Adldap\Connections\ConnectionInterface::isBound PHP Method

    public function isBound();

 /**
  * {@inheritdoc}
  */
 public function authenticate($username, $password, $preventRebind = false)
 {
     $auth = false;
     try {
         if ($this->configuration->getUseSSO()) {
             // If SSO is enabled, we'll try binding over kerberos
             $remoteUser = $this->getRemoteUserInput();
             $kerberos = $this->getKerberosAuthInput();
             // If the remote user input equals the username we're
             // trying to authenticate, we'll perform the bind
             if ($remoteUser == $username) {
                 $auth = $this->bindUsingKerberos($kerberos);
             }
         } else {
             // Looks like SSO isn't enabled, we'll bind regularly instead
             $auth = $this->bindUsingCredentials($username, $password);
         }
     } catch (AdldapException $e) {
         if ($preventRebind === true) {
             // Binding failed and we're not allowed
             // to rebind, we'll return false
             return $auth;
         }
     }
     // If we're allowed to rebind, we'll rebind as administrator
     if ($preventRebind === false) {
         $adminUsername = $this->configuration->getAdminUsername();
         $adminPassword = $this->configuration->getAdminPassword();
         $this->bindUsingCredentials($adminUsername, $adminPassword);
         if (!$this->connection->isBound()) {
             throw new AdldapException('Rebind to Active Directory failed. AD said: ' . $this->connection->getLastError());
         }
     }
     return $auth;
 }