March 31, 2021

How to generate a new Ethereum address in PHP


PHP is very popular in developing the backend of websites or web applications. PHP has a huge crowd of developers trusting it as their go-to language. In this guide, we will see how we can generate a new Ethereum address in PHP.

  • PHP 7.0 or above installed with gmp extension.
  • Composer installed
  • A text editor
  • CLI

What is an Ethereum address?

While signing in to any platform on the internet, you need to authenticate using a combination of credentials. Consider an Ethereum address as your username and a corresponding private key as the password. While your Ethereum address is public and can be shared, the private key must always be kept secret. Using this combination lets you interact with the Ethereum blockchain. An Ethereum address is your identity on the blockchain, and it looks like this “0x6E0d01A76C3Cf4288372a29124A26D4353EE51BE”. Having a valid Ethereum address is required for:

  • Receiving/Sending Ethereum currency
  • Signing/Sending transactions
  • Connecting to decentralized applications

How an Ethereum address is generated:

A random private key of 64 (hex) characters (256 bits / 32 bytes) is generated first. For example:

A 128 (hex) character (64 bytes) public key is then derived from the generated private key using Elliptic Curve Digital Signature Algorithm (ECDSA). For example:

The Keccak-256 hash function is then applied to (128 characters / 64 bytes) the public key to obtain a 64 character (32 bytes) hash string. The last 40 characters / 20 bytes of this string prefixed with 0x become the final Ethereum address. For example:

Note: 0x in coding indicates that the number/string is written in hex.

What is PHP?

PHP is a recursive acronym for Hypertext Preprocessor; PHP is a widely used open-source server-side scripting language usually embedded in HTML. It is used to manage databases, session tracking, dynamic content; It works with almost all the popular databases like MySQL, PostgreSQL, MS SQL Server, etc. It has C language-like syntax and supports significant protocols like LDAP, IMAP, and POP3. PHP4 added support for Java and distributed object architectures (COM and CORBA), making n-tier development possible for the first time.

Everyday use cases of PHP

  • To set and access cookie variables.
  • To gather information from web forms.
  • To perform system functions like opening and closing files.
  • To add, delete, and modify elements in databases.
  • Adding user-based restrictions on webpages.

Following are some characteristics of PHP

  • Scalability
  • Flexibility
  • Simplicity
  • Case Sensitive
  • Loosely typed
  • Interpreted
  • Open Source

Installing PHP and other dependencies

Before installing the dependencies, which we require to generate an address, let’s check if we have PHP installed on our system. To do so, copy-paste and run the following in your terminal/cmd.

$ php -v

It should return the PHP version; if not installed, download the operating system-specific PHP following the instructions on the official PHP website’s download page.

We’ll need to install the PHP gmp extension; you can either uncomment it from the php.init file or install it manually using the following.

$ sudo apt-get install php-gmp

Note: We should enable gmp using only one of the methods mentioned above. 

For mac:
Reinstalling PHP with brew can help to enable the gmp extension, type the following commands:

$ brew reinstall php@7.2

$ export PATH="/usr/local/opt/php@7.2/bin:$PATH"

$ brew services restart php@7.2

$ php -info | grep "GMP"

We’ll use composer (A dependency manager for PHP) to manage PHP libraries/dependencies required to generate addresses and keys. Check if the composer is installed on your system or not by running the following in your terminal/cmd:

$ composer 

If not installed, download and install it by following the Composer website’s downloads page.

Now create a JSON file named composer.json in your project directory and copy-paste the following in it.

    "require": {
        "sop/asn1": "^3.3",
        "sop/crypto-encoding": "^0.2.0",
        "sop/crypto-types": "^0.2.1",
        "kornrunner/keccak": "^1.0",
        "symfony/dotenv": "^4.0",
        "sc0vu/web3.php": "dev-master"

Save the file and install the dependencies using composer:

$ composer install

This will install the required dependencies in the directory.

Generating an Ethereum address in PHP

Now make a new PHP file named Address.php in the directory and copy-paste the following in it.


require_once "vendor/autoload.php";

use Sop\CryptoTypes\Asymmetric\EC\ECPublicKey;
use Sop\CryptoTypes\Asymmetric\EC\ECPrivateKey;
use Sop\CryptoEncoding\PEM;
use kornrunner\Keccak;

$config = [
    'private_key_type' => OPENSSL_KEYTYPE_EC,
    'curve_name' => 'secp256k1'

$res = openssl_pkey_new($config);

if (!$res) {
    echo 'ERROR: Fail to generate private key. -> ' . openssl_error_string();

openssl_pkey_export($res, $priv_key);

$key_detail = openssl_pkey_get_details($res);
$pub_key = $key_detail["key"];

$priv_pem = PEM::fromString($priv_key);

$ec_priv_key = ECPrivateKey::fromPEM($priv_pem);

$ec_priv_seq = $ec_priv_key->toASN1();

$priv_key_hex = bin2hex($ec_priv_seq->at(1)->asOctetString()->string());
$priv_key_len = strlen($priv_key_hex) / 2;
$pub_key_hex = bin2hex($ec_priv_seq->at(3)->asTagged()->asExplicit()->asBitString()->string());
$pub_key_len = strlen($pub_key_hex) / 2;

$pub_key_hex_2 = substr($pub_key_hex, 2);
$pub_key_len_2 = strlen($pub_key_hex_2) / 2;

$hash = Keccak::hash(hex2bin($pub_key_hex_2), 256);

$wallet_address = '0x' . substr($hash, -40);
$wallet_private_key = '0x' . $priv_key_hex;

echo "\r\n   SAVE BUT DO NOT SHARE THIS (Private Key): " . $wallet_private_key;
echo "\r\n   Address: " . $wallet_address . " \n";

Explanation of the code above

Line 1: Starting the PHP script with PHP opening tag.

