compare-else-noelse.php

<?php
// See http://stackoverflow.com/questions/4465046/whats-faster-ifreturnelse-return-or-ifreturn-return

function else1($x) {
  if ($x === true) {
    return true;
  }
  else {
    return false;
  }
}

function else0($x) {
  if ($x === true) {
    return true;
  }
  return false;
}

call_user_func(function() {
  $n = 10000000;
  $dts_else1 = [];
  $dts_else0 = [];
  $t = microtime(true);
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $t = ($dts_else1[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else0(true);
    else0(false);
  }
  $t = ($dts_else0[] = microtime(true) - $t) + $t;
  for ($i = 0; $i < $n; ++$i) {
    else1(true);
    else1(false);
  }
  $dts_else1[] = microtime(true) - $t;

  sort($dts_else0);
  sort($dts_else1);

  assert(count($dts_else0) === count($dts_else1));

  $ratios = [];
  $logs = [];
  foreach ($dts_else0 as $i_dt => $dt_else0) {
    $ratios[] = $ratio = $dts_else1[$i_dt] / $dt_else0;
    $logs[] = log($ratio) * 1000;
  }

  print "else / no_else\n";

  print_r($ratios);

  print_r($logs);
});