Typecho1.2 可用的页面加载时间代码

Typecho更新到1.2版本后，网上好多代码都不能用了，这个是1.2可用的页面加载时间代码。

/**
* 加载时间
* @return bool
*/
function timer_start() {
global $timestart;
$mtime = explode( ' ', microtime() );
$timestart = $mtime[1] + $mtime[0];
return true;
}
timer_start();
function timer_stop( $display = 0, $precision = 3 ) {
global $timestart, $timeend;
$mtime = explode( ' ', microtime() );
$timeend = $mtime[1] + $mtime[0];
$timetotal = number_format( $timeend - $timestart, $precision );
$r = $timetotal < 1 ? $timetotal * 1000 . " ms" : $timetotal . " s";
if ( $display ) {
echo $r;
}
return $r;
}

加载耗时：<?php echo timer_stop();?>