<?php
/**
 *  PHP 计算页面执行时间
 */
class runtime {
 
    var $StartTime = 0; 
    var $StopTime = 0; 
 
    function get_microtime() 
    { 
        list($usec, $sec) = explode(' ', microtime()); 
        return ((float)$usec + (float)$sec); 
    } 
 
    function start() 
    { 
        $this->StartTime = $this->get_microtime(); 
    } 
 
    function stop() 
    { 
        $this->StopTime = $this->get_microtime(); 
    } 
 
    function spent() 
    { 
        return round(($this->StopTime - $this->StartTime) * 1000, 2); 
    } 
 
}
?>