要实现区块链数字资产管理和转移，需要以下步骤：
使用PHP创建一个区块链，每个区块包含一个数字资产的交易记录。
class Block {
public $index;
public $timestamp;
public $data;
public $previousHash;
public $hash;
}使用PHP创建数字资产，每个数字资产都有一个唯一的ID。
class DigitAsset {
public $id;
public $owner;
public $value;
}使用PHP创建一个交易，将数字资产从一个所有者转移到另一个所有者。
class Transaction {
public $sender;
public $receiver;
public $digitAssetId;
}将交易添加到区块链中的最新区块中。
class Blockchain {
private $chain = array();
private $pendingTransactions = array();
public function createNewBlock($nonce, $previousHash, $hash) {
$newBlock = new Block();
$newBlock->index = count($this->chain) + 1;
$newBlock->timestamp = time();
$newBlock->data = $this->pendingTransactions;
$newBlock->previousHash = $previousHash;
$newBlock->hash = $hash;
$this->pendingTransactions = array();
$this->chain[] = $newBlock;
}
public function addTransaction($sender, $receiver, $digitAssetId) {
$newTransaction = new Transaction();
$newTransaction->sender = $sender;
$newTransaction->receiver = $receiver;
$newTransaction->digitAssetId = $digitAssetId;
$this->pendingTransactions[] = $newTransaction;
}
}以上是实现区块链数字资产管理和转移的基本步骤，可以根据实际需求进行扩展。