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<?php |
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namespace BitWasp\Bitcoin\Transaction; |
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use BitWasp\Bitcoin\Bitcoin; |
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use BitWasp\Bitcoin\Collection\Transaction\TransactionInputCollection; |
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use BitWasp\Bitcoin\Collection\Transaction\TransactionOutputCollection; |
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use BitWasp\Bitcoin\Collection\Transaction\TransactionWitnessCollection; |
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use BitWasp\Bitcoin\Crypto\Hash; |
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use BitWasp\Bitcoin\Script\ScriptWitnessInterface; |
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use BitWasp\Bitcoin\Serializable; |
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use BitWasp\Bitcoin\Serializer\Transaction\OldTransactionSerializer; |
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use BitWasp\Bitcoin\Serializer\Transaction\TransactionSerializer; |
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use BitWasp\Bitcoin\Transaction\SignatureHash\Hasher; |
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use BitWasp\Bitcoin\Utxo\Utxo; |
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use BitWasp\Buffertools\BufferInterface; |
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use BitWasp\CommonTrait\FunctionAliasArrayAccess; |
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class Transaction extends Serializable implements TransactionInterface |
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{ |
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use FunctionAliasArrayAccess; |
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/** |
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* @var int |
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*/ |
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private $version; |
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/** |
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* @var TransactionInputCollection |
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*/ |
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private $inputs; |
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/** |
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* @var TransactionOutputCollection |
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*/ |
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private $outputs; |
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/** |
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* @var TransactionWitnessCollection |
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*/ |
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private $witness; |
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/** |
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* @var int |
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*/ |
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private $lockTime; |
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/** |
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* Transaction constructor. |
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* |
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* @param int $nVersion |
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* @param TransactionInputCollection|null $inputs |
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* @param TransactionOutputCollection|null $outputs |
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* @param TransactionWitnessCollection|null $witness |
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* @param int $nLockTime |
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*/ |
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public function __construct( |
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$nVersion = TransactionInterface::DEFAULT_VERSION, |
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TransactionInputCollection $inputs = null, |
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TransactionOutputCollection $outputs = null, |
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TransactionWitnessCollection $witness = null, |
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$nLockTime = 0 |
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) { |
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if ($nVersion > TransactionInterface::MAX_VERSION) { |
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throw new \InvalidArgumentException('Version must be less than ' . TransactionInterface::MAX_VERSION); |
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} |
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if ($nLockTime < 0 || $nLockTime > TransactionInterface::MAX_LOCKTIME) { |
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throw new \InvalidArgumentException('Locktime must be positive and less than ' . TransactionInterface::MAX_LOCKTIME); |
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} |
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$this->version = $nVersion; |
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$this->inputs = $inputs ?: new TransactionInputCollection(); |
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$this->outputs = $outputs ?: new TransactionOutputCollection(); |
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$this->witness = $witness ?: new TransactionWitnessCollection(); |
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$this->lockTime = $nLockTime; |
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$this |
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->initFunctionAlias('version', 'getVersion') |
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->initFunctionAlias('inputs', 'getInputs') |
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->initFunctionAlias('outputs', 'getOutputs') |
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->initFunctionAlias('locktime', 'getLockTime'); |
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} |
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/** |
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* @return Transaction |
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*/ |
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public function __clone() |
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{ |
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$this->inputs = clone $this->inputs; |
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$this->outputs = clone $this->outputs; |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getTxHash() |
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{ |
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return Hash::sha256d($this->getBuffer()); |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getTxId() |
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{ |
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return $this->getTxHash()->flip(); |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getWitnessTxId() |
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{ |
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return Hash::sha256d($this->getWitnessBuffer())->flip(); |
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} |
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/** |
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* @return int |
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*/ |
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public function getVersion() |
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{ |
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return $this->version; |
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} |
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/** |
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* Get the array of inputs in the transaction |
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* |
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* @return TransactionInputCollection |
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*/ |
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public function getInputs() |
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{ |
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return $this->inputs; |
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} |
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/** |
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* @param int $index |
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* @return TransactionInputInterface |
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*/ |
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public function getInput($index) |
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{ |
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return $this->inputs[$index]; |
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} |
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/** |
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* Get Outputs |
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* |
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* @return TransactionOutputCollection |
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*/ |
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public function getOutputs() |
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{ |
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return $this->outputs; |
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} |
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/** |
