Php/docs/function.posix-access
posix_access
(PHP 5 >= 5.1.0, PHP 7)
posix_access — Determine accessibility of a file
Description
posix_access
( string $file
[, int $mode = POSIX_F_OK
] ) : bool
posix_access() checks the user's permission of a file.
Parameters
fileThe name of the file to be tested.
modeA mask consisting of one or more of
POSIX_F_OK,POSIX_R_OK,POSIX_W_OKandPOSIX_X_OK.POSIX_R_OK,POSIX_W_OKandPOSIX_X_OKrequest checking whether the file exists and has read, write and execute permissions, respectively.POSIX_F_OKjust requests checking for the existence of the file.
Return Values
Returns TRUE on success or FALSE on failure.
Examples
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);}?>
Notes
See Also
- posix_get_last_error() - Retrieve the error number set by the last posix function that failed
- posix_strerror() - Retrieve the system error message associated with the given errno
