Fix #80114: parse_url does not accept URLs with port 0

URIs with a 0 port are generally valid, so `parse_url()` should
recognize such URIs, but still report the port as missing.

Author: cmb69

ext/standard/tests/url/bug80114.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Bug #80114 (parse_url does not accept URLs with port 0)
+--FILE--
+<?php
+var_dump(parse_url('https://example.com:0/'));
+?>
+--EXPECT--
+array(3) {
+  ["scheme"]=>
+  string(5) "https"
+  ["host"]=>
+  string(11) "example.com"
+  ["path"]=>
+  string(1) "/"
+}

ext/standard/url.c

@@ -261,7 +261,7 @@ PHPAPI php_url *php_url_parse_ex(char const *str, size_t length)
 				memcpy(port_buf, p, (e - p));
 				port_buf[e - p] = '\0';
 				port = ZEND_STRTOL(port_buf, NULL, 10);
-				if (port > 0 && port <= 65535) {
+				if ((port > 0 && port <= 65535) || (port == 0 && *port_buf == '0' && e - p == 1)) {
 					ret->port = (unsigned short)port;
 				} else {
 					php_url_free(ret);