Fixed bug #51269 (zlib.output_compression Overwrites Vary Header).

NEWS

@@ -6,6 +6,7 @@ PHP                                                                        NEWS
 - Added stream filter support to mcrypt extension (ported from 
   mcrypt_filter). (Stas)
 
+- Fixed bug #51269 (zlib.output_compression Overwrites Vary Header). (Adam)
 - Fixed bug #51257 (CURL_VERSION_LARGEFILE incorrectly used after libcurl
   version 7.10.1). (aron dot ujvari at microsec dot hu)
 - Fixed bug #51242 (Empty mysql.default_port does not default to 3306 anymore,

ext/zlib/tests/bug51269.phpt

@@ -0,0 +1,21 @@
+--TEST--
+Bug #51269 (zlib.output_compression Overwrites Vary Header)
+--INI--
+zlib.output_compression=1
+--ENV--
+HTTP_ACCEPT_ENCODING=gzip
+--SKIPIF--
+<?php 
+if (!extension_loaded("zlib")) die("skip zlib required");
+?>
+--FILE--
+<?php
+header('Vary: Cookie');
+echo 'foo';
+?>
+--EXPECTF--
+%s
+--EXPECTHEADERS--
+Vary: Cookie
+Content-Encoding: gzip
+Vary: Accept-Encoding

ext/zlib/zlib.c

@@ -1056,7 +1056,7 @@ static void php_gzip_output_handler(char *output, uint output_len, char **handle
 						sapi_add_header_ex(ZEND_STRL("Content-Encoding: deflate"), 1, 1 TSRMLS_CC);
 						break;
 				}
-				sapi_add_header_ex(ZEND_STRL("Vary: Accept-Encoding"), 1, 1 TSRMLS_CC);
+				sapi_add_header_ex(ZEND_STRL("Vary: Accept-Encoding"), 1, 0 TSRMLS_CC);
 			} else {
 				/* Disable compression if headers can not be set (Fix for bug #49816) */
 				ZLIBG(output_compression) = 0;