... 3.0.8 - 3.0.18 only, PHP 4 >= 4.0.0) xml_parse_into_struct -- Parse XML data into an array structure . ... php class AminoAcid { var $ name ; // aa name var $ symbol ; // three letter symbol var $ code ; // one letter code var $ type ; // hydrophobic, charged or neutral function AminoAcid ($aa) { foreach ($aa as $k= $v) $this- $k = $aa[$k]; } } function readDatabase($filename) { // read the xml database of aminoacids $data = implode( ,file($filename)); $parser = xml _parser_create(...