appending to XML file before closing tag

This works pretty well to append content to an XML file. However, I need to keep the closing tag where it belongs: at the end of the file. This only appends to the end and doesn't work. I use ... $myecho = "Hello World"; $file_name = "file.xml"; $file_pointer = fopen($file_name, "a"); fwrite($file_pointer, $myecho); fclose($file_pointer); I know I need to introduce: fread() and fseek(). but not sure how to put it all together. Anyone? -- Bill Amsterdam, NL