How interact with smart contract using web3.php

[vnxz]

I try to interact with smart contract in laravel using web3.php.

$abi = "[{\"inputs\":[],\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"\",\"type\":\"address\"}],\"name\":\"balances\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]" ;
$contract = new Contract('http://localhost:8545', $abi);
//dd($contract);

$contractAddress = '0x4A789dE2fE1926A6428000c094Bc81a46F15e3E0';

$toaddress = '0xeE01EDe04D42e1a51C99f2737B9E14Fc930a1fd4';
$amount = 100 ;
    // call contract function
$contract->at($contractAddress)

         ->call('transfer', $toaddress, $amount , function ($err, $data) {
                if ($err !== null) {
                  throw new Exception($err->getMessage());
                }
                dd($data);
              });

   }

my contract is

 *Submitted for verification at BscScan.com on 2022-02-04
*/

// SPDX-License-Identifier: GPL-3.0

pragma solidity ^0.8.2;

contract Token {
    mapping(address => uint) public balances;
    mapping(address => mapping(address => uint)) public allowance;
    uint public totalSupply = 10000 * 10 ** 18;
    string public name = "My Token";
    string public symbol = "TKN";
    uint public decimals = 18;

    event Transfer(address indexed from, address indexed to, uint value);
    event Approval(address indexed owner, address indexed spender, uint value);

    constructor() {
        balances[msg.sender] = totalSupply;
    }

    function balanceOf(address owner) public view returns(uint) {
        return balances[owner];
    }

    function transfer(address to, uint value) public returns(bool) {
        require(balanceOf(msg.sender) >= value, 'balance too low');
        balances[to] += value;
        balances[msg.sender] -= value;
       emit Transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint value) public returns(bool) {
        require(balanceOf(from) >= value, 'balance too low');
        require(allowance[from][msg.sender] >= value, 'allowance too low');
        balances[to] += value;
        balances[from] -= value;
        emit Transfer(from, to, value);
        return true;   
    }

    function approve(address spender, uint value) public returns (bool) {
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        return true;   
    }
}

error is

cURL error 28: Failed to connect to localhost port 8545: Timed out (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for http://localhost:8545 

why this happen? plz someone help

[MariusMez]

It seems your contract is deployed to the BSC, so you need a provider on that blockchain.

localhost:8545 is a local address in cas you use a local node (hardhat, truffle, ganache, ...)

You need to use a provider uri for that blockchain (see: https://docs.binance.org/smart-chain/developer/create-wallet.html#connect-to-bsc-network)

Something like this to connect to the BSC mainnet :

$contract = new Contract('https://bsc-dataseed1.binance.org:443', $abi);

An other example for the BSC testnet and with a timeout for the provider (default is 1s and this is short sometimes):

$providerUri='https://data-seed-prebsc-1-s1.binance.org:8545';
$timeout = 30;
$provider = new HttpProvider(new HttpRequestManager($providerUri, $timeout));
$contract = new Contract($provider, $abi)

[vnxz]

It seems your contract is deployed to the BSC, so you need a provider on that blockchain.

localhost:8545 is a local address in cas you use a local node (hardhat, truffle, ganache, ...)

You need to use a provider uri for that blockchain (see: https://docs.binance.org/smart-chain/developer/create-wallet.html#connect-to-bsc-network)

Something like this to connect to the BSC mainnet :

$contract = new Contract('https://bsc-dataseed1.binance.org:443', $abi);

An other example for the BSC testnet and with a timeout for the provider (default is 1s and this is short sometimes):

$providerUri='https://data-seed-prebsc-1-s1.binance.org:8545';
$timeout = 30;
$provider = new HttpProvider(new HttpRequestManager($providerUri, $timeout));
$contract = new Contract($provider, $abi)

thanks bro, can you also show me process of sending token in web3.php. it need to sign in transaction first and then send token. cannot call directly transfer method . do you have some example for this . I try to send token on web3.php by laravel.

[MariusMez]

Please see my response here: https://github.com/web3p/web3.php/issues/251#issuecomment-1063884215

[banls]

Thinks