/
sleep.xml
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sleep.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.sleep" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>sleep</refname>
<refpurpose>Delay execution</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>sleep</methodname>
<methodparam><type>int</type><parameter>seconds</parameter></methodparam>
</methodsynopsis>
<simpara>
Delays the program execution for the given number of
<parameter>seconds</parameter>.
</simpara>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>seconds</parameter></term>
<listitem>
<para>
Halt time in seconds.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns zero on success, or &false; on error.
</para>
<para>
If the call was interrupted by a signal, <function>sleep</function> returns
a non-zero value. On Windows, this value will always be
<literal>192</literal> (the value of the
<constant>WAIT_IO_COMPLETION</constant> constant within the Windows API).
On other platforms, the return value will be the number of seconds left to
sleep.
</para>
</refsect1>
<refsect1 role="errors">
&reftitle.errors;
<para>
If the specified number of <parameter>seconds</parameter> is negative,
this function will generate a <constant>E_WARNING</constant>.
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.3.4</entry>
<entry>
Before PHP 5.3.4, on Windows, <function>sleep</function> always
returns &null; when sleep has occurred, regardless of whether the
sleep was interrupted or not.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>sleep</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// current time
echo date('h:i:s') . "\n";
// sleep for 10 seconds
sleep(10);
// wake up !
echo date('h:i:s') . "\n";
?>
]]>
</programlisting>
<para>
This example will output (after 10 seconds)
</para>
<screen>
<![CDATA[
05:31:23
05:31:33
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>usleep</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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