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(PHP 4, PHP 5)
posix_geteuid — Return the effective user ID of the current process
Return the numeric effective user ID of the current process. See also posix_getpwuid() for information on how to convert this into a useable username.
Returns the user id, as an integer
Example #1 posix_geteuid() example
This example will show the current user id then set the effective user id to a separate id using posix_seteuid() , then show the difference between the real id and the effective id.
<?php
echo posix_getuid (). "\n" ; //10001
echo posix_geteuid (). "\n" ; //10001
posix_seteuid ( 10000 );
echo posix_getuid (). "\n" ; //10001
echo posix_geteuid (). "\n" ; //10000
?>