<?php
$time_start = microtime(true);
$now = new DateTime();

for($i=0;$i<50000;$i++){
    $date = new DateTime('1993-11-17');
    $interval = $now->diff($date);
    $age = $interval->y.$interval->m.$interval->d;
}
$time_end = microtime(true);
$time = $time_end - $time_start;
echo "<br><center>time classes: ".$time."</center>";

$time_start = microtime(true);
for($i=0;$i<50000;$i++){
$ageY = date("Y")-1993;
$ageM = date("n")-11;
$ageD = date("j")-17;
if($ageD < 0){
    $ageD = $ageD += date("t");
    $ageM--;
}
if($ageM < 0){
    $ageM+=12;
    $ageY--;
}
$age = $ageY."/".$ageM."/".$ageD;

}
$time_end = microtime(true);
$time = $time_end - $time_start;
echo "<br><center>time functions: ".$time."</center>";

gc_disable();

$time_start = microtime(true);
$now = new DateTime();

for($i=0;$i<50000;$i++){
    $date = new DateTime('1993-11-17');
    $interval = $now->diff($date);
    $age = $interval->y.$interval->m.$interval->d;
}
$time_end = microtime(true);
$time = $time_end - $time_start;
echo "<br><center>time classes no gc: ".$time."</center>";

?>