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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.curl-multi-exec" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>curl_multi_exec</refname>
<refpurpose>Run the sub-connections of the current cURL handle</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>curl_multi_exec</methodname>
<methodparam><type>CurlMultiHandle</type><parameter>multi_handle</parameter></methodparam>
<methodparam><type>int</type><parameter role="reference">still_running</parameter></methodparam>
</methodsynopsis>
<para>
Processes each of the handles in the stack. This method can be called whether or not a handle
needs to read or write data.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
&curl.mh.description;
<varlistentry>
<term><parameter>still_running</parameter></term>
<listitem>
<para>
A reference to a flag to tell whether the operations are still running.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
A cURL code defined in the cURL <link linkend="curl.constants">Predefined Constants</link>.
</para>
<note>
<para>
This only returns errors regarding the whole multi stack. There might still have
occurred problems on individual transfers even when this function returns
<constant>CURLM_OK</constant>.
</para>
</note>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
&curl.changelog.multi-handle-param;
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>curl_multi_exec</function> example</title>
<para>
This example will create curl handles for a list of URLs, add them to a multi
handle, and process them asynchronously.
</para>
<programlisting role="php">
<![CDATA[
<?php
$urls = [
"https://www.php.net/",
"https://www.example.com/",
];
$mh = curl_multi_init();
$map = new WeakMap();
foreach ($urls as $url) {
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_multi_add_handle($mh, $ch);
$map[$ch] = $url;
}
do {
$status = curl_multi_exec($mh, $unfinishedHandles);
if ($status !== CURLM_OK) {
throw new \Exception(curl_multi_strerror(curl_multi_errno($mh)));
}
while (($info = curl_multi_info_read($mh)) !== false) {
if ($info['msg'] === CURLMSG_DONE) {
$handle = $info['handle'];
curl_multi_remove_handle($mh, $handle);
$url = $map[$handle];
if ($info['result'] === CURLE_OK) {
$statusCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);
echo "Request to {$url} finished with HTTP status {$statusCode}:", PHP_EOL;
echo curl_multi_getcontent($handle);
echo PHP_EOL, PHP_EOL;
} else {
echo "Request to {$url} failed with error: ", PHP_EOL;
echo curl_strerror($info['result']);
echo PHP_EOL, PHP_EOL;
}
}
}
if ($unfinishedHandles) {
if (($updatedHandles = curl_multi_select($mh)) === -1) {
throw new \Exception(curl_multi_strerror(curl_multi_errno($mh)));
}
}
} while ($unfinishedHandles);
curl_multi_close($mh);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>curl_multi_init</function></member>
<member><function>curl_multi_select</function></member>
<member><function>curl_exec</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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