Delete white spaces in content

I want to compress the output of the entire HTML code

I have simple function

public function sanitize_output($buffer) {

    $search = array(

        '/\>[^\S ]+/s',  // strip whitespaces after tags, except space

        '/[^\S ]+\</s',  // strip whitespaces before tags, except space

        '/(\s)+/s'       // shorten multiple whitespace sequences

    );

    $replace = array(

        '>',

        '<',

        '\\1'

    );

    $buffer = preg_replace($search, $replace, $buffer);

    return $buffer;

}

I found that the output of all content located in renderLayout.

How can I override and before displaying content use my function? Or is there still what that means for compression of the whole page? 

Thank you very much!

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