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is_uploaded_file> <is_link
Last updated: Fri, 04 Jul 2008

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is_readable

(PHP 4, PHP 5)

is_readable — Prüft, ob eine Datei lesbar ist

Beschreibung

bool is_readable ( string $filename )

Gibt TRUE zurück wenn die Datei existiert und lesbar ist.

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

Hinweis: Die Ergebnisse dieser Funktion werden gecached. Weitere Details erhalten Sie bei clearstatcache().

Hinweis: Diese Funktion kann nicht mit entfernten Dateien arbeiten, da der Zugriff auf die Datei, die bearbeitet werden soll, über das Dateisystem des Servers möglich sein muss.

Siehe auch is_writable(), file_exists() und fgets().



is_uploaded_file> <is_link
Last updated: Fri, 04 Jul 2008
 
add a note add a note User Contributed Notes
is_readable
jascha át gmx dót com
07-Nov-2006 03:58
Safe_mode restrictions ignored means:
cant read by read() so is_readable() = false.
even if safe_mode_include_dir is set and include does works, is_readable() is false to. :(
(php5)
jo at durchholz dot org
30-Jan-2006 06:15
DrTebi at yahoo dot com is wrong. is_readable() checks whether you can do file_get_contents() or similar calls, no more, no less. If the location given returns a 500 or 403 error, you can still read() that (you'll simply get the error page), but it's still read()able. Using is_readable to check the validity of a URL is simply the wrong function.
DrTebi at yahoo dot com
13-Oct-2005 06:22
Be careful when using is_readable on symbolic links.

is_readable will return true if the file the symbolic link is pointing to is readable.

The problem is that if the server does NOT allow to follow symbolic links, is_readable will still return true, but e.g. redirecting to the sybolic link will not work. For Apache, make sure that at the server, virtual host configuration level, or inside a directory container you have set
Options +FollowSymLinks

As an example, let's say you have at the document root directory:
index.php -- the script using is_readable
my_linked_page.html -- a regular HTML page
my_link -- a link pointing to my_linked_page.html

Now in index.php:
<?php
if (is_readable('my_link')) {
 
header('Location: /my_link');
}
?>

If FollowSymLinks is forbidden, this will not work, if allowed, it will.
27-Jul-2005 04:08
Sometimes in situations where file_exists fails (returns false even though the file does exist) stat will work.
php dot 5 dot ce at spamgourmet dot com
12-Jan-2005 03:32
If you are using ACL, watch out for Bug #30931 (now open without any reaction for about 2 month, alltough an solution exists.)

is_uploaded_file> <is_link
Last updated: Fri, 04 Jul 2008
 
 
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