Ticket #14781: 14781.3.diff

src/wp-admin/includes/class-wp-upgrader.php

@@ -304 +304 @@
                 if ( $wp_filesystem->is_dir($working_dir) )
                         $wp_filesystem->delete($working_dir, true);
 
-                // Unzip package to working directory
-                $result = unzip_file( $package, $working_dir );
+                $extension = pathinfo($package, PATHINFO_EXTENSION);
+                if ( $extension == 'zip' ) {
+                        // Unzip package to working directory
+                        $result = unzip_file( $package, $working_dir );
 
-                // Once extracted, delete the package if required.
-                if ( $delete_package )
-                        unlink($package);
+                        // Once extracted, delete the package if required.
+                        if ( $delete_package )
+                                unlink($package);
+                } else {
+                        // Create a new folder for the PHP file
+                        mkdir($working_dir);
+
+                        // Copy the PHP file into the new foler
+                        $result = rename($package, $working_dir . '/' . basename($package));
+                }
 
                 if ( is_wp_error($result) ) {
                         $wp_filesystem->delete($working_dir, true);