คำสำคัญ : php short 25

<?php
$gap = 0;
xTime("start"); // start process
for($i=1;$i<=5;$i++) sleep(1); // Delay 5 seconds
xtime("stop"); // stop process
echo number_format($gap,9) . " seconds"; // 9
// function for [start] and [stop]
function xTime ($action) {
  global $gap;
  list($microsecond,$second) = preg_split('/ /',microtime());  
  // echo $microsecond; // 0.61209100
  if ($action == "start") 
    $gap = $second + $microsecond;  
  else 
    $gap = $second + $microsecond - $gap;
}
?>
Test on PHP 5.6, 7.0 at http://phptester.net/
Gap = 5.000725985 seconds

<?php
srand(time());
/* 1: Main Loop (test for [while] and [for] that swap 100 times) */
$gap = 0; 
$gap1 = 0; $gap2 = 0; $gap3 = 0;
$cnt1 = 0; $cnt2 = 0; $cnt3 = 0;
for($num=1;$num<=3000000;$num++){
	$option = rand() % 3;
	switch($option){
		case 0:
			// Process #1 : for
			xTime("start"); 
			pro1();
			$gap1 += number_format(xTime("stop"),9); // ทศนิยม 9 ตำแหน่ง
			$cnt1++;
		break;
		case 1:
			// Process #2 : while () {}
			xTime("start");
			pro2();
			$gap2 += number_format(xTime("stop"),9);
			$cnt2++;
		break;
		case 2:
			// Process #3 : do {} while();
			xTime("start");
			pro3();
			$gap3 += number_format(xTime("stop"),9);		
			$cnt3++;
		break;
	}
}	
/* 2: Result Display */
echo "Time of for(){} : $gap1 seconds with $cnt1 times<br/>";
echo "Time of while(){} : $gap2 seconds with $cnt2 times<br/>";
echo "Time of do{} while() : $gap3 seconds with $cnt3 times<br/>";
/* 3: Function area */
function xTime ($action) {
  global $gap;
  list($microsecond,$second) = preg_split("/[ ]/",microtime());  
  if ($action == "start") 
    $gap = $second + $microsecond;  
  else
    $gap = $second + $microsecond - $gap;
  return $gap;
}
/* 3: Function area */
function pro1(){ for($i=1;$i<=10;$i++) { } }
function pro2(){ $j=0; while($j < 10) { $j++; }	}
function pro3(){ $k=0; do { $k++; } while ($k < 10);
}
?>

<?php
srand(time());
$gap1=0; $gap2=0;
$cnt1=0; $cnt2=0;
for($num=1;$num<=1000000;$num++){
	if(rand() % 2 == 0)
		$gap1 += xTime(process1(start()));
	else		
		$gap2 += xTime(process2(start()));
}
//
echo "Time of for :  $gap1 microseconds with $cnt1 times<br/>";
echo "Time of while :  $gap2  microseconds with $cnt2 times<br/>";
//		
function process1 ($start) {
  	global $cnt1;	
	$cnt1++;
	for($i=1;$i<=100;$i++) { }
	return $start; 
}
function process2 ($start) {
	global $cnt2;	
	$cnt2++;
	$j=0; while($j < 100) { $j++; }
 	return $start;
}
function start() {  
  list($microsecond,$second) = preg_split("/[ ]/",microtime());  
  $start = $second + $microsecond;  
  return $start;
}
function xTime ($start) {  
  list($microsecond,$second) = preg_split("/[ ]/",microtime());  
  return number_format($second + $microsecond - $start,9);
}
?>

<?php
srand(time());
$gap1=0; $gap2=0;
for($num=1;$num<=1000000;$num++){
	if(rand() % 2 == 0)
		$gap1 += process1(start());
	else		
		$gap2 += process2(start());
}
//
echo "Time of '' :  $gap1 microseconds<br/>";
echo 'Time of "" :'."  $gap2  microseconds<br/>";
//		
function process1 ($start) {
	$x = '0 ' . $start . ' 1';
	// $x = '0  1'; // this is different
	list($microsecond,$second) = preg_split("/[ ]/",microtime());  
	return number_format($second + $microsecond - $start,9);	
}
function process2 ($start) {
	$x = "0 $start 1";
	list($microsecond,$second) = preg_split("/[ ]/",microtime());  
	return number_format($second + $microsecond - $start,9);	
}
function start() {  
	list($microsecond,$second) = preg_split("/[ ]/",microtime());  
	$start = $second + $microsecond;  
	return $start;
}
?>