WWW to non-WWW Redirect with PHP

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Try this:

if (substr($_SERVER['HTTP_HOST'], 0, 4) === 'www.') {
    header('Location: http'.(isset($_SERVER['HTTPS']) && $_SERVER['HTTPS']=='on' ? 's':'').'://' . substr($_SERVER['HTTP_HOST'], 4).$_SERVER['REQUEST_URI']);
    exit;
}

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