XML : Remove all children nodes and get the content with simpleXML

I want to get the content of all children node in a one varable. For example :

  <p><distinct type="twitter-retweet"><ident>RT</ident>              <addressingTerm><addressMarker>@</addressMarker><addressee type="twitter-account"                  ref="https://twitter.com/LePG 35022597"              >LePG</addressee></addressingTerm>:</distinct> A 07h50,                <addressingTerm><addressMarker>@</addressMarker><addressee type="twitter-account"                ref="#cmr-politweets-p80820758">JLMelenchon</addressee></addressingTerm> est            l'invité des #4vérités sur <distinct type="twitter-hashtag"><ident>#</ident><rs                ref="https://twitter.com/search?q=%23France2&amp;src=hash"            >France2</rs></distinct>. Nous live-tweeterons. #Chômage <distinct              type="twitter-hashtag"><ident>#</ident><rs                ref="https://twitter.com/search?q=%23Municipales2014&amp;src=hash"                >Municipales2014</rs></distinct></p>    

I want to have in output this sentence : "RT @LePG A 07h50, @JLMelenchon est l'invité des #4vérités sur #France2. Nous live-tweeterons. #Chomage #Municipale2014" The problem is when i use asXML(), i have also the nodes in the variable.

Thanks