how can i allow attributes like font-weight ?

function checkEntry($string)
{
	require_once '../htmlpurifier/library/HTMLPurifier.auto.php';
    
	$config = HTMLPurifier_Config::createDefault(); 
	$config->set('HTML', 'TidyLevel', 'none');
	$config->set('HTML', 'AllowedElements', 'font,u,strong,a,img,p,br,span');
	$config->set('HTML', 'AllowedAttributes', 'font.font-weight');

    //$purifier = new HTMLPurifier();
	$purifier = new HTMLPurifier($config);
    $string = $purifier->purify($string);
	
 	return $string;
}

Font-weight is not an attribute; it is a CSS property. Change AllowedAttributes to *.style

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