Source code for: http://daveyshafik.com/archives/30320-faster-arrays.html

1-spl-fixed-array.php

<?php
$array = new SplFixedArray($size);
$array[0] = 'foo';
$array[1] = 'bar';
...
$array[100000] = 'baz';
?>

2-benchmark.php

<?php
$size = 1000;

// Regular Array
$array = array();

// Write
for($i = 0; $i < $size; $i++) {
  $array[$i] = $i;
}

// Read
for($i = 0; $i < $size; $i++) {
  $value = $array[$i];
}

// Fixed Array
$fixedArray = new SplFixedArray($size);

// Write
for($i = 0; $i < $size; $i++) {
  $fixedArray[$i] = $i;
}

// Read
for($i = 0; $i < $size; $i++) {
  // do nothing
  $value = $fixedArray[$i];
}
?>

3-pdo-example.php

<?php
$pdo = new PDO(...);

$sql = "SELECT * FROM table WHERE column = :value";
$query = $pdo->prepare($sql);

$values = array(':value' => 'foo');
$result = $query->execute($values);

$count = $query->rowCount();

$rows = $query->fetchAll(...); // It would be great if $rows could be an SplFixedArray...
?>

4-even-filter-example.php

<?php
class EvenFilterIterator extends FilterIterator {
  /**
   * Accept only even-keyed values
   * 
   * @return bool
   */
  public function accept()
  {
    // Get the actual iterator
    $iterator = $this->getInnerIterator();
    
    // Get the current key
    $key = $iterator->key();
    
    // Check for even keys    
    if ($key % 2 == 0) {
      return true;
    }
    
    return false;
  }
}
?>

5-even-filter-example-cont.php

<?php
$iterator = new ArrayIterator($array);

$filter = new EvenFilterIterator($iterator);

foreach ($filter as $key => $val) {
    $value = $val;
}
?>