Added test for #77535 fix

Author: pmmaga

ext/curl/tests/bug77535.phpt

@@ -0,0 +1,77 @@
+--TEST--
+Bug #77535 (Invalid callback, h2 server push)
+--SKIPIF--
+<?php
+include 'skipif.inc';
+if (getenv("SKIP_ONLINE_TESTS")) {
+	die("skip online test");
+}
+$curl_version = curl_version();
+if ($curl_version['version_number'] < 0x073d00) {
+	exit("skip: test may crash with curl < 7.61.0");
+}
+?>
+--FILE--
+<?php
+class MyHttpClient
+{
+    private $mh;
+    private $curl;
+
+    public function sendRequest()
+    {
+        if (false === $this->mh = curl_multi_init()) {
+            throw new \RuntimeException('Unable to create a new cURL multi handle');
+        }
+
+        $this->addServerPushCallback();
+
+        $this->curl = curl_init();
+        curl_setopt($this->curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
+        curl_setopt($this->curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
+        curl_setopt($this->curl, CURLOPT_HEADER, false);
+        curl_setopt($this->curl, CURLOPT_RETURNTRANSFER, false);
+        curl_setopt($this->curl, CURLOPT_FAILONERROR, false);
+        curl_setopt($this->curl, CURLOPT_URL, 'https://http2.golang.org/serverpush');
+        curl_setopt($this->curl, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
+        curl_setopt($this->curl, CURLOPT_HEADERFUNCTION, function ($ch, $data) {
+            return \strlen($data);
+        });
+        curl_setopt($this->curl, CURLOPT_WRITEFUNCTION, function ($ch, $data) {
+            return \strlen($data);
+        });
+        curl_multi_add_handle($this->mh, $this->curl);
+        
+        $stillRunning = null;
+        while (true) {
+            do {
+                $mrc = curl_multi_exec($this->mh, $stillRunning);
+            } while (CURLM_CALL_MULTI_PERFORM === $mrc);
+
+            $info = curl_multi_info_read($this->mh);
+            while (false !== $info && $info['msg'] == CURLMSG_DONE) {
+                if (CURLMSG_DONE !== $info['msg']) {
+                    continue;
+                }
+                die("Start handle request.");
+            }
+        }
+    }
+
+    private function addServerPushCallback(): void
+    {
+
+        $callback = static function () {
+            return CURL_PUSH_OK;
+        };
+
+        curl_multi_setopt($this->mh, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
+        curl_multi_setopt($this->mh, CURLMOPT_PUSHFUNCTION, $callback);
+    }
+}
+
+$buzz = new MyHttpClient();
+$buzz->sendRequest();
+--EXPECT--
+Start handle request.
+