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function customHeaderRegistry($name = null, $value = null, $tag = false)
{
    static  $data = [];

    if(is_null($name) AND is_null($value)){
            return $data;
        }else{
        if($tag){
            $data['tags'][$name] = $value;

        }else{
            $data[$name] = $value;

        }

    }

}


function createCustomHeader(array $header = [])
{
    customHeaderRegistry('boxstart', isset($header['boxstart']) ? $header['boxstart'] : '<newheader>');
    customHeaderRegistry('boxend', isset($header['boxend']) ? $header['boxend'] : '</newheader>');
    customHeaderRegistry('tags', isset($header['tags']) ? $header['tags'] : []);
    ob_start();
    
}


function setCustomHeader($tag, $value)
{
    customHeaderRegistry($tag, $value, true);

}


function replaceCustomHeader()
{
    $data = customHeaderRegistry();
    $html = ob_get_contents();
    ob_clean();
    foreach ($data['tags'] as $tag=>$value){
        $html = preg_replace('|(<[^>]+'.$tag.'.*?)content="([^"]+)|is', '\1 content="'.$value, $html);
        $html = preg_replace('|<'.$tag.'>([^<]+)|is', '<'.$tag.'>'.$value, $html);
    }

    ob_start();
    echo $html;
}