Ticket #37508: 37508.patch

wp-includes/wp-db.php

@@ -3080 +3080 @@
                 if ( $this->col_info )
                         return;
 
-                if ( $this->use_mysqli ) {
+                if ( $this->use_mysqli && $this->result instanceof mysqli_result ) {
                         $num_fields = mysqli_num_fields( $this->result );
                         for ( $i = 0; $i < $num_fields; $i++ ) {
                                 $this->col_info[ $i ] = mysqli_fetch_field( $this->result );
                         }
-                } else {
+                } elseif ( is_resource( $this->result ) ) {
                         $num_fields = mysql_num_fields( $this->result );
                         for ( $i = 0; $i < $num_fields; $i++ ) {
                                 $this->col_info[ $i ] = mysql_fetch_field( $this->result, $i );