LDAP connection test script

ldap_test.php

<?php

$host = '';
$port = '636';
$ldaps = true;
$version = 3;
$username = '';
$password = '';

if (strpos($host, 'ldaps:') === 0) {
    $host = $host . ':' . $port;
    $connection = ldap_connect($host);
} elseif (true === $ldaps) {
    $host = rtrim('ldaps://' . $host, '/') . ':' . $port;
    $connection = ldap_connect($host);
} else {
    $connection = ldap_connect($host, $port);
}

if (!$connection) {
    fetchErrors($connection);
}

ldap_set_option($connection, LDAP_OPT_REFERRALS, 0);
ldap_set_option($connection, LDAP_OPT_NETWORK_TIMEOUT, 3);

if (null !== $version) {
    if(!ldap_set_option($connection, LDAP_OPT_PROTOCOL_VERSION, $version)) {
        fetchErrors($connection);
    }
}

if (!ldap_bind($connection, $username, $password)) {
    fetchErrors($connection);
}

function getInfo($connection) use ($fullInfo)
{
    $info = [];
    ldap_get_option($connection, LDAP_OPT_DEREF, $info['LDAP_OPT_DEREF']);
    ldap_get_option($connection, LDAP_OPT_SIZELIMIT, $info['LDAP_OPT_SIZELIMIT']);
    ldap_get_option($connection, LDAP_OPT_TIMELIMIT, $info['LDAP_OPT_TIMELIMIT']);
    ldap_get_option($connection, LDAP_OPT_NETWORK_TIMEOUT, $info['LDAP_OPT_NETWORK_TIMEOUT']);
    ldap_get_option($connection, LDAP_OPT_PROTOCOL_VERSION, $info['LDAP_OPT_PROTOCOL_VERSION']);
    ldap_get_option($connection, LDAP_OPT_ERROR_NUMBER, $info['LDAP_OPT_ERROR_NUMBER']);
    ldap_get_option($connection, LDAP_OPT_REFERRALS, $info['LDAP_OPT_REFERRALS']);
    ldap_get_option($connection, LDAP_OPT_RESTART, $info['LDAP_OPT_RESTART']);
    ldap_get_option($connection, LDAP_OPT_HOST_NAME, $info['LDAP_OPT_HOST_NAME']);
    ldap_get_option($connection, LDAP_OPT_ERROR_STRING, $info['LDAP_OPT_ERROR_STRING']);
    ldap_get_option($connection, LDAP_OPT_MATCHED_DN, $info['LDAP_OPT_MATCHED_DN']);
    ldap_get_option($connection, LDAP_OPT_SERVER_CONTROLS, $info['LDAP_OPT_SERVER_CONTROLS']);
    ldap_get_option($connection, LDAP_OPT_CLIENT_CONTROLS, $info['LDAP_OPT_CLIENT_CONTROLS']);
}
function fetchErrors($connection)
{
    $lastErrorCode = ldap_errno($connection);
    $lastErrorMessage = ldap_error($connection);
    if ($lastErrorCode !== 0) {
        getInfo($connection);
        echo "Error [$lastErrorCode]: $lastErrorMessage";
        exit(1);
    }
}