php - check if the file exists, if not, create -

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How do I use php dom, if an XML file exists, and it is not created. 

   AppendChild ($ newText); $ Xmldoc- & gt; Save ('sample.xml'); ? & Gt;

Right now, because it does not exist, it gives me this error: 

  DOMDocument :: load (): I / O Warning: Failed External To load the unit  
 
 Do not do this with the DOM, check it yourself: 
 
  If (file_exists ('sample.xml')) {$ xmldoc- & gt; Load ('sample.xml'); } And ($ xmldoc-> loadXML ('& lt; root / & gt;'); // or any other Routot name that attacks your fancy}  
 
 file For savings will automatically be  $ xmldoc-> Save ();  with the next.

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