sc00tz1

I'm a complete noob here, but if I have a file executing that is using fopen function (opening file, editing, then closing) on a .php file that other browsers are looking at, what will they see if they access the .php file while fopen is being executed (by cron job on my server) on it? Will the page break? The file being edited and viewed by other browsers is mostly html Any help would be greatly appreciated. Thanks