Edit XML with php script

In an xml file I have this structure (with <post>repeating) : <data> <post> <deal_id>479</deal_id> <deal_title><![CDATA[Δίπλωμα Μηχανής, στη Σχολή Οδηγών Παραστατίδης στον Εύοσμο, μόνο με 49€]]></deal_title> <deal_url>[login to view URL]</deal_url> <deal_city><![CDATA[Θεσσαλονίκη]]></deal_city> <deal_price><![CDATA[49]]></deal_price> <deal_previous_price><![CDATA[125]]></deal_previous_price> <deal_discount><![CDATA[60.8]]></deal_discount> <deal_start><![CDATA[2016-01-10 00:00:00]]></deal_start> <deal_end><![CDATA[2016-04-01 00:00:00]]></deal_end> <deal_image> <image> <file>[login to view URL]</file> <title>c700x420</title> <caption></caption> <description></description> <alt></alt> </image> <image> <file>[login to view URL]</file> <title>diploma1</title> <caption></caption> <description></description> <alt></alt> </image> </deal_image> <deal_sales><![CDATA[0]]></deal_sales> <deal_active><![CDATA[true]]></deal_active></post></data> and I would like to transform the <deal_image> to <deal_image>[login to view URL]</deal_image> which means keep only the first appearing jpg and discard the rest..and do that for all <post> Can you do that with php? So the desired output would be something like this: <data> <post> <deal_id>479</deal_id> <deal_title><![CDATA[Δίπλωμα Μηχανής, στη Σχολή Οδηγών Παραστατίδης στον Εύοσμο, μόνο με 49€]]></deal_title> <deal_url>[login to view URL]</deal_url> <deal_city><![CDATA[Θεσσαλονίκη]]></deal_city> <deal_price><![CDATA[49]]></deal_price> <deal_previous_price><![CDATA[125]]></deal_previous_price> <deal_discount><![CDATA[60.8]]></deal_discount> <deal_start><![CDATA[2016-01-10 00:00:00]]></deal_start> <deal_end><![CDATA[2016-04-01 00:00:00]]></deal_end> <deal_image>[login to view URL]</deal_image> <deal_sales><![CDATA[0]]></deal_sales> <deal_active><![CDATA[true]]></deal_active></post></data> Note that the deal_image tag kept only the url of the first image and ignored the rest. In my xml file there are lots of <post></post> sections, which should also be processed in an iteration.