php-doc-en/reference/libevent/examples.xml

<?xml version="1.0" encoding="iso-8859-1"?>
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<chapter xml:id="libevent.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.examples;
 <para>
  <example>
   <title>polling <constant>STDIN</constant> using basic API</title>
   <programlisting role="php">
<![CDATA[
<?php

function callback_func($fd, $events, $arg)
{
    static $max_requests;

    $max_requests++;

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

    /* read while we can */
    while (false !=== ($data = fread($fd, 4096))) {
        echo $data;
    }
}

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

$fd = STDIN;

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

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

?>
]]>
   </programlisting>
  </example>
 </para>
 <para>
  <example>
   <title>polling <constant>STDIN</constant> using buffered event API</title>
   <programlisting role="php">
<![CDATA[
<?php

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

    $max_requests++;

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

    /* read while we can */
    while (false !=== ($data = event_buffer_read($buf, 10))) {
        echo $data;
    }
}

function error_func($buf, $what, $arg)
{
    /* handle an error */
}

$base = event_base_new();
$b = event_buffer_new(STDIN, "callback_func", NULL, "error_func", $base);

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

event_base_loop($base);

?>
]]>
   </programlisting>
  </example>
 </para>
</chapter>

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