Ticket #11464: 11464.6.diff

includes/update-core.php

@@ -215 +215 @@
  * @return WP_Error|null WP_Error on failure, null on success.
  */
 function update_core($from, $to) {
-        global $wp_filesystem, $_old_files;
+        global $wp_filesystem, $_old_files, $wpdb;
 
         @set_time_limit( 300 );
 
+        $php_version   = phpversion();
+        $php_compat    = version_compare( $php_version, '4.3', '>=' );
+        $mysql_version = $wpdb->db_version;
+        $mysql_compat  = version_compare( $mysql_version, '4.1.2', '>=' ) || file_exists( WP_CONTENT_DIR . '/db.php' );
+
+        if ( !$mysql_compat || !$php_compat ) {
+                $errors = new WP_Error();
+                if ( !$php_compat )
+                        $errors->add( 'php_not_compatible', sprintf( __('The update cannot be installed because WordPress requires PHP version 4.3 or higher. You are running version %s.'), $php_version ) );
+                if ( !$mysql_compat )
+                        $errors->add( 'mysql_not_compatible', sprintf( __('The update cannot be installed because WordPress requires MySQL version 4.1.2 or higher. You are running version %s.'), $mysql_version ) );
+                return $errors;
+        }
+
         // Sanity check the unzipped distribution
         apply_filters('update_feedback', __('Verifying the unpacked files'));
         if ( !$wp_filesystem->exists($from . '/wordpress/wp-settings.php') || !$wp_filesystem->exists($from . '/wordpress/wp-admin/admin.php') ||