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    <p>You'll need to use AJAX on top of PHP, as the javascript will process the client side, and the PHP will process the server side. I would suggest using <a href="http://jquery.com" rel="nofollow">jQuery</a> for your <a href="http://api.jquery.com/jQuery.ajax/" rel="nofollow">AJAX</a> calls.</p> <h3>Your workflow would look like this if you were to use PHP and jQuery:</h3> <ol> <li>User types ID in a <code>&lt;input&gt;</code> box in the HTML page</li> <li>User clicks some sort of button, to run the jQuery AJAX function</li> <li>AJAX function takes the ID in the box through <code>$("input").val()</code>, <code>POSTS</code> it to the PHP page</li> <li><p>PHP processes the ID, matches it in the database (or XML file), and <code>json_encode()</code>'s the resulting rows, to look something like this:</p> <p><code>{ "ID": [ { "name": "Banana", "price": "5" } ] }</code></p></li> <li><p>Your PHP code <code>echo()</code>'s the <code>JSON</code> string</p></li> <li><code>onSuccess()</code>, your jQuery parses the JSON through <code>paseJSON()</code></li> <li>You can then access your <code>name</code> and <code>price</code> through something like <code>data["ID"][0]</code> and <code>data["ID")[1]</code></li> <li>Set the <code>.val()</code> of the other <code>&lt;input&gt;</code> elements to that of <code>data["ID"][0]</code> and <code>data["ID"][1]</code></li> </ol> <h3>Pure PHP:</h3> <ol> <li>Output HTML via PHP that includes the same form elements as above</li> <li>When you press submit, <code>POST</code> the values of the <code>ID</code> element to that same PHP file</li> <li>Have your PHP file recognize that the ID is being <code>POST</code>ed to it</li> <li>Match the ID with the ID in your XML file, and retrieve the corresponding rows</li> <li>Set the text of the other <code>input</code> elements to that of the variables retrieved from step 4</li> </ol> <p>Using pure PHP might be a pain, however, if you're going to eventually add the variables, as you'll need a way to retain the previous variables. If you use AJAX, you simply <code>append()</code> the new items to the same HTML page, then create a separate function to add the prices.</p> <p>You could also potentially find a solution without using PHP, and having a javascript library parse the XML file for you.</p>
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    1. COI'm not sure I completely understand... could you provide me with some example code? Thanks!
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    2. CONo, I won't write it for you. What I outlined is all very straightforward, at least in my mind it is. What are you having trouble understanding?
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    3. COLike I said before... I'm VERY new to PHP. I usually learn by reading the actual code. I've never used JSON before, so I don't get what you mean at all! That's why I think an example would help! I'm a visual learner!
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