Avoid variables with short names like $c. Configured minimum length is 3.
Short variable names may make your code harder to understand. Variable names should
be self-descriptive. This check looks for variable names who are shorter than
a configured minimum.
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$renderer = new Renderer($config);
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return $renderer;
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};
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$container['mailRenderer'] = function (Container $c) use ($config) {
This check looks from parameters that have been defined for a function or method, but which are not used in the method body.