Libevent bindings for PHP

Libevent is a library that provides a mechanism to execute a callback function when a specific event occurs on a file descriptor or after a timeout has been reached.

More information about Libevent can be found at » http://libevent.org/.

-- NOTE : This fork is the port of the module to PHP7 / PHPNG

Requirements

This extension requires » libevent library. Minimal required version is 1.4.0.

Installation

Information for installing this PECL extension may be found in the manual chapter titled Installation of PECL extensions. Additional information such as new releases, downloads, source files, maintainer information, and a CHANGELOG, can be located here: » http://pecl.php.net/package/libevent.

Compile from sources

Pre-requisites (only for linux) :

sudo apt-get install php7.0-dev gcc make libevent-dev

Compile sources :

git clone https://github.com/expressif/pecl-event-libevent.git
cd pecl-event-libevent
phpize
./configure
make && sudo make install

Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

• EV_TIMEOUT (integer)
• EV_READ (integer)
• EV_WRITE (integer)
• EV_SIGNAL (integer)
• EV_PERSIST (integer)
• EVLOOP_NONBLOCK (integer)
• EVLOOP_ONCE (integer)

Examples

Example #1 polling STDIN using basic API

<?php

function print_line($fd, $events, $arg)
{
    static $max_requests = 0;

    $max_requests++;

    if ($max_requests == 10) {
        // exit loop after 10 writes
        event_base_loopexit($arg[1]);
    }

    // print the line
    echo  fgets($fd);
}

// create base and event
$base = event_base_new();
$event = event_new();

$fd = STDIN;

// set event flags
event_set($event, $fd, EV_READ | EV_PERSIST, "print_line", array($event, $base));
// set event base
event_base_set($event, $base);

// enable event
event_add($event);
// start event loop
event_base_loop($base);

Example #2 polling STDIN using buffered event API

<?php

function print_line($buf, $arg)
{
    static $max_requests;

    $max_requests++;

    if ($max_requests == 10) {
        event_base_loopexit($arg);
    }

    // print the line
    echo event_buffer_read($buf, 4096);
}

function error_func($buf, $what, $arg)
{
    // handle errors
}

$base = event_base_new();
$eb = event_buffer_new(STDIN, "print_line", NULL, "error_func", $base);

event_buffer_base_set($eb, $base);
event_buffer_enable($eb, EV_READ);

event_base_loop($base);

Credits

Antony Dovgal, Arnaud Le Blanc, Ioan Chiriac, JoungKyun KIm