Description:
------------
With the last version of PHP5 mysql_fetch_field block and all scripts are timed out.

Reproduce code:
---------------
function PMA_DBI_get_fields_meta($result) {
    $fields       = array();
    $num_fields   = mysql_num_fields($result);
    for ($i = 1; $i < $num_fields; $i++) {
        $fields[] = PMA_convert_display_charset(mysql_fetch_field($result, $i));
    }
    return $fields;
}

Expected result:
----------------
This code come from phpmyadmin and when I execute sql.php file it blocks.

Actual result:
--------------
Script timed out.