XMLからJSON形式への変換メモ(PHP) ref: http://qiita.com/pistatium@github/items/7cfcd4ccb91c6f4c43e9

file0.php

$obj = simplexml_load_string($xml);
$json = json_encode($obj);

file1.php

$obj = simplexml_load_string($xml, NULL, LIBXML_NOCDATA);
$json = json_encode($obj);

file2.xml

<items>
  <item>Hoge</item>
</items>

file3.xml

<items>
  <item>Hoge</item>
  <item>Fuga</item>
</items>

file4.txt

{"item":"Hoge"}

file5.txt

{"item":["Hoge","Fuga"]}