Laravel 8: Function params must be an array - php

Question

I have a route that must get some parameters:
Route::get('users/{function}/{param}/{feeLimit}/{callValue}/{bandwidthLimit}' , [TronController::class, 'totalUsers']);
And the method totalUsers looks like this:
public function totalUsers($function,$params,$feeLimit,$callValue,$bandwidthLimit){
And in the browser, I call it like this:
http://localhost:8000/users/totalUsers/array()/30000000/0/0
But now I get this error:
Function params must be an array
I know this way of adding parameters is wrong, but I don't how to call the url and variables like this on the browser:
$function="totalUsers";
$params=array();
$feeLimit=30000000;
$callValue = 0;
$bandwidthLimit = 0;
How can I call totalUsers method properly with its parameters?
Update 1
In the method totalUsers:
try {
$trigger = $TransactionBuilder->triggerSmartContract(
(array)$abi,
$contractH,
$function,
$params,
$feeLimit,
$addressH,
$callValue = 0,
$bandwidthLimit = 0);
var_dump($trigger);
} catch (\IEXBase\TronAPI\Exception\TronException $e) {
die($e->getMessage());
}

Answer 1

Easily You can solve this problem by using this route as post:
Route::post('/users' , [TronController::class, 'totalUsers'])->name('users');
Then you can send the value by submitting a form:
<form action="{{ route('users') }}" method="post">
#csrf
<input type="text" name="function" />
<input type="text" name="params[]" />
<input type="text" name="params[]" />
<input type="text" name="params[]" />
.... // how much you want
<input type="text" name="feeLimit" />
<input type="text" name="callValue" />
<input type="text" name="bandwidthLimit" />
<input type="submit" value="Send">
</form>
You will be getting an array for this params field, this is secure and you can send a large number of data character:
In the controller:
public function totalUsers(Request $request)
{
$function=$request->function;
$params=$request->param; // this will be an array
$feeLimit=$request->feeLimit;
$callValue = $request->callValue;
$bandwidthLimit = $request->bandwidthLimit;
foreach( $params as $param )
{
$param; // do what ever you want
}
}

Answer 2

Your error has nothing to do with routes, it's a tron-api's error. The triggerSmartContract() function expects $params to be an array, but you're passing a string.
Easy way to solve that would be just convert your $params string to array in the arguments (array)$params.
Correct way would be to follow advice in this answer, though I'd suggest to validate user input:
public function totalUsers(Request $request)
{
$request->validate([
'function' => 'required|string',
'params' => 'required|array',
'feeLimit' => 'required|numeric',
'callValue' => 'sometimes|numeric',
'bandwidthLimit' => 'sometimes|numeric',
]);
try {
$trigger = $TransactionBuilder->triggerSmartContract(
(array)$abi,
$contractH,
$request->input('function'),
$request->input('params'),
$request->input('feeLimit'),
$addressH,
$request->input('callValue', 0),
$request->input('bandwidthLimit', 0)
);
var_dump($trigger);
} catch (\IEXBase\TronAPI\Exception\TronException $e) {
die($e->getMessage());
}
}