Add entropy when observer extension enabled

Author: SammyK

Zend/zend_system_id.c

@@ -18,6 +18,7 @@
 #include "php.h"
 #include "zend_system_id.h"
 #include "zend_extensions.h"
+#include "zend_observer.h"
 #include "ext/standard/md5.h"
 #include "ext/hash/php_hash.h"
 
@@ -59,6 +60,7 @@ void zend_startup_system_id(void)
 #define ZEND_HOOK_COMPILE_FILE     (1 << 1)
 #define ZEND_HOOK_EXECUTE_EX       (1 << 2)
 #define ZEND_HOOK_EXECUTE_INTERNAL (1 << 3)
+#define ZEND_HOOK_OBSERVER         (1 << 4)
 
 void zend_finalize_system_id(void)
 {
@@ -78,6 +80,9 @@ void zend_finalize_system_id(void)
 	if (zend_execute_internal) {
 		hooks |= ZEND_HOOK_EXECUTE_INTERNAL;
 	}
+	if (ZEND_OBSERVER_ENABLED) {
+		hooks |= ZEND_HOOK_OBSERVER;
+	}
 	PHP_MD5Update(&context, &hooks, sizeof(zend_uchar));
 
 	for (; i < 256; i++) {