Advice on converting asp to php

[colinod]

I am trying to convert my site to php from classic asp by teaching myself. i use session variables for a shopping cart type of effect on the site and the following asp code setermines the session variable and what to add to it.

<%
if InStr(session("recordsInCart"), ","&request.form("recordNum")) = 0 then 
   session("recordsInCart") = session("recordsInCart") + request.form("recordNum") &","
else 
   'do nothing
end if 
%>

can anyone advise on how to change this to php

thanks

colin

[Atli]

In PHP, to use a session variable you must first call the session_start function. This must be done before ANY output is generated; before any HTML in the page, and before any print or echo statements in PHP.

Then you can use $_SESSION["name"] to access a session variable named "name".

To access form data, you either use $_GET or $_POST, depending on the protocol used. For instance, in a POST form, accessing a "recordNum" field would be done like: $_POST["recordNum"].

To find out if a variable, or array element, is set, you can use the isset function. To find out if a variable or array element is set and has a non-empty value, use the empty function.

if (isset($_POST["number"])) {
    // It is set to something.
}

if (!empty($_POST["number"])) {
    // It is set AND it is not empty.
}

if (!empty($_POST["number]) && is_numeric($_POST["number)) {
    // It is set AND it has a numeric value.
}