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<div class="refnamediv">
<h1 class="refname">eio_grp</h1>
<p class="verinfo">(PECL eio >= 0.0.1dev)</p><p class="refpurpose"><span class="refname">eio_grp</span> — <span class="dc-title">Createsa request group.</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.eio-grp-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">resource</span> <span class="methodname"><strong>eio_grp</strong></span>
( <span class="methodparam"><span class="type"><a href="language.types.callable.html" class="type callable">callable</a></span> <code class="parameter">$callback</code></span>
[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$data</code><span class="initializer"> = NULL</span></span>
] )</div>
<p class="para rdfs-comment">
<span class="function"><strong>eio_grp()</strong></span> creates a request group.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.eio-grp-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<span class="term"><em><code class="parameter">callback</code></em></span>
<dd>
<p class="para">
<em><code class="parameter">callback</code></em> function is called when the request is done.
It should match the following prototype: <div class="example-contents"><div class="phpcode"><code><span style="color: #000000">
void callback(mixed $data, int $result[, resource $req]);</span>
</code></div></div>
<dl>
<dt>
<span class="term"><em><code class="parameter">data</code></em></span>
<dd>
<p class="para">is custom data passed to the request.</p></dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">result</code></em></span>
<dd>
<p class="para">request-specific result value; basically, the value returned by corresponding
system call.</p></dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">req</code></em></span>
<dd>
<p class="para">is optional request resource which can be used with functions like <span class="function"><a href="function.eio-get-last-error.html" class="function">eio_get_last_error()</a></span></p></dd>
</dt>
</dl>
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">data</code></em></span>
<dd>
<p class="para">
Arbitrary variable passed to <em><code class="parameter">callback</code></em>.
</p>
</dd>
</dt>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.eio-grp-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
<span class="function"><strong>eio_grp()</strong></span> returns request group resource on success or <strong><code>FALSE</code></strong> on error.
</p>
</div>
<div class="refsect1 examples" id="refsect1-function.eio-grp-examples">
<h3 class="title">Examples</h3>
<div class="example" id="example-3593">
<p><strong>Example #1 <span class="function"><strong>eio_grp()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br />$temp_filename </span><span style="color: #007700">= </span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #0000BB">__FILE__</span><span style="color: #007700">) .</span><span style="color: #DD0000">"/eio-file.tmp"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$fp </span><span style="color: #007700">= </span><span style="color: #0000BB">fopen</span><span style="color: #007700">(</span><span style="color: #0000BB">$temp_filename</span><span style="color: #007700">, </span><span style="color: #DD0000">"w"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">, </span><span style="color: #DD0000">"some data"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$my_file_fd </span><span style="color: #007700">= </span><span style="color: #0000BB">NULL</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* Is called when the group requests are done */<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">my_grp_done</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> </span><span style="color: #FF8000">// Remove the file, if it still exists<br /> </span><span style="color: #007700">@</span><span style="color: #0000BB">unlink</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* Is called when the temporary file is opened */<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">my_grp_file_opened_callback</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> global </span><span style="color: #0000BB">$my_file_fd</span><span style="color: #007700">, </span><span style="color: #0000BB">$grp</span><span style="color: #007700">;<br /><br /> </span><span style="color: #0000BB">$my_file_fd </span><span style="color: #007700">= </span><span style="color: #0000BB">$result</span><span style="color: #007700">;<br /><br /> </span><span style="color: #0000BB">$req </span><span style="color: #007700">= </span><span style="color: #0000BB">eio_read</span><span style="color: #007700">(</span><span style="color: #0000BB">$my_file_fd</span><span style="color: #007700">, </span><span style="color: #0000BB">4</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">,<br /> </span><span style="color: #0000BB">EIO_PRI_DEFAULT</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_grp_file_read_callback"</span><span style="color: #007700">);<br /> </span><span style="color: #0000BB">eio_grp_add</span><span style="color: #007700">(</span><span style="color: #0000BB">$grp</span><span style="color: #007700">, </span><span style="color: #0000BB">$req</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">/* Is called when the file is read */<br /></span><span style="color: #007700">function </span><span style="color: #0000BB">my_grp_file_read_callback</span><span style="color: #007700">(</span><span style="color: #0000BB">$data</span><span style="color: #007700">, </span><span style="color: #0000BB">$result</span><span style="color: #007700">) {<br /> global </span><span style="color: #0000BB">$my_file_fd</span><span style="color: #007700">, </span><span style="color: #0000BB">$grp</span><span style="color: #007700">;<br /><br /> </span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">// Create request to close the file<br /> </span><span style="color: #0000BB">$req </span><span style="color: #007700">= </span><span style="color: #0000BB">eio_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$my_file_fd</span><span style="color: #007700">);<br /><br /> </span><span style="color: #FF8000">// Add request to the group<br /> </span><span style="color: #0000BB">eio_grp_add</span><span style="color: #007700">(</span><span style="color: #0000BB">$grp</span><span style="color: #007700">, </span><span style="color: #0000BB">$req</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">// Create request group<br /></span><span style="color: #0000BB">$grp </span><span style="color: #007700">= </span><span style="color: #0000BB">eio_grp</span><span style="color: #007700">(</span><span style="color: #DD0000">"my_grp_done"</span><span style="color: #007700">, </span><span style="color: #0000BB">$temp_filename</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Create request<br /></span><span style="color: #0000BB">$req </span><span style="color: #007700">= </span><span style="color: #0000BB">eio_open</span><span style="color: #007700">(</span><span style="color: #0000BB">$temp_filename</span><span style="color: #007700">, </span><span style="color: #0000BB">EIO_O_RDWR </span><span style="color: #007700">| </span><span style="color: #0000BB">EIO_O_APPEND </span><span style="color: #007700">, </span><span style="color: #0000BB">NULL</span><span style="color: #007700">,<br /> </span><span style="color: #0000BB">EIO_PRI_DEFAULT</span><span style="color: #007700">, </span><span style="color: #DD0000">"my_grp_file_opened_callback"</span><span style="color: #007700">, </span><span style="color: #0000BB">NULL</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Add request to the group<br /></span><span style="color: #0000BB">eio_grp_add</span><span style="color: #007700">(</span><span style="color: #0000BB">$grp</span><span style="color: #007700">, </span><span style="color: #0000BB">$req</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Process requests<br /></span><span style="color: #0000BB">eio_event_loop</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output
something similar to:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
string(4) "some"
</pre></div>
</div>
</div>
</div>
<div class="refsect1 seealso" id="refsect1-function.eio-grp-seealso">
<h3 class="title">See Also</h3>
<ul class="simplelist">
<li class="member">eio_grp_cancel</li>
<li class="member">eio_grp_add</li>
</ul>
</div>
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