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    <p>1) to autoload a library, just add it to the array in the file application/config/autoload.php, look for the 'library' section and paste the name of the library(without extension) there, as an element of the array.</p> <pre><code>$autoload['libraries'] = array ('auth'); </code></pre> <p>2) I suggest you use the native session handler (session library), which works pretty well and avoids you to use php $_SESSION. You set a width <code>$this-&gt;session-&gt;set_userdata(array('username' =&gt; 'User1', 'logged' =&gt; 'true')</code>, and then you retrieve the values with <code>$this-&gt;session-&gt;userdata['logged']</code>, for ex. </p> <p>Works like a charm and don't have to call session_start() and so on. Go check the help because it's really really clear on that.</p> <p>3) As for your problem, I'll go, instead, for 'hooks'. There are different hooks, depending on their 'position', i.e. the moment in which you're calling them. </p> <p>You can use, for ex.. the 'post_controller_constructor', which is called after controller initialization but BEFORE the methods, so it's in a midway between the constructor and the actual method. I usually insert this controls here. </p> <p>You define hooks in application/config/hooks.php, and give them an array: </p> <pre><code> $hook['post_controller_constructor'] = array( 'class' =&gt; 'Auth', 'function' =&gt; 'check', 'filename' =&gt; 'auth.php', filepath' =&gt; 'hooks', 'params' =&gt; array() ); </code></pre> <p>Anyway, for all these needs, the docs are pretty clear and straightforward, I suggest you read about hooks and session and you'll see everything gets much clearer!</p>
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