PHP Switch Benchmark

gistfile1.aw

<?php

$iterations = 10000;
$options = array('apple', 'banana', 'carrot' ,'date', 'endive');
$color = NULL;

// Fill an array with random keys. This ensures
// that (a) we use the same keys, and (b)
// slowness in the randomizer doesn't impact the
// loops (which can happen if entropy collection kicks in)
$samples = array();
for ($i = 0; $i < $iterations; ++$i) {
  $samples[] = $options[rand(0, 4)];
}

// Test a switch statement.
$start_switch = microtime(TRUE);

for ($i = 0; $i < $iterations; ++$i) {
  $option = $samples[$i];
  switch ($option) {
    case 'apple':
      $color = 'red';
      break;
    case 'banana':
      $color = 'yellow';
      break;
    case 'carrot':
      $color = 'orange';
      break;
    case 'date':
      $color = 'brown';
      break;
    ##case 'endive':
    ##  $color = 'green';
    ##  break;
    default:
      $color = 'green';
  }
}
$end_switch = microtime(TRUE);

$total_switch = $end_switch - $start_switch;
printf("Switch:\t%0.6f sec to process %d" . PHP_EOL, $total_switch, $iterations);

// Test an array lookup.
$start_map = microtime(TRUE);
$map = array(
  'apple' => 'red', 
  'banana' => 'yellow', 
  'carrot' => 'orange',
  'date' => 'brown', 
  //'endive' => 'green'
);
for ($i = 0; $i < $iterations; ++$i) {
  $option = $samples[$i];
  if (isset($map[$option])) {
    $color = $map[$option];
  }
  else {
    $color = 'green';
  }
}
$end_map = microtime(TRUE);

$total_map = $end_map - $start_map;
printf("Map:\t%0.6f sec to process %d" . PHP_EOL, $total_map, $iterations);