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PHP : Function Reference : Filesystem Functions : is_readable

is_readable

Tells whether the filename is readable (PHP 4, PHP 5)
bool is_readable ( string filename )

Tells whether the filename is readable.

Parameters

filename

Path to the file.

Return Values

Returns TRUE if the file or directory specified by filename exists and is readable, FALSE otherwise.

Examples

Example656.is_readable() example

<?php
$filename
= 'test.txt';
if (
is_readable($filename)) {
echo
'The file is readable';
} else {
echo
'The file is not readable';
}
?>


Notes

Keep in mind that PHP may be accessing the file as the user id that the web server runs as (often 'nobody'). Safe mode limitations are not taken into account before PHP 5.1.5.

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 AppendixO, List of Supported Protocols/Wrappers for a listing of which wrappers support stat() family of functionality.

Note:

The check is done using the real UID/GID instead of the effective one.

Related Examples ( Source code ) » is_readable



Code Examples / Notes » is_readable

takeda

this function also can be used if you want check permissions for directory.

27-jul-2005 03:08

Sometimes in situations where file_exists fails (returns false even though the file does exist) stat will work.

jascha át gmx dót com

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)


php dot 5 dot ce

If you are using ACL, watch out for Bug #30931 (now open without any reaction for about 2 month, alltough an solution exists.)

jo

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

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.


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