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This issue is simple, but I am not sure what is the best approach to get around it.
If the variable contains a number, how can I make sure that the if statement only returns true if indeed the $some_var is one?
PHP is a loosely typed language which means values can change their type depends on the context. When a loose comparison is used, 1 is treated equal to true, as well as any non-empty string.
you need to use 3 equals if you want to compare taking into account the variable type.
here is more info http://php.net/manual/en/language.operators.comparison.php