problem with php error log files

Hi, when using su_php i experienced a problem where php error log files didnt rotated after reaching 2MB (set in php.ini). I've recently moved to php-fpm for all accounts and php error files, now located in /home/user/logs/domain_ext.php.error.log are getting very large (size of GB, due to warnings logging) and do not get rotated. Is there a way to keep them at max X mb ? Best regards,