main: convert output_handler global to zend_string*

This prevents a reallocation

Author: Girgias

main/main.c

@@ -819,7 +819,7 @@ PHP_INI_BEGIN()
 	STD_PHP_INI_BOOLEAN("report_memleaks",		"1",		PHP_INI_ALL,		OnUpdateReportMemleaks,	report_memleaks,		php_core_globals,	core_globals)
 	STD_PHP_INI_BOOLEAN("report_zend_debug",	"0",		PHP_INI_ALL,		OnUpdateBool,			report_zend_debug,		php_core_globals,	core_globals)
 	STD_PHP_INI_ENTRY("output_buffering",		"0",		PHP_INI_PERDIR|PHP_INI_SYSTEM,	OnUpdateLong,	output_buffering,		php_core_globals,	core_globals)
-	STD_PHP_INI_ENTRY("output_handler",			NULL,		PHP_INI_PERDIR|PHP_INI_SYSTEM,	OnUpdateString,	output_handler,		php_core_globals,	core_globals)
+	STD_PHP_INI_ENTRY("output_handler",			NULL,		PHP_INI_PERDIR|PHP_INI_SYSTEM,	OnUpdateStrNotEmpty,	output_handler,		php_core_globals,	core_globals)
 	STD_PHP_INI_BOOLEAN("register_argc_argv",	"0",		PHP_INI_PERDIR|PHP_INI_SYSTEM,	OnUpdateBool,	register_argc_argv,		php_core_globals,	core_globals)
 	STD_PHP_INI_BOOLEAN("auto_globals_jit",		"1",		PHP_INI_PERDIR|PHP_INI_SYSTEM,	OnUpdateBool,	auto_globals_jit,	php_core_globals,	core_globals)
 	STD_PHP_INI_BOOLEAN("short_open_tag",	DEFAULT_SHORT_OPEN_TAG,	PHP_INI_SYSTEM|PHP_INI_PERDIR,		OnUpdateBool,			short_tags,				zend_compiler_globals,	compiler_globals)
@@ -1915,10 +1915,10 @@ zend_result php_request_startup(void)
 			sapi_add_header(SAPI_PHP_VERSION_HEADER, sizeof(SAPI_PHP_VERSION_HEADER)-1, 1);
 		}
 
-		if (PG(output_handler) && PG(output_handler)[0]) {
+		if (PG(output_handler)) {
 			zval oh;
 
-			ZVAL_STRING(&oh, PG(output_handler));
+			ZVAL_STR_COPY(&oh, PG(output_handler));
 			php_output_start_user(&oh, 0, PHP_OUTPUT_HANDLER_STDFLAGS);
 			zval_ptr_dtor(&oh);
 		} else if (PG(output_buffering)) {

main/php_globals.h

@@ -65,7 +65,7 @@ struct _php_core_globals {
 	bool ignore_repeated_source;
 	bool report_memleaks;
 
-	char *output_handler;
+	zend_string *output_handler;
 
 	zend_string *unserialize_callback_func;
 	zend_long serialize_precision;