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POWhy use set_include_path() in PHP and how to autoload classes from different folders?
 

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  1. POWhy use set_include_path() in PHP and how to autoload classes from different folders?
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    <p>I have a couple questions about the include path in PHP and including files and/or classes. </p> <p>Below is a simple snippet of code where we are setting multiple include paths. I saw this in another project but I am not sure why? </p> <p>I have never had to use <strong>set_include_path()</strong> in any of my projects over the last 5 years or so. </p> <p><strong>Q1)</strong><br> So what exactly is the purpose of setting an include path? I have always just included the path in my include() call. </p> <p><strong>Q2)</strong><br> In the example below it sets more then 1 path. How does this work for including files in multiple locations, i'm confused on the purpose or what it does exactly? </p> <pre><code>&lt;?php // Define App path define('APPLICATION_PATH', realpath('../')); // Build array of 3 different paths $paths = array( APPLICATION_PATH, APPLICATION_PATH . '\com', get_include_path() ); /* Result of array above... Array ( [0] =&gt; E:\Web Server\xampp\htdocs\test [1] =&gt; E:\Web Server\xampp\htdocs\test\com [2] =&gt; .;C:\php5\pear ) */ // Set include path from array above // http://us3.php.net/manual/en/function.set-include-path.php set_include_path(implode(PATH_SEPARATOR, $paths)); ?&gt; </code></pre> <p><strong>Q3)</strong><br> This is slightly different question but still relates to includes. Below is a simple autoload function for classes. I used to have a classes folder and autoload ALL my class files. In my current project, I have a library of classes to autoload like below does, but I then also have another section where I might need to autoload class files from a modules directory. </p> <p>So I will need to autoload my <strong>library classes</strong> located somewhere like this.... </p> <p><strong>root/includes/library/classes/library_class_files.php</strong> </p> <p>+++plus+++ </p> <p>load classes for different modules (account, messages, friends, photos,blogs, forums, etc) located somewhere like this.... </p> <p><strong>root/modules/forums/modules_class_files.php</strong> </p> <p>I might not need to loads class files from the 2 different locations, but if I do, how would I go about doing that? </p> <pre><code>&lt;?php //auto include class files that we need on a per page basis function __autoload($class_name){ include('library/classes/' .$class_name . '.class.php'); } ?&gt; </code></pre>
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