file_put_contents is not overwrite / overwrite context option not specified

I heard that file_put_contents overwrite the file if it exist ? That's what i want but it doesn't work. What do?

  $contentsAnnonces = file_get_contents("http://website1.fr/file.xml");
  $filename = "http://website2.fr/file.xml";
  file_put_contents($filename, $contentsAnnonces);

Error :

Remote file already exists and overwrite context option not specified

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