Laravel passing variable to wherehas query

To pass a variable to closure you have to use the use() function

$products = Product::whereHas('natures', function($q) use($catname)        {            $q->where('nature_slug', '=', $catname);        });

php laravel laravel-query-builder

If you want provide string in variable, use this code

$catname = 'abc';

or declare abc constant

const abc = 123;

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