/**
* @param int $offset
* @return mixed
*/
public function offsetGet($offset)
{
if (!$this->set->offsetExists($offset)) {
throw new \OutOfRangeException('Nothing found at this offset');
}
return $this->set->offsetGet($offset);
}
protected function extract($format, $offset, $length)
{
$encoded = '';
for ($i = 0; $i < $length; $i++) {
$encoded .= $this->buffer->offsetGet($offset + $i);
}
if ($format == 'N' && PHP_INT_SIZE <= 4) {
list(, $h, $l) = unpack('n*', $encoded);
$result = $l + $h * 0x10000;
} else {
if ($format == 'V' && PHP_INT_SIZE <= 4) {
list(, $h, $l) = unpack('v*', $encoded);
$result = $h + $l * 0x10000;
} else {
list(, $result) = unpack($format, $encoded);
}
}
return $result;
}
<?php
$array = new SplFixedArray(5);
$array[0] = 'a';
$a = $array->offsetGet();
if (is_null($a)) {
echo 'PASS';
}
public function offsetGet($n)
{
echo "A::offsetGet\n";
return parent::offsetGet($n);
}
// 获得当前节点 $array->current(); // next() // 指针移动到下一个节点 $array->next(); // setSize(int $size) // 重新设置阵列数组的大小 $array->setSize(10); // getSize() // 获得阵列数组的大小 $array->getSize(); // offsetExists(int $index) // 判断该索引是否存在值，返回boolean $array->offsetExists(3); // offsetGet(int $index) // 获得该索引对应的值 $array->offsetGet(3); // offsetSet(int $index, mixed $value) // 设置该索引对应的值 $array->offsetSet(6, 'value3'); // offsetUnset(int $index) // 删除该索引对应的值 $array->offsetUnset(6); // toArray() // 将阵列转化成php数组 // output: Array ( [0] => [1] => 2 [2] => [3] => value2 [4] => [5] => [6] => [7] => [8] => [9] => ) $php_array = $array->toArray(); // fromArray($php_array) // 将php数组转化成阵列 // output: SplFixedArray Object ( [0] => [1] => 2 [2] => [3] => value2 [4] => [5] => [6] => [7] => [8] => [9] => ) $spl_array = SplFixedArray::fromArray($php_array);
