fileperms

(PHP 4, PHP 5, PHP 7, PHP 8)

fileperms — Restituisce i permessi sui file

Descrizione

fileperms(string $filename): int

Restituisce i permessi sui file, or false in caso di errore.

Nota: I risultati di questa funzione saranno memorizzati. Vedere clearstatcache() per maggiori dettagli.

Suggerimento

A partire da PHP 5.0.0, questa funzione può essere utilizzata con alcuni URL wrappers. Fare riferimento a Supported Protocols and Wrappers per la lista di quali wrappers supportano le funzioni della famiglia stat().

Example #1 Mostra i permessi in valore ottale

<?php
echo substr(sprintf('%o', fileperms('/tmp')), -4);
echo substr(sprintf('%o', fileperms('/etc/passwd')), -4);
?>

Ciò produrrà il seguente output:

1777
0644

Example #2 Mostra gli interi permessi

<?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;
?>

Ciò produrrà il seguente output:

-r--r--r--

Vedi anche is_readable(), e stat()

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User Contributed Notes 4 notes

down

coolmic at example dot com ¶

11 years ago

Don't use substr, use bit operator
<?php
decoct(fileperms($file) & 0777); // return "755" for example
?>

If you want to compare permission
<?php
0755 === (fileperms($file) & 0777);
?>

down

admin at torntech dot com ¶

12 years ago

This may not be immediately apparent to some, but you can use octdec( $octal_value ) to match the permissions retrieved by file perms

<?php

//assumes file has 2770 permissions
$perm= fileperms( __FILE__ ); 
$bit = "102770";

printf( "%s\n", octdec( $bit ) );
printf( "%s\n", $perm);

?>

down

paul2712 at gmail dot com ¶

17 years ago

Do not forget: clearstatcache();
==============================
 
When ever you make a:

mkdir($dstdir, 0770 ))

or a:

chmod($dstdir, 0774 ); 

You have to call:

clearstatcache();

before you can call:

fileperms($dstdir);

down

chris at ocproducts dot com ¶

4 years ago

Windows has a very different file permission model to Unix and integrates them only minimally.

Here's how Windows calculates the bitmask...

u+w/g+w/o+w is set based on whether the file has the read only flag.

u+r/g+w/o+w is always set.

u+x/g+x/o+x is set based on whether $filename is an inherently executable file (e.g. bat) or a directory.

Windows isn't integrating its ACLs at all.

Here's the source of all this: https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/stat-functions?view=vs-2019 (but it doesn't provide many details)

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