note 125189 added to function.posix-seteuid

if you want to set uid by username rather than uid, try combining it with posix_getpwnam(), <?php posix_seteuid (posix_getpwnam("www-data")["uid"]); posix_setegid(posix_getpwnam("www-data")["gid"]); ?> note that posix_getpwnam() reads /etc/passwd on each invocation, if you need it to go fast, this should be faster (only read passwd once): <?php $posix_user_info=posix_getpwnam("www-data"); posix_seteuid ($posix_user_info["uid"]); posix_setegid($posix_user_info["gid"]); ?> and to go back to being root, just set them to 0, <?php posix_seteuid(0); posix_setegid(0); ?> ---- Server IP: 45.112.84.4 Probable Submitter: 103.51.166.36 (proxied: 80.203.134.84) ---- Manual Page -- http://php.net/manual/en/function.posix-seteuid.php Edit -- https://master.php.net/note/edit/125189 Del: integrated -- https://master.php.net/note/delete/125189/integrated Del: useless -- https://master.php.net/note/delete/125189/useless Del: bad code -- https://master.php.net/note/delete/125189/bad+code Del: spam -- https://master.php.net/note/delete/125189/spam Del: non-english -- https://master.php.net/note/delete/125189/non-english Del: in docs -- https://master.php.net/note/delete/125189/in+docs Del: other reasons-- https://master.php.net/note/delete/125189 Reject -- https://master.php.net/note/reject/125189 Search -- https://master.php.net/manage/user-notes.php