Fix GH-8218: ob_end_clean does not reset Content-Encoding header

The fix for GH-7953 introduced a regression by being to deliberate
adding the respective headers.  These must only be added, if the
handler starts, but is not finalizing.

Closes GH-8353.

Author: cmb69

NEWS

@@ -20,6 +20,10 @@ PHP                                                                        NEWS
   . Fixed bug #77023 (FPM cannot shutdown processes). (Jakub Zelenka)
   . Fixed comment in kqueue remove callback log message. (David Carlier)
 
+- Iconv:
+  . Fixed bug GH-8218 (ob_end_clean does not reset Content-Encoding header).
+    (cmb)
+
 - Intl:
   . Fixed bug GH-8364 (msgfmt_format $values may not support references). (cmb)
 
@@ -36,6 +40,10 @@ PHP                                                                        NEWS
   . Fixed php://temp does not preserve file-position when switched to temporary
     file. (Bernd Holzmüller)
 
+- zlib:
+  . Fixed bug GH-8218 (ob_end_clean does not reset Content-Encoding header).
+    (cmb)
+
 14 Apr 2022, PHP 8.0.18
 
 - Core:

ext/iconv/iconv.c

@@ -311,7 +311,7 @@ static int php_iconv_output_handler(void **nothing, php_output_context *output_c
 			mimetype = SG(default_mimetype) ? SG(default_mimetype) : SAPI_DEFAULT_MIMETYPE;
 		}
 
-		if (mimetype != NULL && (!(output_context->op & PHP_OUTPUT_HANDLER_CLEAN) || (output_context->op & PHP_OUTPUT_HANDLER_START))) {
+		if (mimetype != NULL && (!(output_context->op & PHP_OUTPUT_HANDLER_CLEAN) || ((output_context->op & PHP_OUTPUT_HANDLER_START) && !(output_context->op & PHP_OUTPUT_HANDLER_FINAL)))) {
 			size_t len;
 			char *p = strstr(get_output_encoding(), "//");
 

ext/zlib/zlib.c

@@ -281,7 +281,7 @@ static int php_zlib_output_handler(void **handler_context, php_output_context *o
 		return FAILURE;
 	}
 
-	if (!(output_context->op & PHP_OUTPUT_HANDLER_CLEAN) || (output_context->op & PHP_OUTPUT_HANDLER_START)) {
+	if (!(output_context->op & PHP_OUTPUT_HANDLER_CLEAN) || ((output_context->op & PHP_OUTPUT_HANDLER_START) && !(output_context->op & PHP_OUTPUT_HANDLER_FINAL))) {
 		int flags;
 
 		if (SUCCESS == php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_GET_FLAGS, &flags)) {