Contract call returnig different values from web3.php and web3.js

I'm calling isValidSignature method from wallet contract implementing EIP1271 (sort of, returning bool, for Argent [and Loopring] wallets, taken from spruceid/siwe/test/eip1271.json).

Problem is that the web3.php call is returning false; while the web3.js call is returning true as expected.

All the params are taken from the same json file, so they are exactly the same for both the implementations.

Here a test repo.

Code

In php I'm doing this (in a class extending PHPUnit\Framework\TestCase):

function testEip1271FromJson()
{
  $data = json_decode(file_get_contents("path/to/below.json"), true);
  extract($data);

  $web3 = new Web3(new HttpProvider(new HttpRequestManager($rpc, "2000")));
  $wallet_contract = new Contract($web3->provider, $abi);

  $wallet_contract->at($address)->call(
    'isValidSignature',
    $hashedMessage,
    $signature,
    function ($err, $result) {
      var_dump($err);     // NULL
      var_dump($result);  // array(1) { [0] => false(bool) }
      if($err != null) {
        return $this->fail($err->getMessage());
      }
      $this->assertTrue($result[0]); // line 272
    }
  );
}

resulting in:

 ✘ Eip 1771 from json
   │
   │ Failed asserting that false is true.
   │
   │ tests/MessageTest.php:272
   │ vendor/web3p/web3.php/src/Contract.php:667
   │ vendor/web3p/web3.php/src/Providers/HttpProvider.php:56
   │ vendor/web3p/web3.php/src/RequestManagers/HttpRequestManager.php:100
   │ vendor/web3p/web3.php/src/Providers/HttpProvider.php:62
   │ vendor/web3p/web3.php/src/Eth.php:105
   │ vendor/web3p/web3.php/src/Contract.php:668
   │ tests/MessageTest.php:273
   │
NULL
array(1) {
  [0]=>
  bool(false)
}

This is the (working) js:

import Web3 from "web3";

async function testValidSignature() {
  const data = require("path/to/below.json");
  const { rpc, abi, address, hashedMessage, signature } = data;

  const web3 = new Web3();
  web3.setProvider(rpc);
  const walletContract = new web3.eth.Contract(abi, address);

  const isValidSignature = await walletContract.methods.isValidSignature(
      hashedMessage,
      signature
  ).call();

  console.log(isValidSignature); // true
}

This is the json:

{
  "rpc": "https://main-rpc.linkpool.io/",
  "signature": "0x00193f8bb87a8bd4a8367a47ee477c62aec984830ec59e730b28d1ec54669eab450b9f3108a5c435648691c5766b35e2f13b8fb29f46298bb378ac34597d7e271c",
  "hashedMessage": "0x13f64d354be469f23cf911231c7acf0b0faf781fbdef0eb1c463bdec229faf0b",
  "address": "0xa5b3A53800cD49669F34DE80f2C569c6D4Ca3009",
  "abi": [
    {
      "inputs": [
        {
          "internalType": "bytes32",
          "name": "_message",
          "type": "bytes32"
        },
        {
          "internalType": "bytes",
          "name": "_signature",
          "type": "bytes"
        }
      ],
      "name": "isValidSignature",
      "outputs": [
        {
          "internalType": "bool",
          "name": "",
          "type": "bool"
        }
      ],
      "stateMutability": "view",
      "type": "function"
    }

}

web3p / web3.php

Contract call returnig different values from web3.php and web3.js #287

Code