root/ext/spl/examples/class_tree.php

DEFINITIONS

1. __construct
2. current

<?php

/** @file   class_tree.php
 * @brief   Class Tree example
 * @ingroup Examples
 * @author  Marcus Boerger
 * @date    2003 - 2008
 * @version 1.1
 *
 * Usage: php class_tree.php \<class\>
 *
 * Simply specify the root class or interface to tree with parameter \<class\>.
 */

if ($argc < 2) {
        echo <<<EOF
Usage: php ${_SERVER['PHP_SELF']} <class>

Displays a graphical tree for the given <class>.

<class> The class or interface for which to generate the tree graph.


EOF;
        exit(1);
}

if (!class_exists("RecursiveTreeIterator", false)) require_once("recursivetreeiterator.inc");

/** \brief Collects sub classes for given class or interface
 */
class SubClasses extends RecursiveArrayIterator
{
        /** @param base  base class to collect sub classes for
         * @param check_interfaces whether we deal with interfaces
         */
        function __construct($base, $check_interfaces = false)
        {
                foreach(get_declared_classes() as $cname)
                {
                        $parent = get_parent_class($cname);
                        if (strcasecmp($parent, $base) == 0)
                        {
                                $this->offsetSet($cname, new SubClasses($cname));
                        }
                        if ($check_interfaces)
                        {
                                if ($parent)
                                {
                                        $parent_imp = class_implements($parent);
                                }
                                foreach(class_implements($cname) as $iname)
                                {
                                        if (strcasecmp($iname, $base) == 0)
                                        {
                                                if (!$parent || !in_array($iname, $parent_imp))
                                                {
                                                        $this->offsetSet($cname, new SubClasses($cname));
                                                }
                                        }
                                }
                        }
                }
                if ($check_interfaces)
                {
                        foreach(get_declared_interfaces() as $cname)
                        {
                                foreach(class_implements($cname) as $iname)
                                {
                                        if (strcasecmp($iname, $base) == 0)
                                        {
                                                $this->offsetSet($cname, new SubClasses($cname, true));
                                        }
                                }
                        }
                }
                $this->uksort('strnatcasecmp');
        }

        /** @return key() since that is the name we need
         */
        function current()
        {
                $result = parent::key();
                $parent = get_parent_class($result);
                if ($parent)
                {
                        $interfaces = array_diff(class_implements($result), class_implements($parent));
                        if ($interfaces)
                        {
                                $implements = array();
                                foreach($interfaces as $interface)
                                {
                                        $implements = array_merge($implements, class_implements($interface));
                                }
                                $interfaces = array_diff($interfaces, $implements);
                                natcasesort($interfaces);
                                $result .= ' (' . join(', ', $interfaces) . ')';
                        }
                }
                return $result;
        }
}

$it = new RecursiveTreeIterator(new SubClasses($argv[1], true));

echo $argv[1]."\n";
foreach($it as $c=>$v)
{
        echo "$v\n";
}