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Manual: is_writeable
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Sat, 12 Aug 2000
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is_writeable

(PHP3 , PHP4 )

is_writeable --  Ermittelt, ob in eine Datei geschrieben werden kann

Beschreibung

bool is_writeable (string filename)

Gibt TRUE zurück, wenn die Datei existiert und nicht schreibgeschützt ist. Das Dateinamen-Argument kann ein Verzeichnisname sein. So können Sie überprüfen, ob in ein Verzeichnis geschrieben werden kann.

Bedenken Sie, dass PHP mit der Benutzer ID auf die Datei zugreift, unter der der Webserver läuft (oftmals ist dieses 'nobody'). Beschränkungen durch safe_mode werden nicht berücksichtigt.

Das Ergebnis dieses Funktionsaufrufes wird zwischengespeichert. Siehe auch clearstatcache() für weitere Einzelheiten.

Siehe auch is_readable().


User Contributed Notes: is_writeable

brandy@klammeraffe.org
07-Jul-1999 08:48
<PRE>
&lt;?php
/*
\\
\\ -mat- filid brandy, brandy@ecrc.de, Cable&Wireless ECRC GmbH
\\ Wed Jul 7 14:47:43 CEST 1999
\\
\\ my_is_writeable.inc
\\ checks whether a file is writeable or not. PHP3 function is_writeable() is broken.
\\
*/

Function my_is_writeable( $filename ) {

clearstatcache();

$perms = @Fileperms( $filename );
$owner = @FileOwner( $filename );
eregi( "^uid=([0-9]*)", exec( "id"), $regs );
$apacheuid = $regs[1];

/* Hint: integers starting with '0' are octal */
$perms = 0777 & $perms;

if ( $apacheuid != $owner ) {
if ( 06 == ( 07 & $perms ) ) { return 1; } else { return 0; }
} else {
if ( 0600 == ( 0700 & $perms ) ) { return 1; } else { return 0; }
}
}
?>
</PRE>

hellekin@imaginet.fr
27-Oct-1999 09:07
It seems that is_writeable() became <b>is_writable()</b> in 4.0b2.

zeekamotay@hotmail.com
13-Feb-2000 11:38
My my_is_writeable() is shorter than yours is! :)

Using include_path:

function my_is_writeable ($file) {
return(@fclose(@fopen($file,"a",1)));
}

Not using include_path:

function my_is_writeable ($file) {
return(@fclose(@fopen($file,"a")));
}



laroche@nobug.lu
21-Mar-2000 05:39
Why can't I verify if a file like www.nobug.lu/index.php3 is readable, or writeable ? Because I wanna check is a file exists or not an with file_exists it don't work too, ... Well would be fine when someone could explain me this problem.

hellekin@imaginet.fr
21-Jul-2000 01:43
is_writeable() works in PHP 4.0.1pl2 (didn't check for earlier versions).

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