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* @param int $vout |
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* @return TransactionOutputInterface |
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*/ |
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public function getOutput($vout) |
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{ |
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return $this->outputs[$vout]; |
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} |
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/** |
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* @return TransactionWitnessCollection |
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*/ |
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public function getWitnesses() |
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{ |
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return $this->witness; |
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} |
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/** |
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* @return ScriptWitnessInterface |
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*/ |
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public function getWitness($index) |
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{ |
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return $this->witness[$index]; |
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} |
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/** |
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* @param int $vout |
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* @return OutPointInterface |
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*/ |
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public function makeOutpoint($vout) |
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{ |
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$this->getOutput($vout); |
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return new OutPoint($this->getTxId(), $vout); |
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} |
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/** |
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* @param int $vout |
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* @return Utxo |
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*/ |
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public function makeUtxo($vout) |
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{ |
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return new Utxo(new OutPoint($this->getTxId(), $vout), $this->getOutput($vout)); |
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} |
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/** |
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* Get Lock Time |
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* |
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* @return int |
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*/ |
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public function getLockTime() |
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{ |
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return $this->lockTime; |
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} |
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/** |
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* @return Hasher |
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*/ |
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public function getSignatureHash() |
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{ |
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return new Hasher($this); |
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} |
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/** |
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* @return int|string |
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*/ |
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public function getValueOut() |
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{ |
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$math = Bitcoin::getMath(); |
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$value = gmp_init(0); |
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foreach ($this->outputs as $output) { |
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$value = $math->add($value, gmp_init($output->getValue())); |
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} |
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return gmp_strval($value, 10); |
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} |
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/** |
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* @return bool |
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*/ |
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public function isCoinbase() |
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{ |
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return count($this->inputs) === 1 && $this->getInput(0)->isCoinBase(); |
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} |
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/** |
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* @param TransactionInterface $tx |
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* @return bool |
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*/ |
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public function equals(TransactionInterface $tx) |
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{ |
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$version = gmp_cmp($this->version, $tx->getVersion()); |
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if ($version !== 0) { |
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return false; |
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} |
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$nIn = count($this->inputs); |
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$nOut = count($this->outputs); |
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$nWit = count($this->witness); |
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if ($nIn !== count($tx->getInputs()) || $nOut !== count($tx->getOutputs()) || $nWit !== count($tx->getWitnesses())) { |
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return false; |
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} |
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for ($i = 0; $i < $nIn; $i++) { |
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if (false === $this->getInput($i)->equals($tx->getInput($i))) { |
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return false; |
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} |
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} |
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for ($i = 0; $i < $nOut; $i++) { |
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if (false === $this->getOutput($i)->equals($tx->getOutput($i))) { |
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return false; |
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} |
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} |
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for ($i = 0; $i < $nWit; $i++) { |
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if (false === $this->getWitness($i)->equals($tx->getWitness($i))) { |
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return false; |
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} |
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} |
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return gmp_cmp($this->lockTime, $tx->getLockTime()) === 0; |
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} |
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/** |
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* @return Validator |
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*/ |
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public function validator() |
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{ |
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return new Validator($this); |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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105 |
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public function getBuffer() |
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{ |
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return (new OldTransactionSerializer())->serialize($this); |
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} |
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/** |
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* @return BufferInterface |
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*/ |
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public function getWitnessBuffer() |
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{ |
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return (new TransactionSerializer())->serialize($this); |
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} |
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} |
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PHP Analyzer performs a side-effects analysis of your code. A side-effect is basically anything that might be visible after the scope of the method is left.
Let’s take a look at an example:
If we look at the
getEmail()method, we can see that it has no side-effect. Whether you call this method or not, no future calls to other methods are affected by this. As such code as the following is useless:On the hand, if we look at the
setEmail(), this method _has_ side-effects. In the following case, we could not remove the method call: