Ticket #39783: 39783.diff

src/wp-includes/class-wp-http-requests-hooks.php

@@ -54 +54 @@
                 switch ( $hook ) {
                         case 'curl.before_send':
                                 /** This action is documented in wp-includes/class-wp-http-curl.php */
-                                do_action_ref_array( 'http_api_curl', array( $parameters[0], $this->request, $this->url ) );
+                                do_action_ref_array( 'http_api_curl', array( &$parameters[0], $this->request, $this->url ) );
                                 break;
                 }
 

tests/phpunit/tests/http/curl.php

@@ -8 +8 @@
  */
 class Tests_HTTP_curl extends WP_HTTP_UnitTestCase {
         var $transport = 'curl';
+
+        /**
+         * @ticket 39783
+         */
+        public function test_http_api_curl_stream_parameter_is_a_reference() {
+                add_action( 'http_api_curl', array( $this, '_action_test_http_api_curl_stream_parameter_is_a_reference' ), 10, 3 );
+                wp_remote_request( $this->fileStreamUrl, array( 'stream' => true, 'timeout' => 30 ) );
+                remove_action( 'http_api_curl', array( $this, '_action_test_http_api_curl_stream_parameter_is_a_reference' ), 10 );
+        }
+
+        public function _action_test_http_api_curl_stream_parameter_is_a_reference( &$stream, $r, $url ) {
+                // $stream not being a reference will cause a PHP warning
+        }
 }