Replace multiple newlines, tabs, and spaces

Question

I want to replace multiple newline characters with one newline character, and multiple spaces with a single space.

I tried preg_replace(\"/\\n\\n+/\", \"\\n\",

Answer 1

I have dealt with strip_tags function in PHP and had some problems like: after having a linebreak then appear a new line with some spaces and then a new linebreak appear continuously ...etc. without any rule :(.

This is my solution for dealing with strip_tags

Replace multiple spaces to one, multiple linebreaks to single linebreak

function cleanHtml($html)
{
    // Clean code into script tags
    $html = preg_replace('#(.*?)#is', '', $html);

    // Clean code into style tags
    $html = preg_replace('/<\s*style.+?<\s*\/\s*style.*?>/si', '', $html );

    // Strip HTML
    $string = trim(strip_tags($html));

    // Replace multiple spaces on each line (keep linebreaks) with single space
    $string = preg_replace("/[[:blank:]]+/", " ", $string); // (*)

    // Replace multiple spaces of all positions (deal with linebreaks) with single linebreak
    $string = preg_replace('/\s{2,}/', "\n", $string); // (**)
    return $string;
}

Keywords are (*) and (**).