note 58416 added to function.header

OK, can anyone tell me why I get the error message: Warning: Cannot modify header information - headers already sent by (output started at /Apache/htdocs/getMedia.php:1) in /Apache/Apache/htdocs/getMedia.php on line 1 Wit the script I was playing with that starts like: <?php header("Content-type: " . "image/gif"); construct_image(); : : I wanted to make sure all blank lines and such are gone.... Thanks, Larry ---- Manual Page -- http://www.php.net/manual/en/function.header.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+58416 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+58416&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+58416&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+58416&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+58416&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+58416&report=yes&reason=non-english Delete: already in docs -- http://master.php.net/manage/user-notes.php?action=delete+58416&report=yes&reason=already+in+docs Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+58416&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+58416&report=yes Search -- http://master.php.net/manage/user-notes.php