为了强制执行max_execution_time限制,PHP必须跟踪特定脚本所使用的CPU时间。
是否有一种方法可以在脚本中访问它?我希望在测试中包含一些关于实际PHP中消耗了多少CPU的日志记录(当脚本等待数据库时,时间不会增加)。
我用的是Linux机顶盒。
为了强制执行max_execution_time限制,PHP必须跟踪特定脚本所使用的CPU时间。
是否有一种方法可以在脚本中访问它?我希望在测试中包含一些关于实际PHP中消耗了多少CPU的日志记录(当脚本等待数据库时,时间不会增加)。
我用的是Linux机顶盒。
当前回答
如果你像这样格式化秒的输出,它会更漂亮:
echo "Process took ". number_format(microtime(true) - $start, 2). " seconds.";
将打印
Process took 6.45 seconds.
这比
Process took 6.4518549156189 seconds.
其他回答
我写了一个检查剩余执行时间的函数。
警告:执行时间计数在Windows和Linux平台上是不同的。
/**
* Check if more that `$miliseconds` ms remains
* to error `PHP Fatal error: Maximum execution time exceeded`
*
* @param int $miliseconds
* @return bool
*/
function isRemainingMaxExecutionTimeBiggerThan($miliseconds = 5000) {
$max_execution_time = ini_get('max_execution_time');
if ($max_execution_time === 0) {
// No script time limitation
return true;
}
if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
// On Windows: The real time is measured.
$spendMiliseconds = (microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"]) * 1000;
} else {
// On Linux: Any time spent on activity that happens outside the execution
// of the script such as system calls using system(), stream operations
// database queries, etc. is not included.
// @see http://php.net/manual/en/function.set-time-limit.php
$resourceUsages = getrusage();
$spendMiliseconds = $resourceUsages['ru_utime.tv_sec'] * 1000 + $resourceUsages['ru_utime.tv_usec'] / 1000;
}
$remainingMiliseconds = $max_execution_time * 1000 - $spendMiliseconds;
return ($remainingMiliseconds >= $miliseconds);
}
使用:
while (true) {
// so something
if (!isRemainingMaxExecutionTimeBiggerThan(5000)) {
// Time to die.
// Safely close DB and done the iteration.
}
}
$_SERVER[REQUEST_TIME“]
看看这个。即。
...
// your codes running
...
echo (time() - $_SERVER['REQUEST_TIME']);
如果你需要的是挂钟时间,而不是CPU执行时间,那么计算起来很简单:
//place this before any script you want to calculate time
$time_start = microtime(true);
//sample script
for($i=0; $i<1000; $i++){
//do anything
}
$time_end = microtime(true);
//dividing with 60 will give the execution time in minutes otherwise seconds
$execution_time = ($time_end - $time_start)/60;
//execution time of the script
echo '<b>Total Execution Time:</b> '.$execution_time.' Mins';
// if you get weird results, use number_format((float) $execution_time, 10)
注意,这将包括PHP等待外部资源(如磁盘或数据库)的时间,而max_execution_time没有使用这个时间。
如果你像这样格式化秒的输出,它会更漂亮:
echo "Process took ". number_format(microtime(true) - $start, 2). " seconds.";
将打印
Process took 6.45 seconds.
这比
Process took 6.4518549156189 seconds.
要显示分钟和秒,您可以使用:
$startTime = microtime(true);
$endTime = microtime(true);
$diff = round($endTime - $startTime);
$minutes = floor($diff / 60); //only minutes
$seconds = $diff % 60;//remaining seconds, using modulo operator
echo "script execution time: minutes:$minutes, seconds:$seconds"; //value in seconds