fix(ldap): pagination for PHP 7.4 & 8.0

Nek- · Nek- · commit ec99d01edcbb · 2020-10-29T00:53:18.000+01:00
After PR symfony#38392 there is a little issue in the Symfony code base that occurs only for PHP 7.4 and PHP 8.0. This is related to issue symfony#38874
diff --git a/src/Symfony/Component/Ldap/Adapter/ExtLdap/Query.php b/src/Symfony/Component/Ldap/Adapter/ExtLdap/Query.php
@@ -174,8 +174,7 @@ public function getResources(): array
     private function resetPagination()
     {
         $con = $this->connection->getResource();
-        $this->controlPagedResultResponse($con, 0, '');
-        $this->serverctrls = [];
+        $this->controlPagedResultResponse($con, null, '');
 
         // This is a workaround for a bit of a bug in the above invocation
         // of ldap_control_paged_result. Instead of indicating to extldap that
@@ -227,7 +226,7 @@ private function controlPagedResult($con, int $pageSize, string $cookie): bool
      * Retrieve LDAP pagination cookie.
      *
      * @param resource $con
-     * @param resource $result
+     * @param resource|null $result
      */
     private function controlPagedResultResponse($con, $result, string $cookie = ''): string
     {
@@ -236,6 +235,13 @@ private function controlPagedResultResponse($con, $result, string $cookie = ''):
 
             return $cookie;
         }
+
+        if ($result === 0) {
+            $this->serverctrls = [];
+
+            return;
+        }
+
         ldap_parse_result($con, $result, $errcode, $matcheddn, $errmsg, $referrals, $controls);
 
         return $controls[\LDAP_CONTROL_PAGEDRESULTS]['value']['cookie'] ?? '';
