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.
is_readable
(PHP 4, PHP 5, PHP 7)
is_readable — Tells whether a file exists and is readable
Descrierea
is_readable
( string
$filename
) : boolTells whether a file exists and is readable.
Parametri
-
filename -
Path to the file.
Valorile întoarse
Returns true if the file or directory specified by
filename exists and is readable, false otherwise.
Exemple
Example #1 is_readable() example
<?php
$filename = 'test.txt';
if (is_readable($filename)) {
echo 'The file is readable';
} else {
echo 'The file is not readable';
}
?>
Erori/Excepții
În cazul eșecului este emis un E_WARNING.
Note
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.
Notă: Rezultatele acestei funcții sunt stocate în cache. Accesați clearstatcache() pentru mai multe detalii.
Sfat
Începând cu PHP 5.0.0 această funcție poate fi utilizată de asemenea cu unele învelișuri URL. Referiți-vă la Supported Protocols and Wrappers pentru a determina care învelișuri susțin familia de funcționalitate stat().
Notă:
The check is done using the real UID/GID instead of the effective one.
This function may return true for directories. Use
is_dir() to distinguish file and directory.
A se vedea și
- is_writable() - Tells whether the filename is writable
- file_exists() - Checks whether a file or directory exists
- fgets() - Gets line from file pointer
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User Contributed Notes 4 notes
jo at durchholz dot org ¶
18 years ago
arikan134 at gmail dot com ¶
8 years ago
is readable recursively. Check all sub directories and files readable
<?php
function is_readable_r($dir) {
if (is_dir($dir)) {
if(is_readable($dir)){
$objects = scandir($dir);
foreach ($objects as $object) {
if ($object != "." && $object != "..") {
if (!is_readable_r($dir."/".$object)) return false;
else continue;
}
}
return true;
}else{
return false;
}
}else if(file_exists($dir)){
return (is_readable($dir));
}
}
?>
pgl at yoyo dot org ¶
15 years ago
Note that is_readable() will return false for streams, eg, php://stdin.
