my normal function call is ok and gives me back what i want.

but with the call_user_func and also with the call_user_func_array,
I experimented a lot and always give me back an wrong result.

Sorry but iam noobie

so the normal function call :

$key = ("msg_exists");
ArrayNoKeyMessage ($key,$GetJsonArray);

gives me back :
the message exists

but if i want to call call_user_func

$key = ("foo");
call_user_func('ArrayNoKeyMessage',$key,array('$GetJsonArray')) ;

give me always back
the message dont exists

it seams that call_user_func can not read succesfully $GetJsonArray ?

here the whole code example

<?php
$GetJsonArray = [
    "foo" => "bar",
    "bar" => "foo",
    "msg_exists" => "the message exists",
   
   
];

function ArrayNoKeyMessage($key,$GetJsonArray)
{
    if (!array_key_exists($key, $GetJsonArray)) {
      echo 'the message dont exists';
    } else {
        echo $GetJsonArray["$key"].PHP_EOL."";
    }
}

$key = ("msg_exists");
ArrayNoKeyMessage ($key,$GetJsonArray);

$key = ("foo");
call_user_func('ArrayNoKeyMessage',$key,array('$GetJsonArray')) ;