Compile Error: Cannot use isset() on the result of an expression

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From documentation:

isset() only works with variables as passing anything else will result in a parse error.

You’re not directly passing a variable to isset(). So you need to calculate the value first, assign it to a variable, and then pass that to isset().

For example, what you’re doing at the moment is something like:

if(isset($something === false)) { } // throws a parse error, because $something === false is not a variable

What you need to do instead is:

$something = false;
if(isset($something)) { ... }

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