<HTML ><HEAD ><TITLE >microtime</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="PHP Manual" HREF="index.html"><LINK REL="UP" TITLE="Date and Time functions" HREF="ref.datetime.html"><LINK REL="PREVIOUS" TITLE="localtime" HREF="function.localtime.html"><LINK REL="NEXT" TITLE="mktime" HREF="function.mktime.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.localtime.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.mktime.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.microtime" ></A >microtime</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN16922" ></A ><P > (PHP 3, PHP 4 )</P >microtime -- Return current UNIX timestamp with microseconds</DIV ><DIV CLASS="refsect1" ><A NAME="AEN16925" ></A ><H2 >Description</H2 >string <B CLASS="methodname" >microtime</B > ( void)<BR ></BR ><P > 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. This function is only available on operating systems that support the gettimeofday() system call. </P ><P > Both portions of the string are returned in units of seconds. <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN16933" ></A ><P ><B >Example 1. <B CLASS="function" >microtime()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><PRE CLASS="php" >function getmicrotime(){ list($usec, $sec) = explode(" ",microtime()); return ((float)$usec + (float)$sec); } $time_start = getmicrotime(); for ($i=0; $i < 1000; $i++){ //do nothing, 1000 times } $time_end = getmicrotime(); $time = $time_end - $time_start; echo "Did nothing in $time seconds";</PRE ></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ><P > See also <A HREF="function.time.html" ><B CLASS="function" >time()</B ></A >. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.localtime.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.mktime.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >localtime</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.datetime.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >mktime</TD ></TR ></TABLE ></DIV ></BODY ></HTML >