Comparing str_replace versus preg_quote

escape_perf.php

<?php

  $namespace = 'Doctrine\Common\Annotations\Annotation\Attribute';
  $it = 5;
  $c = 1000000;

  sleep(3);
  $tm = microtime(1);
  $sum = 0;
  for ($t = 0; $t < $it; $t++)
  {
    $m = microtime(1);
    for ($i = 0; $i < $c; $i++) $val = str_replace('\\', '\\\\', $namespace);
    printf("Test %2d: %.4f\n", $t + 1, $run = microtime(1) - $m);
    $sum += $run;
  }
  printf("Elapsed (str_replace): %.4f (avg: %.4f)\n", microtime(1) - $tm, $sum / $it);

  echo PHP_EOL;

  $tm = microtime(1);
  $sum = 0;
  for ($t = 0; $t < $it; $t++)
  {
    $m = microtime(1);
    for ($i = 0; $i < $c; $i++) $val = preg_quote($namespace);
    printf("Test %2d: %.4f\n", $t + 1, $run = microtime(1) - $m);
    $sum += $run;
  }
  printf("Elapsed (preg_quote): %.4f (avg: %.4f)\n", microtime(1) - $tm, $sum / $it);