Array to String convertion

Hello guys,

Can anybody help me why I get this error?

Notice (8): Array to string conversion...

I try to explode a url, here is the code:
$var = $this->params["url"];
$res = explode("/", $var);

then
I debug the $res...

debug($res);

then I got those error...

can anyone help me?

thanks
randalle2
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