function db_field_name($result, $n)
{
    //return mysql_field_name($result, $n);
    $fieldinfo = mysqli_fetch_field_direct($result, $n);
    return $fieldinfo->name;
    
    
}

<?php

/*
 * using mysqli_connect instead of mysql_connect
 */

function set_global_connection($company = -1) {
    global $db, $transaction_level, $db_connections;

    cancel_transaction();
    // cancel all aborted transactions if any
    $transaction_level = 0;

    if ($company == -1) {
        $company = $_SESSION["wa_current_user"]->company;
    }

    $_SESSION["wa_current_user"]->cur_con = $company;

    $connection = $db_connections[$company];
    $db = mysqli_connect($connection["host"], $connection["dbuser"], $connection["dbpassword"]);
    mysqli_select_db($db, $connection["dbname"]);
    return $db;
}

$db_duplicate_error_code = 1062;

//DB wrapper functions to change only once for whole application

function db_query($sql, $err_msg = null) {
    global $db, $show_sql, $sql_trail, $select_trail, $go_debug, $sql_queries, $Ajax, $db_connections, $db_last_inserted_id;

    // set current db prefix
    $cur_prefix = $db_connections[$_SESSION["wa_current_user"]->cur_con]['tbpref'];
    $sql = str_replace(TB_PREF, $cur_prefix, $sql);

    if ($show_sql) {
        $Ajax->activate('footer_debug');
        $sql_queries .= "<pre>$sql</pre>\n<hr>";
    }

    $result = mysqli_query($db, $sql);

    if ($sql_trail) {
        $db_last_inserted_id = mysqli_insert_id($db);
        // preserve in case trail insert is done
        if ($select_trail || (strstr($sql, 'SELECT') === false)) {
            mysqli_query($db, "INSERT INTO " . $cur_prefix . "sql_trail
                (`sql`, `result`, `msg`)
                VALUES(" . db_escape($sql) . "," . ($result ? 1 : 0) . ",
                " . db_escape($err_msg) . ")");
        }
    }

    if ($err_msg != null || $go_debug) {
        $exit = $err_msg != null;
        if (function_exists('xdebug_call_file'))
            check_db_error('<br>At file ' . xdebug_call_file() . ':' . xdebug_call_line() . ':<br>' . $err_msg, $sql, $exit);
        else
            check_db_error($err_msg, $sql, $exit);
    }
    return $result;
}

function db_fetch_row($result) {
    return mysqli_fetch_row($result);
}

function db_fetch_assoc($result) {
    return mysqli_fetch_assoc($result);
}

function db_fetch($result) {
    return mysqli_fetch_array($result);
}

function db_seek(&$result, $record) {
    return mysqli_data_seek($result, $record);
}

function db_free_result($result) {
    if ($result) {
        mysqli_free_result($result);
    }
}

function db_num_rows($result) {
    return mysqli_num_rows($result);
}

function db_num_fields($result) {
    return mysqli_num_fields($result);
}

function db_escape($value = "", $nullify = false) {
    global $db;
    $value = @html_entity_decode($value, ENT_QUOTES, $_SESSION['language']->encoding);
    $value = @htmlspecialchars($value, ENT_QUOTES, $_SESSION['language']->encoding);

    //reset default if second parameter is skipped
    $nullify = ($nullify === null) ? (false) : ($nullify);

    //check for null/unset/empty strings
    if ((!isset($value)) || (is_null($value)) || ($value === "")) {
        $value = ($nullify) ? ("NULL") : ("''");
    } else {
        if (is_string($value)) {

            $value = "'" . mysqli_real_escape_string($db, $value) . "'";
        } else if (!is_numeric($value)) {
            //value is not a string nor numeric
            display_error("ERROR: incorrect data type send to sql query");
            echo '<br><br>';
            exit();
        }
    }
    return $value;
}

function db_error_no() {
    return mysqli_connect_errno();
}

function db_error_msg($db) {
    return mysqli_error($db);
}

function db_insert_id() {
    global $db_last_inserted_id, $sql_trail, $db;
    return $sql_trail ? $db_last_inserted_id : mysqli_insert_id($db);
}

function db_num_affected_rows() {
    global $db;
    return mysqli_affected_rows($db);
}

function db_field_name($result, $n) {
    //return mysqli_field_name($result, $n);
    $fieldinfo = mysqli_fetch_field_direct($result, $n);
    return $fieldinfo->name;
}

function db_create_db($connection) {
    $db = mysqli_connect($connection["host"], $connection["dbuser"], $connection["dbpassword"]);
    if (!mysqli_select_db($db, $connection["dbname"])) {
        $sql = "CREATE DATABASE IF NOT EXISTS " . $connection["dbname"] . "";
        if (!mysqli_query($db, $sql) || !mysqli_select_db($db, $connection["dbname"])) {
            return 0;
        }
    }
    return $db;
}

function db_drop_db($connection) {

    if ($connection["tbpref"] == "") {
        $sql = "DROP DATABASE IF EXISTS " . $connection["dbname"] . "";
        return mysqli_query($db, $sql);
    } else {
        $res = db_query("show table status");
        $all_tables = array();
        while ($row = db_fetch($res)) {
            $all_tables[] = $row;
        }
        // get table structures
        foreach ($all_tables as $table) {
            if (strpos($table['Name'], $connection["tbpref"]) === 0) {
                db_query("DROP TABLE `" . $table['Name'] . "`");
            }
        }
        //deleting the tables, how??
        return true;
    }
}

function db_close($dbase = null) {
    global $db;

    if (!$dbase) {
        $dbase = $db;
    }
    return mysqli_close($dbase);
}

?>

 
function DB_escape_string($String) {
    global $db;
//    return mysqli_real_escape_string($db, htmlspecialchars($String, ENT_COMPAT, 'utf-8', false));
    return mysqli_real_escape_string($db, $String);
}

function db_field_name($result, $n) {
    //return mysqli_field_name($result, $n);
    $fieldinfo = mysqli_fetch_field_direct($result, $n);
    return $fieldinfo->name;
}