copy xml data using php

[kows]

That's the code i am using

if( !in_array( $_POST['cid'], $existing_courses)){ 
copy_course($FILE_LIB_XML, $FILE_ARCHIVE_XML, $FILE_USERS_XML, $cid );

And here is how i used your code to replace the above

$existing_courses = get_infos($FILE_ARCHIVE_XML, $cid); 
if(!$existing_courses) 
  echo 'there was no data in that xml file'; 
else{ 
copy_course($FILE_LIB_XML, $FILE_ARCHIVE_XML, $FILE_USERS_XML, $cid );}

I can not understant why the archive.xml is being updaded and still the php returns the warning which disapears when i refresh the page

Thanks

no, you're doing that wrong. you are supposed to be using is_array inside your function and not calling foreach() if the $cnt variable is NOT an array. your function should be structured like this (of course, the "blah"s are simply filler that you must replace real code with -- this just gives you the general idea):

function get_infos($xml, $id){ //<-- start function
  //blah blah
  $cnt = $child->childNodes;
  if(is_array($cnt)){ //<-- this was added
    foreach($cnt as $cn){
      //blah blah blah
    }
    return $mtd;
  }else //<-- this and the line below were also added
    return false;
} //<-- end function 

then, when you are calling get_infos(), you can use the code in my first post to see if the XML file had any information in it.

$courses = getinfos($archive_xml, $id);
if(!$courses)
  echo 'no data was found in the xml file';
else
  copy_course($lib_xml, $archive_xml, $users_xml, $id);