LdapAuth php

example.php

<?php
$ldap = new LdapAuth('ldap://10.10.10.10');
if($ldap->auth($_POST['username'],$_POST['password'], 'example.local') === true){
    echo 'Access granted';
}

LdapAuth.php

<?php
/**
 * LDAP Auth Handler
 */
class LdapAuth
{
    /**
     * @var false|resource
     */
    private $handle;

    /**
     * @param string $server
     */
    public function __construct(string $server='')
    {
        $this->handle = ldap_connect($server);
        ldap_set_option($this->handle, LDAP_OPT_PROTOCOL_VERSION, 3);
        ldap_set_option($this->handle, LDAP_OPT_REFERRALS, 0);
    }

    /**
     * @param string $userName
     * @param string $password
     * @param string $domainSuffix e.g. example.local
     * @return bool
     */
    public function auth(string $userName, string $password, string $domainSuffix): bool
    {

        $bind = ldap_bind($this->handle, $userName . '@' . $domainSuffix, $password);
        return $bind === true;
    }
}