Description: Enables mod_php to manually add apache output filters
 Author: Paul Querna
 URL: http://www.outoforder.cc/projects/apache/mod_transform/patches/php5-apache2-filters.patch
      http://www.outoforder.cc/presentations/apachecon2004/mod_transform/tu19_mod_transform_slides.pdf
 
diff -Naurp php-5.3.0RC1/sapi/apache2handler/php_functions.c php-5.3.0RC1.oden/sapi/apache2handler/php_functions.c
--- php-5.3.0RC1/sapi/apache2handler/php_functions.c	2009-01-19 20:32:40.000000000 +0100
+++ php-5.3.0RC1.oden/sapi/apache2handler/php_functions.c	2009-03-27 12:08:05.000000000 +0100
@@ -216,6 +216,65 @@ PHP_FUNCTION(apache_response_headers)
 }
 /* }}} */
 
+/* {{{ proto array apache_get_output_filters()
+   Get All Active Output filters */
+PHP_FUNCTION(apache_get_output_filters)
+{
+       ap_filter_t* ff;
+       php_struct *ctx;
+
+       if (ZEND_NUM_ARGS() != 0) {
+               WRONG_PARAM_COUNT;
+       }
+
+       if(array_init(return_value) != SUCCESS)
+       {
+               RETURN_NULL();
+       }
+
+       ctx = SG(server_context);
+
+       ff = ctx->r->output_filters;
+
+       do {
+               add_next_index_string(return_value, ff->frec->name, 1);
+               ff = ff->next ;
+       } while (ff);
+
+}
+/* }}} */
+
+/* {{{ proto bool apache_add_output_filter(string filter_name)
+   Add an output filter to this request */
+PHP_FUNCTION(apache_add_output_filter)
+{
+       php_struct *ctx;
+       int arg_count = ZEND_NUM_ARGS();
+       zval **filter_name;
+       ap_filter_rec_t* ap_filter;
+
+       if (arg_count != 1 ||
+               zend_get_parameters_ex(arg_count, &filter_name) == FAILURE) {
+               WRONG_PARAM_COUNT;
+       }
+
+       ctx = SG(server_context);
+
+       convert_to_string_ex(filter_name);
+
+        ap_filter = ap_get_output_filter_handle(Z_STRVAL_PP(filter_name));
+
+        /* requested output filter was not found */
+       if(ap_filter == NULL) {
+               RETURN_FALSE;
+       }
+       else {
+               ap_add_output_filter_handle(ap_filter, NULL, ctx->r, ctx->r->connection);
+               RETURN_TRUE;
+       }
+}
+/* }}} */
+
 /* {{{ proto string apache_note(string note_name [, string note_value])
    Get and set Apache request notes */
 PHP_FUNCTION(apache_note)
@@ -516,6 +575,8 @@ ZEND_END_ARG_INFO()
 static const zend_function_entry apache_functions[] = {
 	PHP_FE(apache_lookup_uri, 		arginfo_apache2handler_lookup_uri)
 	PHP_FE(virtual, 				arginfo_apache2handler_virtual) 
+ 	PHP_FE(apache_get_output_filters, NULL)
+ 	PHP_FE(apache_add_output_filter, NULL)
 	PHP_FE(apache_request_headers, 	arginfo_apache2handler_getallheaders)
 	PHP_FE(apache_response_headers, arginfo_apache2handler_response_headers)
 	PHP_FE(apache_setenv, 		arginfo_apache2handler_setenv)