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This extension provides asyncronous POSIX I/O by means of » libeio C library written by Marc Lehmann.

Замечание: Для Windows-платформ это расширение недоступно.


It is important to aware that each request is executed in a thread, and the order of execution of continuously queued requests basically is unpredictable. For instance, the following piece of code is incorrect.

Пример #1 Incorrect requests
// Request to create symlink of $filename to $link
eio_symlink($filename, $link);
// Request to move $filename to $new_filename
eio_rename($filename, $new_filename);
// Process requests

In the example above eio_rename() request may finish before eio_symlink(). To fix it you might call eio_rename() in the callback of eio_symlink():
Пример #2 Calling request from a request callback
function my_symlink_done($filename, $result) {
 // Request to move $filename to $new_filename
 eio_rename($filename, "/path/to/new-name");
 // Process requests
// Request to create symlink of $filename to $link
eio_symlink($filename, $link, EIO_PRI_DEFAULT, "my_symlink_done", $filename);
// Process requests

Alternatively, you might want to create a request group:
Пример #3 Calling request from a request callback
/* Is called when the group requests are done */
function my_grp_done($data, $result) {
 // ...
function my_symlink_done($filename, $result) {
 // Create eio_rename request and add it to the group
 $req = eio_rename($filename, "/path/to/new-name");
 eio_grp_add($grp, $req);
 // You might want to add more requests...
// Create a request group
$grp = eio_grp("my_grp_done", "my_grp_data");
// Create eio_symlink request and add it to the group
// Pass $filename to the callback
$req = eio_symlink($filename, $link,
  EIO_PRI_DEFAULT, "my_symlink_done", $filename);
eio_grp_add($grp, $req);
// Process requests

Group is a special kind of request that could accumulate a set of regular eio requests. This could be used to create a complex request that opens, reads and closes a file.

Since version 0.3.0 alpha, a variable used in communications with libeio internally, could be retrieved with eio_get_event_stream(). The variable could be used to bind to an event loop supported by some other extension. You might organize a simple event loop where eio and libevent work together:

Пример #4 Using eio with libevent
function my_eio_poll($fd, $events, $arg) {
    /* Some libevent regulation might go here .. */
    if (eio_nreqs()) {
    /* .. and here */
function my_res_cb($d, $r) {
    var_dump($r); var_dump($d);
$base = event_base_new();
$event = event_new();
// This stream is used to bind with libevent
$fd = eio_get_event_stream();
eio_nop(EIO_PRI_DEFAULT, "my_res_cb", "nop data");
eio_mkdir("/tmp/abc-eio-temp", 0750, EIO_PRI_DEFAULT, "my_res_cb", "mkdir data");
/* some other eio_* calls here ... */
// set event flags
event_set($event, $fd, EV_READ /*| EV_PERSIST*/, "my_eio_poll", array($event, $base));
// set event base 
event_base_set($event, $base);
// enable event
// start event loop
/* The same will be available via buffered libevent interface */

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Описание на ru2.php.net
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