Serialize a column in mysql php -

Serialize a column in mysql php -

i want serialize column in database named hpriority. using next mysql in php code, apparently statement wrong gives me syntax error:

$hpriorityqueryupdate = mysql_query (" set @counter = 0; update hcontactinfo (@counter := @counter +1) hpr set hpriority = hpr (htype ='$htype') ");

thanks ur help :)

php mysql