sspmod_saml_IdP_SQLNameID::get PHP Method

    public static function get($idpEntityId, $spEntityId, $user)
    {
        assert('is_string($idpEntityId)');
        assert('is_string($spEntityId)');
        assert('is_string($user)');
        $store = self::getStore();
        $params = array('_idp' => $idpEntityId, '_sp' => $spEntityId, '_user' => $user);
        $query = 'SELECT _value FROM ' . $store->prefix . '_saml_PersistentNameID WHERE _idp = :_idp AND _sp = :_sp AND _user = :_user';
        $query = $store->pdo->prepare($query);
        $query->execute($params);
        $row = $query->fetch(PDO::FETCH_ASSOC);
        if ($row === FALSE) {
            // No NameID found
            return NULL;
        }
        return $row['_value'];
    }

 /**
  * Get the NameID value.
  *
  * @return string|NULL  The NameID value.
  */
 protected function getValue(array &$state)
 {
     if (!isset($state['saml:NameIDFormat']) || $state['saml:NameIDFormat'] !== $this->format) {
         SimpleSAML_Logger::debug('SQLPersistentNameID: Request did not specify persistent NameID format -  not generating persistent NameID.');
         return NULL;
     }
     if (!isset($state['Destination']['entityid'])) {
         SimpleSAML_Logger::warning('SQLPersistentNameID: No SP entity ID - not generating persistent NameID.');
         return NULL;
     }
     $spEntityId = $state['Destination']['entityid'];
     if (!isset($state['Source']['entityid'])) {
         SimpleSAML_Logger::warning('SQLPersistentNameID: No IdP entity ID - not generating persistent NameID.');
         return NULL;
     }
     $idpEntityId = $state['Source']['entityid'];
     if (!isset($state['Attributes'][$this->attribute]) || count($state['Attributes'][$this->attribute]) === 0) {
         SimpleSAML_Logger::warning('SQLPersistentNameID: Missing attribute ' . var_export($this->attribute, TRUE) . ' on user - not generating persistent NameID.');
         return NULL;
     }
     if (count($state['Attributes'][$this->attribute]) > 1) {
         SimpleSAML_Logger::warning('SQLPersistentNameID: More than one value in attribute ' . var_export($this->attribute, TRUE) . ' on user - not generating persistent NameID.');
         return NULL;
     }
     $uid = array_values($state['Attributes'][$this->attribute]);
     /* Just in case the first index is no longer 0. */
     $uid = $uid[0];
     $value = sspmod_saml_IdP_SQLNameID::get($idpEntityId, $spEntityId, $uid);
     if ($value !== NULL) {
         SimpleSAML_Logger::debug('SQLPersistentNameID: Found persistent NameID ' . var_export($value, TRUE) . ' for user ' . var_export($uid, TRUE) . '.');
         return $value;
     }
     if (!isset($state['saml:AllowCreate']) || !$state['saml:AllowCreate']) {
         SimpleSAML_Logger::warning('SQLPersistentNameID: Did not find persistent NameID for user, and not allowed to create new NameID.');
         throw new sspmod_saml_Error(SAML2_Const::STATUS_RESPONDER, 'urn:oasis:names:tc:SAML:2.0:status:InvalidNameIDPolicy');
     }
     $value = SimpleSAML_Utilities::stringToHex(SimpleSAML_Utilities::generateRandomBytes(20));
     SimpleSAML_Logger::debug('SQLPersistentNameID: Created persistent NameID ' . var_export($value, TRUE) . ' for user ' . var_export($uid, TRUE) . '.');
     sspmod_saml_IdP_SQLNameID::add($idpEntityId, $spEntityId, $uid, $value);
     return $value;
 }