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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.13 $ -->
<!-- splitted from ./en/functions/datetime.xml, last change in rev 1.2 -->
<refentry id="function.microtime">
<refnamediv>
<refname>microtime</refname>
<refpurpose>Return current Unix timestamp with microseconds</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>mixed</type><methodname>microtime</methodname>
<methodparam choice="opt"><type>bool</type><parameter>get_as_float</parameter></methodparam>
</methodsynopsis>
<para>
<function>microtime</function> returns the current Unix timestamp with
microseconds. This function is only available on operating systems that
support the gettimeofday() system call.
</para>
<para>
When called without the optional argument, this function returns the string
"msec sec" where sec is the current time measured in the number of
seconds since the Unix Epoch (0:00:00 January 1, 1970 GMT), and
msec is the microseconds part.
Both portions of the string are returned in units of seconds.
</para>
<para>
When <parameter>get_as_float</parameter> is given, and evaluates to
&true;, <function>microtime</function> will return a float.
</para>
<note>
<simpara>
The <parameter>get_as_float</parameter> parameter was added as of
PHP 5.0.0.
</simpara>
</note>
<para>
<example>
<title>Timing script execution with <function>microtime</function></title>
<programlisting role="php">
<![CDATA[
<?php
/**
* Simple function to replicate PHP 5 behaviour
*/
function microtime_float()
{
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
$time_start = microtime_float();
// Sleep for a while
usleep(100);
$time_end = microtime_float();
$time = $time_end - $time_start;
echo "Did nothing in $time seconds\n";
?>
]]>
</programlisting>
</example>
<example>
<title>Timing script execution in PHP 5</title>
<programlisting role="php">
<![CDATA[
<?php
$time_start = microtime(true);
// Sleep for a while
usleep(100);
$time_end = microtime(true);
$time = $time_end - $time_start;
echo "Did nothing in $time seconds\n";
?>
]]>
</programlisting>
</example>
</para>
<para>
See also <function>time</function>.
</para>
</refsect1>
</refentry>
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