( $user instanceof WP_User  ) {
                 return $user;
         }
 
@@ -202 +202 @@
  * @return WP_User|WP_Error WP_User on success, WP_Error if the user is considered a spammer.
  */
 function wp_authenticate_spam_check( $user ) {
-        if ( $user && is_a( $user, 'WP_User' ) && is_multisite() ) {
+        if ( $user && ( $user instanceof WP_User ) && is_multisite() ) {
                 /**
                  * Filter whether the user has been marked as a spammer.
                  *
@@ -1636 +1636 @@
 function wp_insert_user( $userdata ) {
         global $wpdb;
 
-        if ( is_a( $userdata, 'stdClass' ) ) {
+        if ( $userdata instanceof stdClass ) {
                 $userdata = get_object_vars( $userdata );
-        } elseif ( is_a( $userdata, 'WP_User' ) ) {
+        } elseif ( $userdata instanceof WP_User ) {
                 $userdata = $userdata->to_array();
         }
         // Are we updating or creating?
@@ -1887 +1887 @@
  * @return int|WP_Error The updated user's ID or a WP_Error object if the user could not be updated.
  */
 function wp_update_user($userdata) {
-        if ( is_a( $userdata, 'stdClass' ) )
+        if ( $userdata instanceof stdClass ) {
                 $userdata = get_object_vars( $userdata );
-        elseif ( is_a( $userdata, 'WP_User' ) )
+        }
+        elseif ( $userdata instanceof WP_User ) {
                 $userdata = $userdata->to_array();
+        }
 
         $ID = (int) $userdata['ID'];
 

src/wp-includes/widgets.php

@@ -1354 +1354 @@
         global $wp_widget_factory;
 
         $widget_obj = $wp_widget_factory->widgets[$widget];
-        if ( !is_a($widget_obj, 'WP_Widget') )
+        if ( ! ( $widget_obj instanceof WP_Widget ) )
                 return;
 
         $before_widget = sprintf('<div class="widget %s">', $widget_obj->widget_options['classname'] );