Determine accessibility of a file
  • « POSIX Functions
    		•   
  • posix_ctermid »
    		•

    posix_access

    (PHP 5 >= 5.1.0, PHP 7, PHP 8)

    posix_access — Determine accessibility of a file

    Description

    posix_access(string $filename, int $flags = 0): bool

    posix_access() checks the user's permission of a file.

    Parameters

    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.

    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