Backport from 8.5:

Add support for CURLINFO_QUEUE_TIME_T in curl_getinfo() (php#19147)
This patch adds support for the CURLINFO_QUEUE_TIME_T constant in the
curl_getinfo() function when compiled with libcurl >= 8.6.0.

CURLINFO_QUEUE_TIME_T This constant allows retrieving the time (in
microseconds) that the request spent in libcurl’s connection queue
before it was sent.

php@7fb6afb

Author: Appla

ext/curl/curl.stub.php

@@ -3029,6 +3029,13 @@
  * @cvalue CURLAUTH_BEARER
  */
 const CURLAUTH_BEARER = UNKNOWN;
+#if LIBCURL_VERSION_NUM >= 0x080600 /* Available since 8.6.0 */
+/**
+ * @var int
+ * @cvalue CURLINFO_QUEUE_TIME_T
+ */
+const CURLINFO_QUEUE_TIME_T = UNKNOWN;
+#endif
 /**
  * @var int
  * @cvalue CURLINFO_APPCONNECT_TIME_T

ext/curl/curl_arginfo.h

@@ -2748,6 +2748,11 @@ PHP_FUNCTION(curl_getinfo)
 		if (curl_easy_getinfo(ch->cp, CURLINFO_APPCONNECT_TIME_T, &co) == CURLE_OK) {
 			CAAL("appconnect_time_us", co);
 		}
+#if LIBCURL_VERSION_NUM >= 0x080600 /* Available since 8.6.0 */
+		if (curl_easy_getinfo(ch->cp, CURLINFO_QUEUE_TIME_T , &co) == CURLE_OK) {
+			CAAL("queue_time_us", co);
+		}
+#endif
 		if (curl_easy_getinfo(ch->cp, CURLINFO_CONNECT_TIME_T, &co) == CURLE_OK) {
 			CAAL("connect_time_us", co);
 		}

ext/curl/interface.c

@@ -0,0 +1,41 @@
+--TEST--
+Curlinfo CURLINFO_QUEUE_TIME_T
+--EXTENSIONS--
+curl
+--SKIPIF--
+<?php
+$curl_version = curl_version();
+if ($curl_version['version_number'] < 0x080600) die("skip: test works only with curl >= 8.6.0");
+?>
+--FILE--
+<?php
+include 'server.inc';
+
+$host = curl_cli_server_start();
+$port = (int) (explode(':', $host))[1];
+
+$ch = curl_init();
+curl_setopt($ch, CURLOPT_URL, "{$host}/get.inc?test=file");
+curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
+
+$info = curl_getinfo($ch);
+var_dump(isset($info['queue_time_us']));
+var_dump($info['queue_time_us'] === 0); // this is always 0 before executing the transfer
+
+$result = curl_exec($ch);
+
+$info = curl_getinfo($ch);
+var_dump(isset($info['queue_time_us']));
+var_dump(is_int($info['queue_time_us']));
+var_dump(curl_getinfo($ch, CURLINFO_QUEUE_TIME_T) === $info['queue_time_us']);
+var_dump(curl_getinfo($ch, CURLINFO_QUEUE_TIME_T) > 0);
+
+?>
+--EXPECT--
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+