Examples
Example #1 Cancelling a request
<?php
/* Is called when eio_nop() finished */
function my_nop_cb($data, $result) {
echo "my_nop ", $data, "\n";
}
// This eio_nop() call will be cancelled
$req = eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "1");
var_dump($req);
eio_cancel($req);
// This time eio_nop() will be processed
eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "2");
// Process requests
eio_event_loop();
?>
The above example will output something similar to:
resource(4) of type (EIO Request Descriptor) my_nop 2
Example #2 Calling eio_chmod()
<?php
$temp_filename = dirname(__FILE__) ."/eio-temp-file.tmp";
touch($temp_filename);
/* Is called when eio_chmod() finished */
function my_chmod_callback($data, $result) {
global $temp_filename;
if ($result == 0 && !is_readable($temp_filename) && is_writable($temp_filename)) {
echo "eio_chmod_ok";
}
@unlink($temp_filename);
}
eio_chmod($temp_filename, 0200, EIO_PRI_DEFAULT, "my_chmod_callback");
eio_event_loop();
?>
The above example will output something similar to:
eio_chmod_ok
Example #3 Making a custom request
<?php
/* Callback for the custom callback */
function my_custom_callback($data, $result) {
var_dump($data);
var_dump(count($result));
var_dump($result['data_modified']);
var_dump($result['result']);
}
/* The custom request */
function my_custom($data) {
var_dump($data);
$result = array(
'result' => 1001,
'data_modified' => "my custom data",
);
return $result;
}
$data = "my_custom_data";
$req = eio_custom("my_custom", EIO_PRI_DEFAULT, "my_custom_callback", $data);
var_dump($req);
eio_event_loop();
?>
The above example will output something similar to:
resource(4) of type (EIO Request Descriptor) string(14) "my_custom_data" string(14) "my_custom_data" int(2) string(14) "my custom data" int(1001)
Example #4 Grouping requests
<?php
/*
* Create a group request to open, read and close a file
*/
$temp_filename = dirname(__FILE__) ."/eio-file.tmp";
$fp = fopen($temp_filename, "w");
fwrite($fp, "some data");
fclose($fp);
/* Is called when the group requests are done */
function my_grp_done($data, $result) {
global $temp_filename;
var_dump($result == 0);
@unlink($temp_filename);
}
/* Is called when eio_open() done */
function my_grp_file_opened_callback($data, $result) {
global $my_file_fd, $grp;
$my_file_fd = $result;
var_dump($result > 0);
// Create eio_read() request and add it to the group
$req = eio_read($my_file_fd, 4, 0, EIO_PRI_DEFAULT, "my_grp_file_read_callback");
eio_grp_add($grp, $req);
}
/* Is called when eio_read() done */
function my_grp_file_read_callback($data, $result) {
global $my_file_fd, $grp;
var_dump($result);
// Create eio_close() request and add it to the group
$req = eio_close($my_file_fd);
eio_grp_add($grp, $req);
}
$grp = eio_grp("my_grp_done", "my_grp_data");
// Create eio_open() request and add it to the group
$req = eio_open($temp_filename, EIO_O_RDWR | EIO_O_APPEND , NULL,
EIO_PRI_DEFAULT, "my_grp_file_opened_callback", NULL);
eio_grp_add($grp, $req);
var_dump($grp);
eio_event_loop();
?>
The above example will output something similar to:
resource(6) of type (EIO Group Descriptor) bool(true) string(4) "some" bool(true)
Example #5 Using eio with libevent extension
<?php
function my_eio_poll($fd, $events, $arg) {
/* Some libevent regulation might go here .. */
if (eio_nreqs()) {
eio_poll();
}
/* .. and here */
}
function my_nop_cb($d, $r) {
var_dump($r); var_dump($d);
}
$base = event_base_new();
$event = event_new();
$fd = eio_get_event_stream();
var_dump($fd);
eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "nop data");
eio_mkdir("/tmp/abc-eio-temp", 0750, EIO_PRI_DEFAULT, "my_nop_cb", "nop 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, $base);
// enable event
event_add($event);
// start event loop
event_base_loop($base);
/* The same will be available via buffered libevent interface */
?>
The above example will output something similar to:
int(3) int(0) string(8) "nop data" int(0) string(10) "mkdir data"
Example #6 Using eio with event extension
<?php
$base = new EventBase();
// Retrieve eio polling stream.
// Note, this variable should be alive as long as the event loop is running.
$eio_stream = eio_get_event_stream();
// Bind eio polling stream to the event loop.
$poll_event = new Event($base, $eio_stream, Event::READ, function () {
if (eio_nreqs()) {
eio_poll();
}
});
$poll_event->add();
// Add eio jobs
eio_nop(EIO_PRI_DEFAULT, function () {
echo "eio_nop\n";
});
// Add events
$timer = Event::timer($base, function () {
echo "2 seconds elapsed\n";
});
$timer->add(2);
// Dispatch events.
$base->dispatch();
?>
The above example will output something similar to:
eio_nop 2 seconds elapsed
English translation
You have asked to visit this site in English. For now, only the interface is translated, but not all the content yet.If you want to help me in translations, your contribution is welcome. All you need to do is register on the site, and send me a message asking me to add you to the group of translators, which will give you the opportunity to translate the pages you want. A link at the bottom of each translated page indicates that you are the translator, and has a link to your profile.
Thank you in advance.
Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-eio.examples.html
The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.
References
These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.
