PHP 计算程序运行的时间

<?php
class SpendTime {
static function Start($sTransName) {
SpendTime::$arrStartTimes [$sTransName] = microtime ( true );
}

static function End($sTransName) {
SpendTime::$arrSpendTimes [$sTransName] = microtime ( true ) – SpendTime::$arrStartTimes [$sTransName];
}

static function PrintTime() {
echo “<pre>”;
print_r ( SpendTime::$arrSpendTimes );
echo “</pre>”;
}

static $arrStartTimes = array ();
static $arrEndTimes = array ();
static $arrSpendTimes = array ();
}
?>