php检测服务器的运行能力_PHP教程

// 检测函数支持
function isfun($funName) {
return (false !== function_exists($funName))?'支持':'不支持';
}

//整数运算能力测试
function test_int() {
$timeStart = gettimeofday();
for($i = 0; $i < 3000000; $i++) {
$t = 1+1;
}
$timeEnd = gettimeofday();
$time = ($timeEnd["usec"]-$timeStart["usec"])/1000000+$timeEnd["sec"]-$timeStart["sec"];
$time = round($time, 3)."秒";
return $time;
}

//浮点运算能力测试
function test_float() {
//得到圆周率值
$t = pi();
$timeStart = gettimeofday();
for($i = 0; $i < 3000000; $i++) {
//开平方
sqrt($t);
}
$timeEnd = gettimeofday();
$time = ($timeEnd["usec"]-$timeStart["usec"])/1000000+$timeEnd["sec"]-$timeStart["sec"];
$time = round($time, 3)."秒";
return $time;
}

//IO能力测试
function test_io() {
$fp = @fopen(PHPSELF, "r");
$timeStart = gettimeofday();
for($i = 0; $i < 10000; $i++) {
@fread($fp, 10240);
@rewind($fp);
}
$timeEnd = gettimeofday();
@fclose($fp);
$time = ($timeEnd["usec"]-$timeStart["usec"])/1000000+$timeEnd["sec"]-$timeStart["sec"];
$time = round($time, 3)."秒";
return($time);
}

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