(PECL eio >= 0.0.1dev)
eio_mkdir — Create directory
$path
   , int $mode
   [, int $pri = EIO_PRI_DEFAULT
   [, callable $callback = NULL
   [, mixed $data = NULL
  ]]] )
  eio_mkdir() creates directory with specified access
  mode.
  
pathPath for the new directory.
modeAccess mode, e.g. 0755
priThe request priority: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or NULL.
If NULL passed, pri internally is set to
EIO_PRI_DEFAULT.
callback
callback function is called when the request is done.
It should match the following prototype: 
void callback(mixed $data, int $result[, resource $req]);
datais custom data passed to the request.
resultrequest-specific result value; basically, the value returned by corresponding system call.
reqis optional request resource which can be used with functions like eio_get_last_error()
data
     Arbitrary variable passed to callback.
     
   eio_mkdir() returns request resource on success or FALSE on error.
  
Example #1 eio_mkdir() example
<?php
$temp_dirname = "eio-temp-dir";
/* Is called when eio_mkdir() finishes */
function my_mkdir_callback($data, $result) {
 if ($result == 0 && is_dir($temp_dirname)
   && !is_readable($temp_dirname)
   && is_writable($temp_dirname)) {
  echo "eio_mkdir_ok";
 }
 // Remove directory
    if (file_exists($data))
        rmdir($temp_dirname);
}
// Create directory with access mode 0300
eio_mkdir($temp_dirname, 0300, EIO_PRI_DEFAULT, "my_mkdir_callback", $temp_dirname);
eio_event_loop();
?>
The above example will output something similar to:
eio_mkdir_ok