global on Function

[robbieyannor13]

Since I enabled FrankenPHP worker mode, all global variables within functions have stopped working. For example:

function conn($params) {
  global $conn;
  // ... ;
}

What is the solution without adding the connection as a parameter to conn($conn, $params)? As it would be very difficult to change everything.

[henderkes]

(Un-?)fortunately worker mode does require a few changes to your code. I wasn't aware global variables were a problem, though. Do they already fail on the very first request? It's possible that the variable is overwritten somewhere and then the next request won't have it initialised.

[robbieyannor13]

(Un-?)fortunately worker mode does require a few changes to your code. I wasn't aware global variables were a problem, though. Do they already fail on the very first request? It's possible that the variable is overwritten somewhere and then the next request won't have it initialised.

I tried creating a simple line of code like this to confirm my intended purpose.

$mysqli = new mysqli('mysqli', 'root', 'pass', 'db');

function row($table){   
    global $mysqli;
    $result=mysqli_query($mysqli,"SELECT `id` FROM `$table`;");
    return mysqli_num_rows($result);
}

echo row('users');

The result will display the following error message: Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /index.php

However, if I change it like this, the function will work.

function row($mysqli,$table){   
    $result=mysqli_query($mysqli,"SELECT `id` FROM `$table`;");
    return mysqli_num_rows($result);
}

echo row($mysqli,'users');

[withinboredom]

If you disable opcache, does it work? I'm chasing down a fun bug with opcache.

Also, did you check that $mysqli actually has a value?

[robbieyannor13]

If you disable opcache, does it work? I'm chasing down a fun bug with opcache.

Also, did you check that $mysqli actually has a value?

I have tried to disable OPcache, but it's still the same.

$test = 'abc';
function test(){
  var_dump($test);
}
test();

its given NULL

I found a temporary alternative that works.

$GLOBALS['test']='abc';
function test(){
  var_dump($GLOBALS['test']);
}
test();

[AlliBalliBaba]

The issue might be that the variable is not in global scope when you declare it, you can also do something like this:

function conn($params) {
  global $conn;
  if (!isset($conn)){
    $conn = ...
  }
  return $conn;
}