Loads classes from a folder.

load_classes.php

<?php
/**
* Loads and substantiates all classes in the classes folders
* Classes should be named in the form of Washington_Post_{Class_Name}
* Files should be the name of the class name e.g. class-name.php
* Classes will be autoloaded as $object->{class_name}
*/
function _load_subclasses() {

    // load all core classes
    $files = glob( dirname( __FILE__ ). '/classes/*.php' ) ;

    foreach ( $files as $file ) {

        //don't include self
        if ( basename( $file ) == basename( __FILE__ ) )
            continue;

        //the name of this particular class, e.g., API or Options
        $include = $this->_get_include_object( $file );

        if ( !apply_filters( "{$this->prefix}load_{$include->object_name}", true, $include ) )
            continue;

        if ( !class_exists( $include->class ) )
            @require_once $include->file;

        if ( !class_exists( $include->class ) ) {
            trigger_error( "{$this->name} -- Unable to load class {$include->class}." );
            continue;
        }

        $this->{$include->object_name} = new $include->class( $this );
        $this->classes[ $include->object_name ] = $include->class;

    }

    //do this after all modules have loaded so we know API exists
    foreach ( $this->classes as $name=>$class)
        $this->api->do_action( "{$name}_init" );
}