Converting xml DOMDocument to HTML string and echo

Question

I have this Class

Class Parser extends DOMDocument {

    public function setHTML($file) {
        $this->loadHTMLFile($file);
    }

    public function setAttribute($name, $value) {
        return $this->setAttribute($name, $value);
    }

    public function findById($id) {
        return $this->getElementById($id);
    }

}

and I use it like this:

$parser = new Parser();
$parser->setHTML('as.html');
$parser->findById("xaxa")->setAttribute('name1', 'value1');

but if I have to see the changed HTML I call SAVEHTML like this

echo $parser->saveHTML();

Is there a way to make it automatic? Like when method setAttribute is called to make

$this->saveHTML()

auto so I will have this

$html =$parser->findById("xaxa")->setAttribute('name1', 'value1');

then call

echo $html;

Thanks alot

your function saveHTML() where is declared in wich class or file? — Hichem
– Hichem, Commented Nov 23, 2013 at 10:25
In your class you're already calling parent class's functions from with yours... — Damien Pirsy
– Damien Pirsy, Commented Nov 23, 2013 at 10:36
I know how it will work but i don't want it that way. Everytime i should make $html = $parser->saveHTML(); echo $html; and again and again i just want $parser->SaveHTML() to be called auto... thats all — xScence
– xScence, Commented Nov 23, 2013 at 10:47
if my solution fixes your problem, please accept it as as correct answer - so when others encounter your OP know how to solve the issue. — Gadoma
– Gadoma, Commented Nov 23, 2013 at 10:53

Gadoma · Accepted Answer · 2013-11-23 10:47:56Z

Well, the DOM object cannot be used (directly) as string, and when you'll try for example echo it will throw an exception

Catchable fatal error: Object of class DOMDocument could not be converted to string in ...

The saveHTML method is explicitly designed to return the nodes as HTML string - than you can echo it. Bear in mind, that actually the nodes are already updated (saved!) after you call the setAttribute method - the saveHTML is just for rendering a html string from the nodes.

Providing I understand your concept, and you still think you want it your way, maybe you can try the below solution - but just for the record, I didnt test the code.

Class Parser extends DOMDocument 
{

    public function setHTML($file) 
    {
    $this->loadHTMLFile($file);
    }

    public function setAttribute($name, $value) 
    {
        return $this->setAttribute($name, $value);
    }

    public function findById($id) 
    {
        return $this->getElementById($id);
    }

    public function __toString()
    {
        return $this->saveHTML(); 
    }
}

// and now this should work

$parser = new Parser();
$parser->setHTML('as.html');
$parser->findById("xaxa")->setAttribute('name1', 'value1');
echo $parser;

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