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Manual: is_readable
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Previous page
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  Updated
Sat, 12 Aug 2000
 is_writeable 
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is_readable

(PHP3 , PHP4 )

is_readable --  Ermittelt ob eine Datei lesbar ist

Beschreibung

bool is_readable (string filename)

Gibt TRUE zurück wenn die Datei existiert und sie lesbar ist.

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_writeable().


User Contributed Notes: is_readable

cdi@thewebmasters.net
07-Jan-1999 02:27
Quirk: is-readable returns true if the file has the user-read bit set, regardless if the process can actually read the file or not.

Example:
File (user/group 500/500)
PHP Process running as (99/99)

-rw-r--r-- is_readable returns true
-rw------- is_readable returns true(!?)
--w-r--r-- is_readable returns false(!?)

Same problem with is_writable. These two functions return completely useless information. <B>is_readable</B> cannot be trusted to return correct information! Use <B>stat</B> or <B>fileperms</B> and do the work youself.

CDI



hartmut@six.de
07-Mar-2000 08:27
help is on the way, see bug id #3753

 About Notes

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