some additional consts

ext/standard/php3_var.h

@@ -37,6 +37,6 @@ PHP_FUNCTION(unserialize);
 
 void php3api_var_dump(pval **struc, int level);
 void php3api_var_serialize(pval *buf, pval **struc);
-int php3api_var_unserialize(pval **rval, char **p, char *max);
+int php3api_var_unserialize(pval **rval, const char **p, const char *max);
 
 #endif /* _PHPVAR_H */

ext/standard/var.c

@@ -288,9 +288,9 @@ void php3api_var_serialize(pval *buf, pval **struc)
 /* }}} */
 /* {{{ php3api_var_dump */
 
-int php3api_var_unserialize(pval **rval, char **p, char *max)
+int php3api_var_unserialize(pval **rval, const char **p, const char *max)
 {
-	char *q;
+	const char *q;
 	char *str;
 	int i;
 
@@ -482,7 +482,7 @@ PHP_FUNCTION(unserialize)
 		WRONG_PARAM_COUNT;
 	}
 	if (buf->type == IS_STRING) {
-		char *p = buf->value.str.val;
+		const char *p = buf->value.str.val;
 		if (!php3api_var_unserialize(&return_value, &p, p + buf->value.str.len)) {
 			RETURN_FALSE;
 		}