SplFixedArray測試

The SplFixedArray class provides the main functionalities of array. The main differences between a SplFixedArray and a normal PHP array is that the SplFixedArray is of fixed length and allows only integers within the range as indexes. The advantage is that it allows a faster array implementation.

大概快40%。

可以使用pear的Benchmark來比較兩種之間執行時間上的差别（少資料量測試，多資料量如100000也差不多，記憶體占用也具有優勢）：

mark 03 1310263548.29697000 0.000016 11.27%

mark 04 1310263548.29699600 0.000026 18.31%

require_once 'Benchmark/Timer.php';

$timer = new Benchmark_Timer();

$timer->start();

$timer->setMarker('marker 01');

$arr = new SplFixedArray(5);

$arr[0] = 'one';

$arr[1] = 'two';

$arr[2] = 'three';

$arr[3] = 'four';

$arr[4] = 'five';

$timer->setMarker('mark 02');

$arr2 = array('one','two','three','four','five');

$timer->setMarker('mark 03');

print_r($arr);

$timer->setMarker('mark 04');

print_r($arr2);