fix: http_build_query(): Passing null to parameter #2 ($numeric_prefi…

…x) of type string is deprecated

src/OpenIDConnectClient.php

@@ -307,11 +307,11 @@ public function authenticate() {
                 throw new OpenIDConnectClientException('Got response: ' . $token_json->error);
             }
 
-	        // Sometime getState() return an empty string
+            // Sometime getState() return an empty string
             // and the authentication process fail
             if ($this->getState() == "")
                 $this->setState($_REQUEST['state']);
-
+            
             // Do an OpenID Connect session check
             if ($_REQUEST['state'] !== $this->getState()) {
                 throw new OpenIDConnectClientException('Unable to determine state');
@@ -350,7 +350,7 @@ public function authenticate() {
                 $this->setNonce($claims->nonce);
                 user_error('Warning: Function getNonce return empty, setting in the session!');
             };
-
+            
             // If this is a valid claim
             if ($this->verifyJWTclaims($claims, $token_json->access_token)) {
 
@@ -467,7 +467,7 @@ public function signOut($enduserIdentification, $redirect, $method = "id_token_h
                 'post_logout_redirect_uri' => $redirect);
         }
 
-        $signout_endpoint  .= (strpos($signout_endpoint, '?') === false ? '?' : '&') . http_build_query( $signout_params, null, '&', $this->enc_type);
+        $signout_endpoint  .= (strpos($signout_endpoint, '?') === false ? '?' : '&') . http_build_query( $signout_params, '', '&', $this->enc_type);
         $this->redirect($signout_endpoint);
     }
 
@@ -692,7 +692,7 @@ private function requestAuthorization() {
             ));
         }
 
-        $auth_endpoint .= (strpos($auth_endpoint, '?') === false ? '?' : '&') . http_build_query($auth_params, null, '&', $this->enc_type);
+        $auth_endpoint .= (strpos($auth_endpoint, '?') === false ? '?' : '&') . http_build_query($auth_params, '', '&', $this->enc_type);
 
         $this->commitSession();
         $this->redirect($auth_endpoint);
@@ -718,7 +718,7 @@ public function requestClientCredentialsToken() {
         );
 
         // Convert token params to string format
-        $post_params = http_build_query($post_data, null, '&', $this->enc_type);
+        $post_params = http_build_query($post_data, '', '&', $this->enc_type);
 
         return json_decode($this->fetchURL($token_endpoint, $post_params, $headers));
     }
@@ -753,7 +753,7 @@ public function requestResourceOwnerToken($bClientAuth =  FALSE) {
         }
 
         // Convert token params to string format
-        $post_params = http_build_query($post_data, null, '&', $this->enc_type);
+        $post_params = http_build_query($post_data, '', '&', $this->enc_type);
 
         return json_decode($this->fetchURL($token_endpoint, $post_params, $headers));
     }
@@ -799,7 +799,7 @@ protected function requestTokens($code) {
         }
 
         // Convert token params to string format
-        $token_params = http_build_query($token_params, null, '&', $this->enc_type);
+        $token_params = http_build_query($token_params, '', '&', $this->enc_type);
 
         $this->tokenResponse = json_decode($this->fetchURL($token_endpoint, $token_params, $headers));
 
@@ -826,7 +826,7 @@ public function refreshToken($refresh_token) {
         );
 
         // Convert token params to string format
-        $token_params = http_build_query($token_params, null, '&', $this->enc_type);
+        $token_params = http_build_query($token_params, '', '&', $this->enc_type);
 
         $json = json_decode($this->fetchURL($token_endpoint, $token_params));
 
@@ -1441,7 +1441,7 @@ public function introspectToken($token, $token_type_hint = '', $clientId = null,
         $clientSecret = $clientSecret !== null ? $clientSecret : $this->clientSecret;
 
         // Convert token params to string format
-        $post_params = http_build_query($post_data, null, '&');
+        $post_params = http_build_query($post_data, '', '&');
         $headers = ['Authorization: Basic ' . base64_encode(urlencode($clientId) . ':' . urlencode($clientSecret)),
             'Accept: application/json'];
 
@@ -1472,7 +1472,7 @@ public function revokeToken($token, $token_type_hint = '', $clientId = null, $cl
         $clientSecret = $clientSecret !== null ? $clientSecret : $this->clientSecret;
 
         // Convert token params to string format
-        $post_params = http_build_query($post_data, null, '&');
+        $post_params = http_build_query($post_data, '', '&');
         $headers = ['Authorization: Basic ' . base64_encode(urlencode($clientId) . ':' . urlencode($clientSecret)),
             'Accept: application/json'];