PHP: fileperms

Description

int fileperms ( string filename )

Returns the permissions on the file, or FALSE in case of an error.

Note: The results of this function are cached. See clearstatcache() for more details.

Tip: As of PHP 5.0.0 this function can also be used with some URL wrappers. Refer to Appendix L for a listing of which wrappers support stat() family of functionality.

Example 1. Display permissions as an octal value


<?php

echo substr(sprintf('%o', fileperms('/tmp')), -4);

echo substr(sprintf('%o', fileperms('/etc/passwd')), -4);

?>

This would produce the output:

1777
0644

Example 2. Display full permissions


<?php

$perms = fileperms('/etc/passwd');



if (($perms & 0xC000) == 0xC000) {

    // Socket

    $info = 's';

} elseif (($perms & 0xA000) == 0xA000) {

    // Symbolic Link

    $info = 'l';

} elseif (($perms & 0x8000) == 0x8000) {

    // Regular

    $info = '-';

} elseif (($perms & 0x6000) == 0x6000) {

    // Block special

    $info = 'b';

} elseif (($perms & 0x4000) == 0x4000) {

    // Directory

    $info = 'd';

} elseif (($perms & 0x2000) == 0x2000) {

    // Character special

    $info = 'c';

} elseif (($perms & 0x1000) == 0x1000) {

    // FIFO pipe

    $info = 'p';

} else {

    // Unknown

    $info = 'u';

}



// Owner

$info .= (($perms & 0x0100) ? 'r' : '-');

$info .= (($perms & 0x0080) ? 'w' : '-');

$info .= (($perms & 0x0040) ?

            (($perms & 0x0800) ? 's' : 'x' ) :

            (($perms & 0x0800) ? 'S' : '-'));



// Group

$info .= (($perms & 0x0020) ? 'r' : '-');

$info .= (($perms & 0x0010) ? 'w' : '-');

$info .= (($perms & 0x0008) ?

            (($perms & 0x0400) ? 's' : 'x' ) :

            (($perms & 0x0400) ? 'S' : '-'));



// World

$info .= (($perms & 0x0004) ? 'r' : '-');

$info .= (($perms & 0x0002) ? 'w' : '-');

$info .= (($perms & 0x0001) ?

            (($perms & 0x0200) ? 't' : 'x' ) :

            (($perms & 0x0200) ? 'T' : '-'));



echo $info;

?>

This would produce the output:

-r--r--r--

See also is_readable(), and stat()