note 58309 added to ref.url

I want to try that a URL is available or not, if it is availabe then I would use the function file_get_content() to get the content of the URL, else if it is non-availabe, or it may reject the robot, I would print an error messege. My problem is, how to exam the URL is vailable or non-availabe?? Thanks a lot. ---- Manual Page -- http://www.php.net/manual/en/ref.url.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+58309 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+58309&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+58309&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+58309&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+58309&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+58309&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+58309&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+58309&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+58309&report=yes Search -- http://master.php.net/manage/user-notes.php