Shows duplicated classes in two folders

intersected_classes.php

<?php
if ($argc != 3) {
    echo 'Usage:', PHP_EOL, "\tphp ", basename($argv[0]), ' <source directory 1> <source directory 2>', PHP_EOL;
    exit(1);
}

function token_get_namespaces($tokens)
{
    $tokens = array_map(
        function ($token) {
            if (is_array($token)) {
                unset($token[2]);
            }
            return $token;
        },
        $tokens
    );

    $namespaces = array();

    foreach (array_keys($tokens, array(T_NAMESPACE, "namespace")) as $index) {
        $namespaces[$index] = implode(
            '',
            array_map(
                function ($token) {
                    return $token[1];
                },
                array_filter(
                    array_slice(
                        $tokens,
                        $index + 1,
                        min(
                            array_search(';', array_slice($tokens, $index + 1)) ? : PHP_INT_MAX,
                            array_search('{', array_slice($tokens, $index + 1)) ? : PHP_INT_MAX
                        )
                    ),
                    function ($token) {
                        return is_array($token) && in_array($token[0], array(T_NS_SEPARATOR, T_STRING));
                    }
                )
            )
        );
    }

    return $namespaces;
}

function token_get_classes($tokens, $namespace = null)
{
    $tokens = array_map(
        function ($token) {
            if (is_array($token)) {
                unset($token[2]);
            }
            return $token;
        },
        $tokens
    );

    $classes = array();

    foreach (array_keys($tokens, array(T_CLASS, "class")) as $index) {
        $classes[$index] = ($namespace ? '\\' . $namespace . '\\' : '') . reset(
                array_map(
                    function ($token) {
                        return $token[1];
                    },
                    array_filter(
                        array_slice(
                            $tokens,
                            $index + 1,
                            array_search('{', array_slice($tokens, $index + 1)) ? : null
                        ),
                        function ($token) {
                            return is_array($token) && $token[0] = T_STRING && trim($token[1]);
                        }
                    )
                )
            );
    }

    return $classes;
}

$classLists = array_map(
    function ($dir) {
        $iterator = new RegexIterator(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($dir)), '/\.php$/i', RecursiveRegexIterator::GET_MATCH);

        $classes = array();
        foreach ($iterator as $phpClassFile => $object) {
            $tokens = token_get_all(file_get_contents($phpClassFile));

            $namespaces = token_get_namespaces($tokens);

            if (!empty($namespaces)) {
                foreach ($namespaces as $index => $namespace) {
                    unset($namespaces[$index]);
                    $classes = array_merge(
                        $classes,
                        token_get_classes(
                            array_slice(
                                $tokens,
                                $index + 1,
                                empty($namespaces) ? null : reset(array_keys($namespaces)) - $index - 2
                            ),
                            $namespace
                        )
                    );
                }
            } else {
                $classes = array_merge($classes, token_get_classes($tokens));
            }
        }

        return $classes;
    },
    array_slice($argv, 1)
);

$intersectedClasses = call_user_func_array('array_intersect', $classLists);

echo implode(PHP_EOL, $intersectedClasses), PHP_EOL;