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POFacebook application development 101
 

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  1. POFacebook application development 101
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    <p>I am busy creating my very first Facebook application, and although I have PHP and Javascript experience, I am struggling to understand how the logic of setting up an application for Facebook works.</p> <p>From the bare minimum I understand that I need to:</p> <ol> <li>Setup some opengraph items which appears to be nothing more than some meta tags.</li> <li>I need to include a script as written below just after my body tag:</li> <li>I have to run a script: just below the </li> <li>My HTML requires some code listed below.</li> <li>I can include the Facebook PHP library.</li> </ol> <p>1) What is the purpose of the opengraph meta tags? Does this influence my application at all?</p> <p>2) The script:</p> <pre><code>&lt;!-- Load the Facebook SDK --&gt; &lt;div id="fb-root"&gt;&lt;/div&gt; &lt;script src="http://connect.facebook.net/en_US/all.js"&gt;&lt;/script&gt; &lt;script&gt; // IS IT FAIR TO ASSUME THIS AREA BELOW CREATES THE FACEBOOK OBJECT? window.fbAsyncInit = function() { FB.init({ appId : 'APP ID', // App ID status : true, // check login status cookie : true, // enable cookies to allow the server to access the session oauth : true, // enable OAuth 2.0 xfbml : true // parse XFBML }); }; // WHAT DOES THIS DO? (function(d){ var js, id = 'facebook-jssdk'; if (d.getElementById(id)) {return;} js = d.createElement('script'); js.id = id; js.async = true; js.src = "//connect.facebook.net/en_US/all.js"; d.getElementsByTagName('head')[0].appendChild(js); }(document)); &lt;/script&gt; </code></pre> <p>3) The script (also above). What does this do? Can I assume this works similiar that the jQuery framework and is required for me to load the code above?</p> <pre><code>&lt;script src="http://connect.facebook.net/en_US/all.js"&gt;&lt;/script&gt; </code></pre> <p>4) My HTML tag is changed to the code below. What and why is this required?</p> <pre><code>&lt;html xmlns="http://www.w3.org/1999/xhtml" xmlns:og="http://ogp.me/ns#" xmlns:fb="https://www.facebook.com/2008/fbml"&gt; </code></pre> <p>5) Although I understand the logic behind including the PHP library, what is the difference between the Javascript and PHP library? Does it effectively do the same thing?</p> <p>Sorry for the stupid questions, but in reality, I find Facebook not very user friendly for someone to try get into the application development, as their documentation feels "scattered" and not really up to date? </p>
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    1. COThis is not a question: it's four. You should ask each question separately. You are right that their documentation is not really great.
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    2. COIt's all related. It would make no logical sense if I were to ask the same qeustion as 4 as (some of the code might) be dependant on one another.
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