PHP中include与include_once加载文件性能测试
1.用include_once加载文件
function test_include(){
$time_start=microtime_float();
for($i=0;$i<100;$i++){
include_once('py_dic.php');
}
$time_end=microtime_float();
printf("total time:%s%s",$time_end-$time_start,l);
}
test_include();
循环100次，用include_once
total time:0.037981986999512
2.用include加载文件
function test_include(){
$time_start=microtime_float();
for($i=0;$i<100;$i++){
include('py_dic.php');
}
$time_end=microtime_float();
printf("total time:%s%s",$time_end-$time_start,l);
}
test_include();
循环100次，用include
total time:3.7502920627594
3.总结
用include_once加载文件时同样的文件只加载一次，所以速度比较快，而如果用include，则需要每次加载同一个文件，增加了IO操作，所以速度就慢一些，用include_once的速度大概是用include的速度的98位，3.7502920627594/0.037981986999512=98.7387011。