用php写入一个1GB大小的文件，检查硬盘的写速率，可能有一定误差，一般电脑读写在20M/s，这个测试要执行大概40-50s。
例子，硬盘速度测试代码：
复制代码 代码示例:
<?php
//测试硬盘写入速度
//by www.jb200.com
set_time_limit(0);
$str = str_pad($str, 512, "0");
$file = fopen("./temp","a+");
$i = 0;
$bytes = 1000000000;
$mygabyte = $bytes/1000000;
echo "test start. waiting ...";
$starttime = time();
while($i < $bytes){
$i += fwrite($file, $str);
}
$endtime = time();
$usetime = $endtime - $starttime;
$write_xiaolv = $bytes/$usetime;
$myga_xiaolv = $mygabyte/$usetime;
echo "create 1GB file use time ".$usetime." secondsn";
echo "speed :".$write_xiaolv." byte/sn";
echo "speed :".$myga_xiaolv." m/sn";
