php-doc-en/reference/misc/functions/usleep.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.usleep" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>usleep</refname>
  <refpurpose>Delay execution in microseconds</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>void</type><methodname>usleep</methodname>
   <methodparam><type>int</type><parameter>microseconds</parameter></methodparam>
  </methodsynopsis>
  <para>
   Delays program execution for the given number of microseconds.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>microseconds</parameter></term>
     <listitem>
      <para>
       Halt time in microseconds. A microsecond is one millionth of a
       second.
      </para>
      <note>
       <simpara>
        Values larger than <literal>1000000</literal> (i.e. sleeping for more than a second)
        may not be supported by the operating system. Use <function>sleep</function> instead.
       </simpara>
      </note>
      <note>
       <simpara>
        On Windows, the system may sleep longer that the given number of microseconds,
        depending on the hardware.
       </simpara>
      </note>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   &return.void;
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>usleep</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php

// Current time
echo date('h:i:s') . "\n";

// wait for 2 seconds
usleep(2000000);

// back!
echo date('h:i:s') . "\n";

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
11:13:28
11:13:30
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>sleep</function></member>
    <member><function>time_nanosleep</function></member>
    <member><function>time_sleep_until</function></member>
    <member><function>set_time_limit</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>
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