images/directory listing script

Also, I think that:
"stuff\n";
would be faster than:
'stuff'."\n";

(Though yes, 'stuff' is faster than "stuff")

Code:

---

<?php
  function avg($arr) {
    $total = 0;
    for($i = 0; $i < count($arr); ++$i)
      $total += $arr[$i];
    return $total / count($arr);
  }

  $times1 = array();
  $times2 = array();
  for($i = 0; $i < 10000; ++$i) {
    $s = microtime();
    'Hello' . "\n";
    array_push($times1, microtime() - $s);
    $s = microtime();
    "Hello\n";
    array_push($times2, microtime() - $s);
  }

  echo 'Average for single/double concatenation: ' . avg($times1) . "\n" .
    'Average for only double: ' . avg($times2) . "\n";
?>

---

Output:

Code:

---

Average for single/double concatenation: 1.7569E-06
Average for only double: 1.6627E-06

---

It is.