Querying users using Zend_LDAP

user_system.php

<?php

$servers = fetchAllServers();
$users = fetchAllUsers();

foreach ($servers as $server) {
    $keys = 'superkey-string';
    $userSystems = fetchUserSystemsById($server->getId())

    foreach ($userSystems as $userSystem) {
        $user = $users[$userSystem->getUid());
        if ($user['sshkey'] != '') {
            $keys .= '\n' . $user['sshkey'];
        }
    }

    $tmpfname = tempnam("/tmp", "FOO");

    $handle = fopen($tmpfname, "w");
    fwrite($handle, $keys);

    $cmd = sprintf('scp -P %d -i %s %s %s@%s:~/.ssh/authorized_keys',
                   $server->getPort(), '/path/to/private/supersshkey',
                   $tmpfname, $server->getUser(), $server->getIpAddress());
    $output = exec($cmd, $returnData, $returnStatus);
    
    fclose($handle);
    unlink($tmpfname);
}

zend_ldap.php

<?php
$options = array(
    'host' => 'ldap.domain.com',
    'username' => 'CN=guest,OU=users,DC=domain,DC=com',
    'password' => 'secret',
);
$fields = array('displayname', 'uid', 'sshkey');
$ldap = new Zend_Ldap($options);
$users = $ldap->search('(objectCategory=user)',
                       'OU=users,DC=domain,DC=com',
                       Zend_Ldap::SEARCH_SCOPE_SUB,
                       $fields);
foreach ($users as $user) {
   var_dump($user);
}