prop_access.php

<?php
class C1 {
	public $x = 0;
	public $y = 0;
}

class C2 {
	public $x = 0;
	public int $y = 0;
}

class C3 {
	public int $x = 0;
	public int $y = 0;
}

function write_prop($n, $obj) {
	for ($i = 0; $i < $n; ++$i) {
		$a = 2;
		$obj->x = $a;
	}
}

function assign_op_prop($n, $obj) {
	for ($i = 0; $i < $n; ++$i) {
		$obj->x += 2;
	}
}

function pre_inc_prop($n, $obj) {
	for ($i = 0; $i < $n; ++$i) {
		$z = ++$obj->x;
	}
}

function post_inc_prop($n, $obj) {
	for ($i = 0; $i < $n; ++$i) {
		$z = $obj->x++;
	}
}

function empty_loop($n) {
	for ($i = 0; $i < $n; ++$i) {
	}
}

function getmicrotime()
{
  $t = gettimeofday();
  return ($t['sec'] + $t['usec'] / 1000000);
}

function start_test()
{
  ob_start();
  return getmicrotime();
}

function end_test($start, $name, $overhead = null)
{
  global $total;
  global $last_time;
  $end = getmicrotime();
  ob_end_clean();
  $last_time = $end-$start;
  $total += $last_time;
  $num = number_format($last_time,3);
  $pad = str_repeat(" ", 24-strlen($name)-strlen($num));
  if (is_null($overhead)) {
    echo $name.$pad.$num."\n";
  } else {
    $num2 = number_format($last_time - $overhead,3);
    echo $name.$pad.$num."    ".$num2."\n";
  }
  ob_start();
  return getmicrotime();
}

function total()
{
  global $total;
  $pad = str_repeat("-", 24);
  echo $pad."\n";
  $num = number_format($total,3);
  $pad = str_repeat(" ", 24-strlen("Total")-strlen($num));
  echo "Total".$pad.$num."\n";
}

const N = 10000000;

$t0 = $t = start_test();
empty_loop(N);
$t = end_test($t, 'empty_loop');
$overhead = $last_time;
write_prop(N, new C1);
$t = end_test($t, 'write untyped',  $overhead);
write_prop(N, new C2);
$t = end_test($t, 'write untyped*', $overhead);
write_prop(N, new C3);
$t = end_test($t, 'write typed',    $overhead);
assign_op_prop(N, new C1);
$t = end_test($t, '+= untyped',  $overhead);
assign_op_prop(N, new C2);
$t = end_test($t, '+= untyped*', $overhead);
assign_op_prop(N, new C3);
$t = end_test($t, '+= typed',    $overhead);
pre_inc_prop(N, new C1);
$t = end_test($t, 'pre_inc untyped',  $overhead);
pre_inc_prop(N, new C2);
$t = end_test($t, 'pre_inc untyped*', $overhead);
pre_inc_prop(N, new C3);
$t = end_test($t, 'pre_inc typed',    $overhead);
post_inc_prop(N, new C1);
$t = end_test($t, 'post_inc untyped',  $overhead);
post_inc_prop(N, new C2);
$t = end_test($t, 'post_inc untyped*', $overhead);
post_inc_prop(N, new C3);
$t = end_test($t, 'post_inc typed',    $overhead);
total();

prop_access0.php

<?php
class C1 {
	public $x = 0;
	public $y = 0;
}

function write_prop($n, $obj) {
	for ($i = 0; $i < $n; ++$i) {
		$a = 2;
		$obj->x = $a;
	}
}

function assign_op_prop($n, $obj) {
	for ($i = 0; $i < $n; ++$i) {
		$obj->x += 2;
	}
}

function pre_inc_prop($n, $obj) {
	for ($i = 0; $i < $n; ++$i) {
		$z = ++$obj->x;
	}
}

function post_inc_prop($n, $obj) {
	for ($i = 0; $i < $n; ++$i) {
		$z = $obj->x++;
	}
}

function empty_loop($n) {
	for ($i = 0; $i < $n; ++$i) {
	}
}

function getmicrotime()
{
  $t = gettimeofday();
  return ($t['sec'] + $t['usec'] / 1000000);
}

function start_test()
{
  ob_start();
  return getmicrotime();
}

function end_test($start, $name, $overhead = null)
{
  global $total;
  global $last_time;
  $end = getmicrotime();
  ob_end_clean();
  $last_time = $end-$start;
  $total += $last_time;
  $num = number_format($last_time,3);
  $pad = str_repeat(" ", 24-strlen($name)-strlen($num));
  if (is_null($overhead)) {
    echo $name.$pad.$num."\n";
  } else {
    $num2 = number_format($last_time - $overhead,3);
    echo $name.$pad.$num."    ".$num2."\n";
  }
  ob_start();
  return getmicrotime();
}

function total()
{
  global $total;
  $pad = str_repeat("-", 24);
  echo $pad."\n";
  $num = number_format($total,3);
  $pad = str_repeat(" ", 24-strlen("Total")-strlen($num));
  echo "Total".$pad.$num."\n";
}

const N = 10000000;

$t0 = $t = start_test();
empty_loop(N);
$t = end_test($t, 'empty_loop');
$overhead = $last_time;
write_prop(N, new C1);
$t = end_test($t, 'write untyped',  $overhead);
assign_op_prop(N, new C1);
$t = end_test($t, '+= untyped',  $overhead);
pre_inc_prop(N, new C1);
$t = end_test($t, 'pre_inc untyped',  $overhead);
post_inc_prop(N, new C1);
$t = end_test($t, 'post_inc untyped',  $overhead);
total();