Line 3-8: Importing the installed dependencies.

Line 10-20: Using secp256k1 curve to generate the private key.

Line 22: Generating the private key.

Line 24-25: Getting the public key.

Line 29-31: Converting key to Elliptic Curve Private Key Format then converting it to ASN1 Structure.

Line 33-36: Getting Private and public key in hex format.

Line 38-39: Deriving the Ethereum Address from the public key, every public key always starts with 0x04,
removing the leading 0x04 to hash it correctly.

Line 41: Getting the address in hash format.

Line 43: Adding 0x prefix and getting last 40 characters of the address hash and storing it in wallet_address variable.

Line 44: Adding 0x prefix to the private key and storing it in wallet_private_key variable.

Line 46: Printing the private key with a warning.

Line 47: Printing the Ethereum address with the string “Address:”

Now save the file and run the script.

$ php Address.php

If everything works as planned, it should look like this.


Congratulations on generating your very own Ethereum address in PHP; you can use this to make fantastic decentralized wallets.

Subscribe to our newsletter for more articles and guides on Ethereum. If you have any feedback, feel free to reach out to us via Twitter. You can always chat with us on our Discord community server, featuring some of the coolest developers you’ll ever meet :)
Ready to try QuickNode? Start your 7-day free trial

Related articles 16

Mar 20, 2021 How to connect to Ethereum using .NET (Nethereum)

Dotnet or .NET is very popular for the development of desktop applications, most Windows desktop applications are built using .NET, and it also contributes largely to web application’s tech stack. In this guide, let’s see how we can connect to Ethereum using .NET and

Continue reading
Mar 20, 2021 How to fetch Ethereum event logs in Ruby

Ethereum log records are very useful to understand and keep track of smart contract events. In this guide, we are going to learn how to fetch ethereum event logs in Ruby using ethereum.rb ruby...

Continue reading
Mar 20, 2021 How to generate a new Ethereum address in Go

Golang is very popular among backend developers for building infrastructures and microservices. Go is a procedural programming language. Developed in 2007 by Robert Griesemer, Rob Pike, and Ken Thompson at Google, then launched in 2009 as...

Continue reading
Mar 20, 2021 How to generate a new Ethereum address in Python

Python is one of the most versatile programming languages out there with an abundance of use cases; We can build many applications with Python from client-side to back end. In this guide, we will cover creating an Ethereum address in Python using the

Continue reading
Mar 20, 2021 How to generate a new Ethereum address in JavaScript

When it comes to programming, there’s hardly anyone who has not used or heard about JavaScript. JavaScript was initially created for client-side scripting but has become a full-featured Object-Oriented...

Continue reading
Mar 20, 2021 How to connect to the Ethereum network using Ruby

Ruby has a huge fanbase. Ruby was developed by its creator with an intention to create a language people can have fun using. Ruby has been largely accepted by the developers all around the world since it’s launch, in fact, the biggest tech communities in many cities are...

Continue reading
Mar 20, 2021 How to connect to the Ethereum network using Python using

You can build Ethereum applications in different programming languages. In this article, we will connect to the Ethereum network using Python.PrerequisiteEthereum Node (We will use QuikNode’s free...

Continue reading
Mar 20, 2021 How to connect to Ethereum network with ethers.js

When someone thinks of developing a dApp the first tool that comes to their mind is web3.js which is pretty common because of its popularity in the community and wide use cases, dApp development has been consistently growing and there are a lot of developers who want to...

Continue reading
Mar 20, 2021 How to re-send a transaction with higher gas price using ethers.js

Sometimes, you submit a transaction on Ethereum without enough gas due to network congestion or too many pending transactions offering a higher gas price than you have offered on your transaction. If you have a high priority transaction but low gas, you could end up...

Continue reading
Mar 20, 2021 How to connect to Ethereum network with Web3.js

Libraries and frameworks make the development process a lot easier and faster. When it comes to Ethereum development, Web3.js is the go to library. That's because Web3.js is the official library, from the

Continue reading
Mar 20, 2021 How to use Subspace with QuikNode

In this guide, we'll understand a bit about reactive development and how to use Subspace with QuikNode.JavaScript is the programming language behind most of the internet apps and websites. JavaScript today has become one of the most used programming languages, and...

Continue reading
Mar 20, 2021 How to generate a new Ethereum address in Ruby

With high usage in web applications and straightforward syntax, Ruby is used by a vast number of people. This guide will cover creating an Ethereum address in Ruby using ruby-eth...

Continue reading
Mar 20, 2021 How to connect to Ethereum network using Java / Web3j

We can say that Java is one of the most versatile languages out there, and it continues to be relevant in today's time. Java is so popular because of its massive user base and use cases. In this guide/tutorial, we'll learn how to connect to the Ethereum Blockchain network...

Continue reading
Apr 13, 2021 How to Fork Ethereum Blockchain with Ganache.

Forking and running a local simulated Ethereum environment is essential if you want to work with DeFi or do Ethereum development in general. In this guide, we’ll cover how to fork Ethereum Blockchain with

Continue reading
Mar 20, 2021 Estimating gas price using pending transactions in Python

To send a transaction on the Ethereum network, you need to pay fees for including the transaction in a block as well as the computation necessary in the transaction; this fee is called gas. The transactions are accepted into the block based on the amount of gas they are...

Continue reading
Mar 20, 2021 How to connect to Ethereum network using Go

Go helps you make faster scalable backends and this guide will show you how to connect your backend to Ethereum (and make it even faster, more reliable, and globally accessible, all thanks to QuikNode’s global infrastructure). What is...

Continue reading