Mysql php update function problem

How do I create a php code for mysql to do the fallowing?

if active = 1 to do current amount + 2000

id,   eid,       amount,   apply 1,  apply 2,      apply 3,  active
1     1788       500        NULL        NULL        NULL      1
2     1956       1000       NULL        NULL        NULL      1
3     2035       1500       NULL        NULL        NULL      1

And the output to be like this nothing else to change.

id,   eid,       amount,   apply 1,  apply 2,      apply 3开发者_如何学Go,  active
1     1788       2500       NULL        NULL        NULL      1
2     1956       3000       NULL        NULL        NULL      1
3     2035       3500       NULL        NULL        NULL      1

Thanks in front for people who will help

The SQL query is as follows:

UPDATE tablename SET amount=amount+2000 WHERE active=1;

How you execute this in PHP depends on which database driver you're using.

For example, using mysqli:

<?php
$link = mysqli_init();
mysql_real_connect($link, $host, $username, $password, $db_name);
mysqli_query($link, "UPDATE tablename SET amount=amount+2000 WHERE active=1");

<?php
    $host = "host";
    $username= "username";
    $password= "password";
    $db_name= "db_name";
    $link = mysql_connect($host, $username, $password);
    mysql_select_db($db_name, $link);
    mysql_query("UPDATE tablename SET amount=amount+2000 WHERE active=1");
?>