How to modify the node values of a XML file located at server end using PHP

[vinooth]

I need to modify my xml node value like\[code\]<summary><data>125</data></summary>\[/code\]to\[code\]<summary><data>200</data></summary>\[/code\]I am using PHP 5.2. Although i am able to read the xml files, but i am not able to update it\[code\]$doc = new DOMDocument();$doc->load( 'summary.xml' );$data = http://stackoverflow.com/questions/10995156/$doc->getElementsByTagName("data" );$datavalue = http://stackoverflow.com/questions/10995156/$data ->item(0)->nodeValue;echo"$datavalue\n";\[/code\]How to modify this data node value?