PHP-Parser/lib/Node/ClassStmt.php

<?php

class Node_ClassStmt extends NodeAbstract
{
    const MODIFIER_PUBLIC    =  1;
    const MODIFIER_PROTECTED =  2;
    const MODIFIER_PRIVATE   =  4;
    const MODIFIER_STATIC    =  8;
    const MODIFIER_ABSTRACT  = 16;
    const MODIFIER_FINAL     = 32;

    public static function verifyModifier($a, $b) {
        // TODO
    }
}