The examples haven't been updated in 5 years

[accountnujen]

The examples haven't been updated in 5 years. It's kind of impossible to create accounts anymore. At least in quicknode and infura you can't newAccount.

If I want to see the wallet balance, which query should I run?
Or if I want to send a transaction, what should I write?

[rhinogroup]

    $eth->getBalance($from_address, function ($err, $balance) use ($from_address) {
        if ($err !== null) {
            echo '<br>' . __LINE__ . ' -- Error: ' . $err->getMessage();
            return;
        }
        echo '<br>' . __LINE__ . ' -- From Address: ' . $from_address . ' Balance: ' . $balance . PHP_EOL;
    });

This will get you a balance according to the ../vendor/web3p/web3.php/examples/sendTransaction.php

Although I can't get the sendTransaction function to work, it does provide me the balances to both send and receive accounts.

I seem to remember reading somewhere that it is no longer possible to create a newAccount on the Ethereum blockchain. Deprecated? Not sure. I use the following code to create an account:

function create_eth_address(){
    $config = [
        'private_key_type' => OPENSSL_KEYTYPE_EC,
        'curve_name' => 'secp256k1'
    ];
    $res = openssl_pkey_new($config);

    if (!$res) {
        $error[__LINE__] = 'ERROR: Fail to generate private key. -> ' . openssl_error_string();
        // debug($error, "\nFILE: ".__FILE__." -- \nLINE: " . __LINE__. " -- error: ", "");
        exit;
    }

    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);

    $pubkey = '0x' . substr($hash, -40);
    $privkey = '0x' . $priv_key_hex;

   // Store your new pubkey and privkey here.
}

You can check your new address on any eth explorer