Converting XML Into a PHP Data Structure - The Completed XMLToArray Class (Page 7 of 9 )
class XMLToArray
{
//-----------------------------------------
// private variables
var $parser;
var $node_stack = array();
//-----------------------------------------
/** PUBLIC
* If a string is passed in, parse it right away.
*/
function XMLToArray($xmlstring="") {
if ($xmlstring) return($this->parse($xmlstring));
return(true);
}
//-----------------------------------------
/** PUBLIC
* Parse a text string containing valid XML into a multidimensional array
* located at rootnode.
*/
function parse($xmlstring="") {
// set up a new XML parser to do all the work for us
$this->parser = xml_parser_create();
xml_set_object($this->parser, $this);
xml_parser_set_option($this->parser, XML_OPTION_CASE_FOLDING, false);
xml_set_element_handler($this->parser, "startElement", "endElement");
xml_set_character_data_handler($this->parser, "characterData");
// Build a Root node and initialize the node_stack...
$this->node_stack = array();
$this->startElement(null, "root", array());
// parse the data and free the parser...
xml_parse($this->parser, $xmlstring);
xml_parser_free($this->parser);
// recover the root node from the node stack
$rnode = array_pop($this->node_stack);
// return the root node...
return($rnode);
}
//-----------------------------------------
/** PROTECTED
* Start a new Element. This means we push the new element onto the stack
* and reset it's properties.
*/
function startElement($parser, $name, $attrs)
{
// create a new node...
$node = array();
$node["_NAME"] = $name;
foreach ($attrs as $key => $value) {
$node[$key] = $value;
}
$node["_DATA"] = "";
$node["_ELEMENTS"] = array();
// add the new node to the end of the node stack
array_push($this->node_stack, $node);
}
//-----------------------------------------
/** PROTECTED
* End an element. This is done by popping the last element from the
* stack and adding it to the previous element on the stack.
*/
function endElement($parser, $name) {
// pop this element off the node stack
$node = array_pop($this->node_stack);
$node["_DATA"] = trim($node["_DATA"]);
// and add it an an element of the last node in the stack...
$lastnode = count($this->node_stack);
array_push($this->node_stack[$lastnode-1]["_ELEMENTS"], $node);
}
//-----------------------------------------
/** PROTECTED
* Collect the data onto the end of the current chars.
*/
function characterData($parser, $data) {
// add this data to the last node in the stack...
$lastnode = count($this->node_stack);
$this->node_stack[$lastnode-1]["_DATA"] .= $data;
}
//-----------------------------------------
}
Next: How to Use the Class >>
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