php也可以调用web3相关接口进行转账交易，唯一需要注册的就是 https://developer.metamask.io/ 开发者网站 ，获得一个密钥，然后就可以调用了，首先：
composer require web3p/web3.php:0.2.1 composer require blockchainethdev/ethereum-tx
获取免费RPC地址的方法
通过MetaMask开发者网站注册 访问 MetaMask开发者网站，可以注册并获取免费的RPC地址。该网站提供了与MetaMask钱包集成的详细文档和资源，包括RPC配置信息。
使用Chainlist查找免费RPC 访问 Chainlist，搜索目标网络（如Ethereum Mainnet）。Chainlist会列出多个可用的免费RPC URL，用户可以根据需求选择合适的节点。
验证RPC可用性 在选择RPC URL后，建议测试其响应速度和稳定性。可以通过简单的API调用或钱包连接测试，确保节点可用。
配置钱包使用RPC 将获取的RPC URL配置到钱包（如MetaMask）中。通常需要输入链ID、网络名称和符号信息，具体参数可在Chainlist或MetaMask文档中找到。
注意事项 部分免费RPC可能有请求限制或延迟问题。对于高频使用的场景，建议选择多个备用节点或考虑付费服务以提高可靠性。
下面示例在php 7.3.33版本运行正常测试通过，其他版本请自行测试是否能用。
下面是一些简单的示例：
<?php
require('vendor/autoload.php');
use Web3\Web3;
use Web3\Contract;
use Web3\Providers\HttpProvider;
use Web3\RequestManagers\HttpRequestManager;
use Blockchainethdev\EthereumTx\Transaction;
define('your_private_key','96991d589fe5fbb2decd399c01d8912d05e1b82ab037472ec46a5f61840dfb91');
define('your_wallet_address','0x9411B02906FE57C8E7f8597F888AA358aDC7a410');
define('chainId',1);
/*
* 其他网络的chainId如下：
* Ethereum Mainnet : 1
* BNB Smart Chain Mainnet : 56
* Arbitrum One : 42161
* Polygon Mainnet : 137
* OP Mainnet : 10
*
* 可以去 https://chainlist.org/zh 查看其他网络id
*/
//在 https://infura.io 注册获得免费的rpc地址，也可以去 https://chainlist.org/zh
// 找到对应的网络比如 Ethereum Mainnet 然后可以找到很多免费的RPC URL
$Web3 = new Web3(new HttpProvider(new HttpRequestManager("https://mainnet.infura.io/v3/{密钥}")));
define('usdt_address','0xdAC17F958D2ee523a2206206994597C13D831ec7');
define('wbtc_address','0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599');
define('erc20_abi','[{"constant":false,"inputs":[{"name":"_spender","type":"address"},{"name":"_value","type":"uint256"}],"name":"approve","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transfer","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"_from","type":"address"},{"name":"_to","type":"address"},{"name":"_value","type":"uint256"}],"name":"transferFrom","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_owner","type":"address"},{"name":"_spender","type":"address"}],"name":"allowance","outputs":[{"name":"remaining","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"who","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"}]');
$Eth = $Web3->getEth();
function get_eth_balance($owner_address){
/*
获取指定账户的eth余额
owner_address: 指定账户地址
:return:账户余额
*/
global $Eth;
$Eth->getBalance($owner_address, function ($err, $balance) {
if ($err !== null) {
}
echo 'Balance: ' . $balance->toString() . PHP_EOL;
});
}
function get_erc20_balance($erc20_address, $owner_address){
/*
获取指定账户的erc20代币余额
erc20_address：erc20合约地址
owner_address： 指定账户地址
:return:账户erc20代币余额
*/
global $Web3;
$contract = new Contract($Web3->getProvider(), erc20_abi);
$contract->at($erc20_address)->call("balanceOf", $owner_address, function ($err, $balance) {
if ($err !== null) {
}
echo 'Balance: ' . $balance[0]->toString() . PHP_EOL;
});
}
function transfer_eth($to_address, $amount){
/*
发送指定数量的eth给指定地址
to_address：接收方地址
amount：发送eth数量
*/
global $Eth;
$Eth->getTransactionCount(your_wallet_address, function ($err, $transactionCount)use($to_address,$Eth,$amount) {
if ($err !== null) {
