<?php
function benchmark_testi ()
 {
 $m_zaman = microtime();
 $m_zaman = explode (" ",$m_zaman);
 $m_zaman = doubleval ($m_zaman[1]) + doubleval ($m_zaman[0]);
 return ($m_zaman);
 }
$zaman1 = benchmark_testi ();

for ($i=1;$i<1000;$i++){ ?>

<?php /* bla bla bla*/ ?>

<?php }

$zaman2 = benchmark_testi ();

echo $zaman2-$zaman1;
?>

Ortalama : 0.00035 sn

<?php
function benchmark_testi ()
 {
 $m_zaman = microtime();
 $m_zaman = explode (" ",$m_zaman);
 $m_zaman = doubleval ($m_zaman[1]) + doubleval ($m_zaman[0]);
 return ($m_zaman);
 }
$zaman1 = benchmark_testi ();

for ($i=1;$i<1000;$i++){  }

$zaman2 = benchmark_testi ();

echo $zaman2-$zaman1;
?>

Ortalama: 0.00020 sn

Aradaki fark: 0.00015 sn

Kaynak: http://soulmy.net/php-ile-benchmark-testi-uygulamasi-yapalim/