PHP Quote Times

<?php

define('NUM_EXECUTIONS', 100000);

function timeFunc($function, $runs)
{
  $times = array();

  for ($i = 0; $i < $runs; $i++)
  {
    $time = microtime();
    call_user_func($function);
    $times[$i] = microtime() - $time;
  }

  return array_sum($times) / $runs;
}

function Method1()
{
  $foo = 'some words';
  for ($i = 0; $i < NUM_EXECUTIONS; $i++)
    $t = "these are 1";
}

function Method2()
 {
  $foo = 'some words';
  for ($i = 0; $i < NUM_EXECUTIONS; $i++)
    $t = "these are " . $foo;
}

function Method3()
{
  $foo = 'some words';
  for ($i = 0; $i < NUM_EXECUTIONS; $i++)
    $t = "these are $foo";
}

function Method4()
{
  $foo = 'some words';
  for ($i = 0; $i < NUM_EXECUTIONS; $i++)
    $t = "these are {$foo}";
}

print timeFunc('Method1', 10) . "\n";
print timeFunc('Method2', 10) . "\n";
print timeFunc('Method3', 10) . "\n";
print timeFunc('Method4', 10) . "\n";

?>