diff --git a/wp-admin/upload.php b/wp-admin/upload.php
index e12120701..0f3e5ddac 100644
--- a/wp-admin/upload.php
+++ b/wp-admin/upload.php
@@ -155,36 +155,35 @@ require_once('./admin-header.php');
 <div class="wrap">
 <?php screen_icon(); ?>
 <h2><?php echo esc_html( $title ); ?> <a href="media-new.php" class="add-new-h2"><?php echo esc_html_x('Add New', 'file'); ?></a> <?php
-if ( isset($_REQUEST['s']) && $_REQUEST['s'] )
+if ( ! empty( $_REQUEST['s'] ) )
 	printf( '<span class="subtitle">' . __('Search results for &#8220;%s&#8221;') . '</span>', get_search_query() ); ?>
 </h2>
 
 <?php
 $message = '';
-if ( isset($_GET['posted']) && (int) $_GET['posted'] ) {
+if ( ! empty( $_GET['posted'] ) ) {
 	$message = __('Media attachment updated.');
 	$_SERVER['REQUEST_URI'] = remove_query_arg(array('posted'), $_SERVER['REQUEST_URI']);
 }
 
-if ( isset($_GET['attached']) && (int) $_GET['attached'] ) {
-	$attached = (int) $_GET['attached'];
+if ( ! empty( $_GET['attached'] ) && $attached = absint( $_GET['attached'] ) ) {
 	$message = sprintf( _n('Reattached %d attachment.', 'Reattached %d attachments.', $attached), $attached );
 	$_SERVER['REQUEST_URI'] = remove_query_arg(array('attached'), $_SERVER['REQUEST_URI']);
 }
 
-if ( isset($_GET['deleted']) && (int) $_GET['deleted'] ) {
-	$message = sprintf( _n( 'Media attachment permanently deleted.', '%d media attachments permanently deleted.', $_GET['deleted'] ), number_format_i18n( $_GET['deleted'] ) );
+if ( ! empty( $_GET['deleted'] ) && $deleted = absint( $_GET['deleted'] ) ) {
+	$message = sprintf( _n( 'Media attachment permanently deleted.', '%d media attachments permanently deleted.', $deleted ), number_format_i18n( $_GET['deleted'] ) );
 	$_SERVER['REQUEST_URI'] = remove_query_arg(array('deleted'), $_SERVER['REQUEST_URI']);
 }
 
-if ( isset($_GET['trashed']) && (int) $_GET['trashed'] ) {
-	$message = sprintf( _n( 'Media attachment moved to the trash.', '%d media attachments moved to the trash.', $_GET['trashed'] ), number_format_i18n( $_GET['trashed'] ) );
+if ( ! empty( $_GET['trashed'] ) && $trashed = absint( $_GET['trashed'] ) ) {
+	$message = sprintf( _n( 'Media attachment moved to the trash.', '%d media attachments moved to the trash.', $trashed ), number_format_i18n( $_GET['trashed'] ) );
 	$message .= ' <a href="' . esc_url( wp_nonce_url( 'upload.php?doaction=undo&action=untrash&ids='.(isset($_GET['ids']) ? $_GET['ids'] : ''), "bulk-media" ) ) . '">' . __('Undo') . '</a>';
 	$_SERVER['REQUEST_URI'] = remove_query_arg(array('trashed'), $_SERVER['REQUEST_URI']);
 }
 
-if ( isset($_GET['untrashed']) && (int) $_GET['untrashed'] ) {
-	$message = sprintf( _n( 'Media attachment restored from the trash.', '%d media attachments restored from the trash.', $_GET['untrashed'] ), number_format_i18n( $_GET['untrashed'] ) );
+if ( ! empty( $_GET['untrashed'] ) && $untrashed = absint( $_GET['untrashed'] ) ) {
+	$message = sprintf( _n( 'Media attachment restored from the trash.', '%d media attachments restored from the trash.', $untrashed ), number_format_i18n( $_GET['untrashed'] ) );
 	$_SERVER['REQUEST_URI'] = remove_query_arg(array('untrashed'), $_SERVER['REQUEST_URI']);
 }
 
@@ -194,8 +193,8 @@ $messages[3] = __('Error saving media attachment.');
 $messages[4] = __('Media moved to the trash.') . ' <a href="' . esc_url( wp_nonce_url( 'upload.php?doaction=undo&action=untrash&ids='.(isset($_GET['ids']) ? $_GET['ids'] : ''), "bulk-media" ) ) . '">' . __('Undo') . '</a>';
 $messages[5] = __('Media restored from the trash.');
 
-if ( isset($_GET['message']) && (int) $_GET['message'] ) {
-	$message = $messages[$_GET['message']];
+if ( ! empty( $_GET['message'] ) && isset( $messages[ $_GET['message'] ] ) ) {
+	$message = $messages[ $_GET['message'] ];
 	$_SERVER['REQUEST_URI'] = remove_query_arg(array('message'), $_SERVER['REQUEST_URI']);
 }