PHP virtual currency module design
EOS: EOS can be understood as enterprise operation system, which is a blockchain operating system designed for commercial distributed applications. EOS is a new blockchain architecture introced by EOS software, which aims to realize the performance expansion of distributed applications. Note that it is not a currency like bitcoin and Ethereum, but a token based on the EOS software project, known as blockchain 3.0
The main features of 
EOS are as follows:
1. EOS is a bit similar to Microsoft's windows platform. By creating a developer friendly underlying platform of blockchain, it supports multiple applications to run at the same time and provides the underlying template for the development of DAPP
EOS solves the problems of delay and data throughput by means of parallel chain and dpos. EOS can process thousands of data per second, while bitcoin has about 7 transactions per second, and Ethereum has 30-40 transactions per second There is no service charge for EOS, and the general audience is more extensive. The network and computing resources needed to develop DAPP on EOS are allocated according to the proportion of EOS owned by developers. When you have EOS, it is equivalent to having computer resources. With the development of DAPP, you can lease your EOS to others. From this point alone, EOS has a wide range of value. To put it simply, if you have an EOS, it is equivalent to having a set of rent to collect rent for others, or having a piece of land to rent for others to build a house. Digital currency exchange "currency exchange"
development prospects
through a more in-depth understanding of EOS, EOS is quite valuable for investment. First of all, as the first to launch smart contracts, ETH runs smart contracts on eth, which is not free and depends on your gas. If gas runs out, the contract will stop. According to people who have used eth trading platform, it runs slowly and is very expensive, However, there is no such problem in EOS. The operation contract on EOS depends on the number of EOS you have. The more EOS you have, the more you can rent. With the continuous development, the more expensive the price will be; Secondly, it's very simple to develop DAPP on EOS, and you don't need to write many moles, because EOS itself builds the bottom mole for developers, which provides a platform and greatly reces the threshold of development; Thirdly, as an ordinary investor, owning EOS is equivalent to owning real estate, which can be used to rent and earn money. With the development of DAPP, the number of users increases, and the price increases irresistibly
let me analyze it:
1: bitcoin has been broken in China, and its price has dropped sharply, which is unexpected by the global mining pool
2: compared with the current mining cost of bitcoin, it makes money entirely by cheap electricity bills
3: there are only 21 million bitcoins, and most of them have been g up in the early stage, which makes it difficult to dig those bitcoins that have not been g up in the future, and there is too much competition. Many small mines are in a state of loss
and why do many well-known mines turn to TCD
first of all, bitcoin is the optimized and upgraded version of bitcoin, with a constant number of 100 million. The early mining is very good. Unlike bitcoin, which has too high cost and low cost performance ratio, it is appropriate to use bitcoin as a supplement to compare bitcoin. Bitcoin is used for large amount payment and bitcoin is used for small amount payment.
The world's currencies are as follows:
1. China: RMB (#)
the legal currency of the people's Republic of China is RMB, and the people's Bank of China is the national authority in charge of the management of RMB, which is responsible for the design, printing and issuance of RMB. The unit of RMB is yuan, and the subsidiary currency units of RMB are Jiao and Fen. 1 yuan equals 10 Jiao, and 1 jiao equals 10 Fen. The symbol of RMB is the initial letter Y of yuan plus two horizontal lines, that is "&#"
In addition to the complete implementation of bitcoin's core protocol, bitcoin node software also includes an optional but important function mole -- Wallet:
you can regard the wallet as a safe to store all your keys and addresses, and also encapsulate many technical concepts and details of bitcoin, So that it can be understood and accepted by people other than geeks. Therefore, bitcoin enables node wallet by default. If you want to disable the wallet function, for example, you can set the disablewallet option in the configuration file:
disablewallet = 1
the wallet mole will track all address related transactions managed by it, so it can update the balance information of the wallet in time. This function is very important because there is no concept of account in bitcoin. Bitcoin is e-cash scattered among transactions. If there is no wallet to help track transactions related to our address, it is difficult to figure out how many bitcoins we hold in total
Many RPC calls provided bynodes are implemented by wallet mole. For example, when we call the getnewaddress command, the wallet mole generates the key and address and automatically adds them to the wallet, so its related transactions will automatically affect the balance of the wallet. Similarly, when we call getbalance, the wallet mole will collect the bitcoin on all addresses and return the total amount
the above content is extracted from: bitcoin development course
if you don't understand, I suggest you learn it;
<? php
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for($y=0;$ y<= 100;$ y++){//1元[UNK][UNK][UNK][UNK][UNK] 最[UNK][UNK][UNK][UNK][UNK]100张
if(($s+$w+$y)==20&& amp;( 10*$s)+(5*$w)+(1*$y)==100){//$snot$i
echo$s,"& quot;,$ w, "& quot;,$ y;// echo"& lt; br/>> quot;// 换行< br />}
}
}
结果
0 20 0
4 11 5
8 2 10
2. Walk about 490 meters from Shenzhen Futian port to the entrance and exit of Lok Ma Chau Station, take the East Rail Line (Lok Ma Chau line) (13 stops) to the entrance and exit A1 of Hung Hom station, go to the Cross Harbour Tunnel Toll Plaza Station (Kangzhuang Road) on Kangzhuang Road, and then transfer to Citybus / KMB 102 (2 stops) New bus / KMB 106 (2 stops) to Victoria Park Station (Causeway Road). Walk about 50 meters to Hong Kong Victoria Park
3. Walk about 610 meters from Shenzhen Futian port to port brigade station, and take bus 235 (4 stops), 26 (4 stops), 362 (4 stops) No.367 (take 5 stops) to Huanggang port terminus, Shenzhen Huanggang port (through bus temporary stop) and transfer to coach: Shenzhen Huanggang port - Wangjiao Weijing Hotel, Hong Kong (take 2 stops) to Wangjiao Weijing Hotel, Hong Kong (take 2 stops), then go to Wangjiao Weijing Hotel Station (Lai Chi Kok Road) and transfer to Citybus R11 (take 11 stops) to Victoria Park Station (Causeway Road). Walk about 50 meters to Hong Kong Victoria Park
4. Walk about 590 meters from Shenzhen Futian port to Lok Ma Chau railway station, take KMB B1 (take 5 stops) to Yuen Long Youxin Street Station (No. 46 Castle Peak Road), go to Yuen Long Guting Street Station (new zone) across the road, and transfer to KMB 968 (take 15 stops) to Victoria Park Station (Causeway Road). Walk about 50 meters to Hong Kong - Victoria Park