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POPHP OOP :: passing session key between classes
 

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    <p>I am trying to work out the most appropriate design to pass a session key between classes in PHP 5.3.</p> <p>The session key is retrieved from a 3rd-party API and my application makes various API calls that all require this session key to be passed in.</p> <p>I have created classes to hold related API calls e.g.Class cart holds methods that, when called, will fire off request to the API to return data from calls such as API_GetCart(), API_AddItem() etc.</p> <p>I am storing the session key in a single cookie (the only cookie that is ever required) and need to make the value of that cookie available to pretty much all of my classes. I cannot use a database or $_SESSION to hold session data. The 3rd-party API looks after session management for things like basket contents etc.</p> <p>When a user reaches my app for the very first time there will be no cookie value so I need to be able to both assign a new session key to a new cookie and also pass that value (not yet available as a cookie since we're still processing the same HTTP request) to the other classes.</p> <p>One idea I had was to create a Session class like this, and put the session grabbing/checking code in the constructor.</p> <pre><code>class Session { public $sk; function __construct() { //code to check if user has sessionkey (sk) in cookie //if not, grab new sessionkey from 3rd party API and assign to new cookie // $sk = 'abcde12345'; //example $sk value } } </code></pre> <p>Then on all view pages I would instantiate a new instance of Session and then pass that object into each class that requires it (nearly all do), either as argument to class constructor or as method argument. </p> <h2> orderSummary.php</h2> <pre><code>$s = new Session; //$s currently would only hold one variable, $sk = "abcde12345" //but in the future may hold more info or perform more work // what is best approach to making the sessionkey // available to all classes? arg to constructor or method... or neither :) $basket = new Basket; $baskSumm = $basket-&gt;getBasketSummary(); $billing = new Billing; $billSumm = $billing-&gt;getBillingSummary(); $delivery = new Delivery; $delSumm = $delivery-&gt;getDeliverySummary(); //code to render as HTML the customer's basket details //as well as their billing and delivery details </code></pre> <p>Is creating a Session class (that really only holds a single value) the best idea? Given that it may need to hold more values and perform more checking, it felt 'right' making it a class. In terms of passing that value to the various classes, would it be best to pass in the Session object to their constructor, e.g.</p> <pre><code>$se = new Session; $basket = new Basket($se); $baskSumm = $basket-&gt;getBasketSummary(); </code></pre> <p>I'm new to OOP so some guidance would be very much appreciated.</p>
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