(PHP 5 >= 5.1.0, PHP 7, PHP 8)
posix_access — Determine accessibility of a file
posix_access() checks the user's permission of a file.
filename
The name of the file to be tested.
flags
A mask consisting of one or more of POSIX_F_OK
,
POSIX_R_OK
, POSIX_W_OK
and
POSIX_X_OK
.
POSIX_R_OK
, POSIX_W_OK
and
POSIX_X_OK
request checking whether the file
exists and has read, write and execute permissions, respectively.
POSIX_F_OK
just requests checking for the
existence of the file.
Example #1 posix_access() example
This example will check if the $file is readable and writable, otherwise will print an error message.
<?php$file = 'some_file';if (posix_access($file, POSIX_R_OK | POSIX_W_OK)) { echo 'The file is readable and writable!';} else { $error = posix_get_last_error(); echo "Error $error: " . posix_strerror($error);}?>