return print_r($err);
}
$Eth->gasPrice(function ($err, $gasPrice)use($transactionCount,$to_address,$Eth,$amount) {
if ($err !== null) {
return print_r($err);
}
$nonce = $transactionCount->toString();
$transaction = new Transaction([
'nonce' => intval($nonce),
'from' => your_wallet_address,
'to' => $to_address,
'gas' => 21000,
'gasPrice' => intval($gasPrice->toString()),
'value' => $amount,
'chainId' => chainId, // optional
]);
$sign_data = $transaction->sign(your_private_key);
$Eth->sendRawTransaction("0x".$sign_data, function ($err, $transaction) {
print_r([$err,$transaction]);
if ($err !== null) {
print_r($err);
}
echo 'tx id: ' . $transaction . PHP_EOL;
});
});
});
}
function contract_call($from_address,$contract_address,$callData){
global $Eth;
$transaction_dict =[
'from' => $from_address,
'to' => $contract_address,
'data' => $callData
];
$Eth->getTransactionCount(your_wallet_address, function ($err, $transactionCount)use($contract_address,$callData,$Eth,$transaction_dict) {
if ($err !== null) {
//print_r($err);
}
$nonce = $transactionCount->toString();
$transaction_dict['nonce'] = intval($nonce);
$Eth->gasPrice(function ($err, $gasPrice)use($nonce,$contract_address,$callData,$Eth,$transaction_dict) {
$Eth->estimateGas($transaction_dict, function ($err, $gas)use($gasPrice,$Eth,$transaction_dict) {
if ($err !== null) {
//print_r($err);
exit(1);
}
$transaction_dict['gasPrice'] =intval($gasPrice->toString());
$transaction_dict["gas"] = intval($gas->toString());
$transaction_dict["chainId"] = chainId;
$transaction = new Transaction($transaction_dict);
$sign_data = $transaction->sign(your_private_key);
$Eth->sendRawTransaction("0x".$sign_data, function ($err, $transaction) {
if ($err !== null) {
//print_r($err);
exit(1);
}
echo 'tx id: ' . $transaction . PHP_EOL;
});
});
});
});
}
function transfer_erc20($erc20_address, $to_address, $amount){
/*
发送erc20代币给指定地址指定数量
erc20_address：erc20代币合约地址
to_address：接收方地址
amount：发送erc20代币数量
*/
global $Web3;
$contract = new Contract($Web3->getProvider(), erc20_abi);
$callData = $contract->getData("transfer",$to_address , $amount);
contract_call(your_wallet_address,$erc20_address,"0x".$callData);
}
function approve($erc20_address, $approve_contract_address, $approve_amount){
/*
授权给指定地址指定数量的消费额度
erc20_address： erc20代币地址
approve_contract_address：指定的其他消费代币的合约地址
approve_amount：授权数量
*/
global $Web3;
$contract = new Contract($Web3->getProvider(), erc20_abi);
$callData = $contract->getData("approve",$approve_contract_address , $approve_amount);
contract_call(your_wallet_address,$erc20_address,"0x".$callData);
}
//# 获取账户eth余额
get_eth_balance(your_wallet_address);
//# 获取账户usdt余额
get_erc20_balance(usdt_address,your_wallet_address);
//# 发送1个以太坊给 0x95341E8d48ebCF212e0Eb8a314244Ba0cdFC85B5
transfer_eth("0x95341E8d48ebCF212e0Eb8a314244Ba0cdFC85B5",1*pow(10,16));
//# 发送1usdt 给 0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707
transfer_erc20(usdt_address,"0x50431c70f6B4B9ab5CA438Cb9a3f030C4Bad5707",1*pow(10,6));
//# 给 0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45 授权 10btc的消费额度
approve(wbtc_address,"0x68b3465833fb72A70ecDF485E0e4C7bD8665Fc45",10*pow(10,8));