PHP mysqli query error but query is correct

Question

I have a MySQL Query which executes correctly in SequelPro but doesnt execute in PHP Mysqli. The message which is shown:

Execution stopped. Message: An

Answer 1

The error is pretty obvious.

What you have here is not an SQL query, but a set of multiple queries.
Whereas mysqli_query is intended to run only one query.

Therefore you should make two calls,

$this->connectionTargetDB->query("SET @csum := 0");
return $this->connectionTargetDB->query($toBoExecuted);