How to include() all PHP files from a directory?

I realize this is an older post BUT... DON'T INCLUDE YOUR CLASSES... instead use __autoload

function __autoload($class_name) {
    require_once('classes/'.$class_name.'.class.php');
}

$user = new User();

Then whenever you call a new class that hasn't been included yet php will auto fire __autoload and include it for you

this is just a modification of Karsten's code

function include_all_php($folder){
    foreach (glob("{$folder}/*.php") as $filename)
    {
        include $filename;
    }
}

include_all_php("my_classes");

Here is the way I include lots of classes from several folders in PHP 5. This will only work if you have classes though.

/*Directories that contain classes*/
$classesDir = array (
    ROOT_DIR.'classes/',
    ROOT_DIR.'firephp/',
    ROOT_DIR.'includes/'
);
function __autoload($class_name) {
    global $classesDir;
    foreach ($classesDir as $directory) {
        if (file_exists($directory . $class_name . '.php')) {
            require_once ($directory . $class_name . '.php');
            return;
        }
    }
}

foreach (glob("classes/*.php") as $filename)
{
    include $filename;
}