Generating XML document in PHP (escape characters)

Question

I\'m generating an XML document from a PHP script and I need to escape the XML special characters. I know the list of characters that should be escaped; but what is the corr

Answer 1

 function replace_char($arr1)
 {
  $arr[]=preg_replace('>','>', $arr1); 
  $arr[]=preg_replace('<','<', $arr1);
  $arr[]=preg_replace('"','"', $arr1);
  $arr[]=preg_replace('\'','&apos', $arr1);
  $arr[]=preg_replace('&','&', $arr1);

  return $arr;
  }