php的sleep(3);,PHP: sleep - Manual

An example of using sleep to run a set of functions at different intervals.  This is not a replacement for multi-threading, but it could help someone that wants to do something cheap.  You don't have to use eval().  It is just used as an example.  This is different than running a standard 1 second sleep loop, due to sleeping longer does not consume as much CPU.

functionfunction_b() { echo'function_b called @ '.date('h:i:s') .PHP_EOL; }

functionfunction_c() { echo'function_c called @ '.date('h:i:s') .PHP_EOL; }// Add some timers (in seconds) with function calls$sleeptimers= array();$sleeptimers['5'][0]['func'] ='function_a();';$sleeptimers['10'][0]['func'] ='function_b();';$sleeptimers['15'][0]['func'] ='function_c();';// Process the timerswhile(true) {$currenttime=time();reset($sleeptimers);$mintime=key($sleeptimers);

foreach($sleeptimersas$SleepTime=>$Jobs) {

foreach($Jobsas$JobIndex=>$JobDetail) {

if(!isset($JobDetail['lastrun'])) {$sleeptimers[$SleepTime][$JobIndex]['lastrun'] =time();

if($SleepTime

} elseif(($currenttime-$JobDetail['lastrun']) >=$SleepTime) {

eval($JobDetail['func']);$lastrun=time();$sleeptimers[$SleepTime][$JobIndex]['lastrun'] =$lastrun;$mysleeptime=$SleepTime- ($currenttime-$lastrun);

if($mysleeptime<0)$mysleeptime=0;

if(($currenttime-$JobDetail['lastrun'])

}

}

}

echo'Sleeping for '.$mintime.' seconds'.PHP_EOL;sleep($mintime);

}?>