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/*
* php 页面执行时间统计类
*
*/
class runtime
{
var $StartTime = 0;
var $StopTime = 0;
//获取微秒
function get_microtime()
{
list($usec, $sec) = explode(' ', microtime());
return ((float)$usec + (float)$sec);
}
//记录开始时间
function start()
{
$this->StartTime = $this->get_microtime();
}
//记录结束时间
function stop()
{
$this->StopTime = $this->get_microtime();
}
//计算所用时间&取整
function spent()
{
return round(($this->StopTime - $this->StartTime) * 1000, 1);
}
}
$runtime = new runtime();
//循环次数
$count = 10000;
$str = " string";
$str_single = 'This is a';
$str_double = "This is a";
$str_single_var = 'This is a'.$str;
$str_double_var = "This is a$str";
echo ' ';
//打印$count 次 单引号
$runtime->start();
for($i=0;$i<$count;$i++){
echo $str_single;
}
$runtime->stop();
$sp_single = $runtime->spent();
//打印$count 次 双引号
$runtime->start();
for($i=0;$i<$count;$i++){
echo $str_double;
}
$runtime->stop();
$sp_double = $runtime->spent();
//打印$count 次 单引号(混合)
$runtime->start();
for($i=0;$i<$count;$i++){
echo $str_single_var;
}
$runtime->stop();
$sp_single_var = $runtime->spent();
//打印$count 次 双引号(混合)
$runtime->start();
for($i=0;$i<$count;$i++){
echo $str_double_var;
}
$runtime->stop();
$sp_double_var = $runtime->spent();
echo '
echo '循环输出'.$count.'次，单引号用时：'.$sp_single.' 双引号用时： '.$sp_double.' 单引号(混合)用时：'.$sp_single_var.' 双引号(混合)用时：'.$sp_double_var;
?>
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