use BitWasp\Buffertools\Buffer;
use BitWasp\Bitcoin\Transaction\OutPoint;
use BitWasp\Bitcoin\Script\Script;
use BitWasp\Bitcoin\Transaction\TransactionInput;

$txid = Buffer::hex('87f7b7639d132e9817f58d3fe3f9f65ff317dc780107a6c10cba5ce2ad1e4ea1');
$vout = 0;
$outpoint = new OutPoint($txid, $vout);

$sequence = TransactionInput::SEQUENCE_FINAL;
$script = new Script();
$input = new TransactionInput($outpoint, $script, $sequence);