mirror of
https://github.com/sigmasternchen/php-doc-en
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fed18ab532
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@167288 c90b9560-bf6c-de11-be94-00142212c4b1
111 lines
2.8 KiB
XML
111 lines
2.8 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.12 $ -->
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<!-- splitted from ./en/functions/datetime.xml, last change in rev 1.2 -->
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<refentry id="function.microtime">
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<refnamediv>
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<refname>microtime</refname>
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<refpurpose>
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Return current Unix timestamp with microseconds
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</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<methodsynopsis>
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<type>mixed</type><methodname>microtime</methodname>
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<methodparam choice="opt"><type>bool</type><parameter>get_as_float</parameter></methodparam>
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</methodsynopsis>
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<para>
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<function>microtime</function> returns the current Unix timestamp with
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microseconds. This function is only available on operating systems that
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support the gettimeofday() system call.
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</para>
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<para>
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When called without the optional argument, this function returns the string
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"msec sec" where sec is the current time measured in the number of
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seconds since the Unix Epoch (0:00:00 January 1, 1970 GMT), and
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msec is the microseconds part.
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Both portions of the string are returned in units of seconds.
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</para>
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<para>
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When <parameter>get_as_float</parameter> is given, and evaluates to
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&true;, <function>microtime</function> will return a float.
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</para>
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<note>
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<simpara>
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The <parameter>get_as_float</parameter> parameter was added as of
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PHP 5.0.0.
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</simpara>
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</note>
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<para>
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<example>
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<title>Timing script execution with <function>microtime</function></title>
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<programlisting role="php">
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<![CDATA[
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<?php
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/**
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* Simple function to replicate PHP 5 behaviour
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*/
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function microtime_float()
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{
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list($usec, $sec) = explode(" ", microtime());
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return ((float)$usec + (float)$sec);
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}
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$time_start = microtime_float();
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// Sleep for a while
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usleep(100);
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$time_end = microtime_float();
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$time = $time_end - $time_start;
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echo "Did nothing in $time seconds\n";
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?>
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]]>
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</programlisting>
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</example>
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<example>
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<title>Timing script execution in PHP 5</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$time_start = microtime(true);
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// Sleep for a while
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usleep(100);
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$time_end = microtime(true);
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$time = $time_end - $time_start;
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echo "Did nothing in $time seconds\n";
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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See also <function>time</function>.
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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