$projects = id(new PhabricatorProjectQuery())
->setViewer($admin)
->execute();
foreach ($projects as $project) {
print("proj: " . $project->getName() . "\n");
$fields = PhabricatorCustomField::getObjectFields($project, PhabricatorCustomField::ROLE_VIEW)
->setViewer($admin)
->readFieldsFromStorage($project)
->getFields();
$ldap_dn = $fields["std:project:mytest"]->getProxy()->getFieldValue();
print(" std:project:mytest = " . $ldap_dn . "\n");
}