php-doc-en/reference/curl/functions/curl-multi-select.xml

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<refentry xml:id="function.curl-multi-select" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>curl_multi_select</refname>
  <refpurpose>Wait for activity on any curl_multi connection</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>int</type><methodname>curl_multi_select</methodname>
   <methodparam><type>resource</type><parameter>mh</parameter></methodparam>
   <methodparam choice="opt"><type>float</type><parameter>timeout</parameter><initializer>1.0</initializer></methodparam>
  </methodsynopsis>
  <para>
    Blocks until there is activity on any of the curl_multi connections.
  </para>

 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    &curl.mh.description;
    <varlistentry>
     <term><parameter>timeout</parameter></term>
     <listitem>
      <para>
       Time, in seconds, to wait for a response.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   On success, returns the number of descriptors contained in 
   the descriptor sets.  On failure, this function will return -1 on a select failure or timeout (from the underlying select system call).
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>curl_multi_init</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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