PHP Error: Function name must be a string

This error typically occurs when you are trying to call a function, but you are not passing a string as the name of the function.

Here is an example of code that would trigger this error:

<?php

$functionName = 'myFunction';
$functionName();

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To fix this error, make sure that you are passing a string as the name of the function when you call it. You can do this by enclosing the name of the function in quotes, like this:

<?php

$functionName = 'myFunction';
call_user_func($functionName);

Alternatively, you can simply call the function directly by using its name as a string, like this:

<?php

myFunction();