How can I remove attributes from an html tag?

Question

How can I use php to strip all/any attributes from a tag, say a paragraph tag?

to

Answer 1

Strip attributes using SimpleXML (Standard in PHP5)

';
// define allowable attributes
$allowable_atts = array('href','src','alt');

// strip collector
$strip_arr = array();

// load XHTML with SimpleXML
$data_sxml = simplexml_load_string(''. $data_str .'', 'SimpleXMLElement', LIBXML_NOERROR | LIBXML_NOXMLDECL);

if ($data_sxml ) {
    // loop all elements with an attribute
    foreach ($data_sxml->xpath('descendant::*[@*]') as $tag) {
        // loop attributes
        foreach ($tag->attributes() as $name=>$value) {
            // check for allowable attributes
            if (!in_array($name, $allowable_atts)) {
                // set attribute value to empty string
                $tag->attributes()->$name = '';
                // collect attribute patterns to be stripped
                $strip_arr[$name] = '/ '. $name .'=""/';
            }
        }
    }
}

// strip unallowed attributes and root tag
$data_str = strip_tags(preg_replace($strip_arr,array(''),$data_sxml->asXML()), $allowable_tags);

?>

    

             

                                                        
            
            

              
                
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