diff --git a/wp-admin/import/blogger.php b/wp-admin/import/blogger.php
index a24c6853575..140d8f2bbd7 100644
--- a/wp-admin/import/blogger.php
+++ b/wp-admin/import/blogger.php
@@ -770,7 +770,7 @@ function start() {
 				$this->$key = $value;
 
 		if ( isset( $_REQUEST['blog'] ) ) {
-			$blog = is_array($_REQUEST['blog']) ? array_shift( array_keys( $_REQUEST['blog'] ) ) : $_REQUEST['blog'];
+			$blog = is_array($_REQUEST['blog']) ? array_shift( $keys = array_keys( $_REQUEST['blog'] ) ) : $_REQUEST['blog'];
 			$blog = (int) $blog;
 			$result = $this->import_blog( $blog );
 			if ( is_wp_error( $result ) )
diff --git a/wp-admin/widgets.php b/wp-admin/widgets.php
index 4a8751d1590..3438311868e 100644
--- a/wp-admin/widgets.php
+++ b/wp-admin/widgets.php
@@ -18,7 +18,7 @@
 	$sidebar = attribute_escape( $_GET['sidebar'] );
 } elseif ( is_array($wp_registered_sidebars) && !empty($wp_registered_sidebars) ) {
 	// By default we look at the first defined sidebar
-	$sidebar = array_shift( array_keys($wp_registered_sidebars) );
+	$sidebar = array_shift( $keys = array_keys($wp_registered_sidebars) );
 } else {
 	// If no sidebars, die.
 	require_once( 'admin-header.php' );
diff --git a/wp-includes/post.php b/wp-includes/post.php
index d006b59f942..5447a7261ee 100644
--- a/wp-includes/post.php
+++ b/wp-includes/post.php
@@ -2425,7 +2425,7 @@ function wp_mime_type_icon( $mime = 0 ) {
 			$dirs = apply_filters( 'icon_dirs', array($icon_dir => $icon_dir_uri) );
 			$icon_files = array();
 			while ( $dirs ) {
-				$dir = array_shift(array_keys($dirs));
+				$dir = array_shift($keys = array_keys($dirs));
 				$uri = array_shift($dirs);
 				if ( $dh = opendir($dir) ) {
 					while ( false !== $file = readdir($dh) ) {