date, microtime speed and calculate

• microtime
• time
• substr
• date
• date_create, DateTime::__construct()
• date_format, DateTime::format()

Code

<?php

$d1 = date('Y-m-d H:i:s').substr(microtime(), 1, 10);
$m1 = time().substr(microtime(), 1, 10);
$m2 = (double)(time().substr(microtime(), 1, 10));
$m3 = microtime(true);
$s1 = date_create()->format("Y-m-d H:i:s.u");
$s2 = date_create()->format("s.u");
$s3 = date_create()->format("c.u");
$s4 = date_create()->format("U.u");

usleep(100);

echo "\ndate1 : ". $d1;
echo "\nmicrotime1 : ". $m1;
echo "\nmicrotime2 : ". $m2;
echo "\nmicrotime3 : ". $m3;
echo "\ndate_create1 : ". $s1;
echo "\ndate_create2 : ". $s2;
echo "\ndate_create3 : ". $s3;
echo "\ndate_create4 : ". $s4;
echo "\n";
echo "\nnow - microtime2 : ". ((double)(time().substr(microtime(), 1, 10)) - $m2) ;
echo "\nnow - microtime3 : ". ( microtime(true)- $m3) ;
echo "\nnow - date_create2 : ". ( date_create()->format("s.u") - $s2) ;
echo "\nnow - date_create4 : ". ( date_create()->format("U.u") - $s4) ;
echo "\n";

Result

date1 : 2018-04-25 16:36:44.74041200
microtime1 : 1524643604.74042800
microtime2 : 1524643604.7404
microtime3 : 1524643604.7404
date_create1 : 2018-04-25 16:36:44.740468
date_create2 : 44.740489
date_create3 : 2018-04-25T16:36:44+08:30.740499
date_create4 : 1524643604.740509

now - microtime2 : 0.00031089782714844
now - microtime3 : 0.00030612945556641
now - date_create2 : 0.00028600000000267
now - date_create4 : 0.00029706954956055