AtomParser::ns_to_prefix( $qname,  $attr = false )

Source

function ns_to_prefix($qname, $attr=false) {
    # split 'http://www.w3.org/1999/xhtml:div' into ('http','//www.w3.org/1999/xhtml','div')
    $components = explode(":", $qname);

    # grab the last one (e.g 'div')
    $name = array_pop($components);

    if(!empty($components)) {
        # re-join back the namespace component
        $ns = join(":",$components);
        foreach($this->ns_contexts as $context) {
            foreach($context as $mapping) {
                if($mapping[1] == $ns && strlen($mapping[0]) > 0) {
                    return array($mapping, "$mapping[0]:$name");
                }
            }
        }
    }

    if($attr) {
        return array(null, $name);
    } else {
        foreach($this->ns_contexts as $context) {
            foreach($context as $mapping) {
                if(strlen($mapping[0]) == 0) {
                    return array($mapping, $name);
                }
            }
        }
    }
}

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