php+mysql prepare 与普通查询的性能对比

实例代码如下：

<?php
class timer {
public $StartTime = 0;
public $StopTime = 0;
public $TimeSpent = 0;

function start(){
$this->StartTime = microtime();
}

function stop(){
$this->StopTime = microtime();
}

function spent() {
if ($this->TimeSpent) {
return $this->TimeSpent;

} else {
// http://www.manongjc.com
$StartMicro = substr($this->StartTime,0,10);
$StartSecond = substr($this->StartTime,11,10);
$St..