Remember to use if(fileowner(...) === FALSE) instead of if(!fileowner()) or if(fileowner() == FLASE) because if the owner was "root" it would return 0.(PHP 4, PHP 5, PHP 7, PHP 8)
fileowner — Gets file owner
filenamePath to the file.
Returns the user ID of the owner of the file, or false on failure.
The user ID is returned in numerical format, use
posix_getpwuid() to resolve it to a username.
Upon failure, an E_WARNING is emitted.
Example #1 Finding the owner of a file
<?php
$filename = 'index.php';
print_r(posix_getpwuid(fileowner($filename)));
?>Note: The results of this function are cached. See clearstatcache() for more details.
As of PHP 5.0.0, this function can also be used with some URL wrappers. Refer to Supported Protocols and Wrappers to determine which wrappers support stat() family of functionality.
Remember to use if(fileowner(...) === FALSE) instead of if(!fileowner()) or if(fileowner() == FLASE) because if the owner was "root" it would return 0.Small note: the function resolves symbolic links. That is, if the link is created by user 999 and maps to a file owned by user 666, this function returns 666 :(This function will always return 0 on Windows, because Windows does not support numeric user IDs.