Php xml Parser

************************************************************************
Example:
************************************************************************
 
 
$xml = new XML('artikel.xml'); 
$xml->print_nodes(); 
 
?>    
 
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Script
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<?php 
 
# This script formats a xml file according to some rules. These rules 
# are processed in the function that xml_set_character_data_handler 
# defines. We have to remember, in which element we are, and furthermore, 
# which ancestor elements the current element has. 
 
class Node { 
    var $name; 
    var $attributes; 
    var $ancestors = "/" 
    var $data; 
    var $type; 
 
    function Node($tree) { 
        $this->name = array_pop($tree); 
        $this->ancestors .= implode("/", $tree); 
    } 
 
    function add_data($value) { 
        $this->data .= ' '.$value; 
    } 
 
    function get_type() { 
        if (strlen($this->data) > 0) { 
            return "with CDATA" 
        } else { 
            return "without CDATA" 
        } 
    } 
 
    function level() { 
        if ($this->ancestors == "/") return 0; 
      if (preg_match_all("/(\/{1})/", $this->ancestors, $result,PREG_PATTERN_ORDER)) { 
        return (count($result[0])); 
      } else { 
        return 0; 
        } 
    } 
 
    function has_attributes() { 
        return (is_array($this->attributes)); 
    } 
 
    function print_name() { 
        return "$this->name"; 
    } 
 
    function is_child($node) { 
        $result = preg_match("/^$ancestors/", $node->ancestors, $match); 
        if ($node->ancestors == $this->ancestors) $result = false; 
        return $result; 
    } 
} 
 
class XML { 
    var $file; 
    var $tree = array(); 
    var $nodes = array(); 
    var $PIs; 
    var $format_body = "font-family:Verdana;font-size:10pt;" 
    var $format_bracket = "color:blue;" 
    var $format_element = "font-family:Verdana;font-weight:bold;font-size:10pt;" 
    var $format_attribute = "font-family:Courier;font-size:10pt;" 
    var $format_data = "font-size:12pt;" 
    var $format_attribute_name = "color:#444444;" 
    var $format_attribute_value = "font-family:Courier;font-size:10pt;color:red;" 
    var $format_blanks = "   " 
 
    function XML($filename) { 
        $this->file = $filename; 
        $xml_parser = xml_parser_create(); 
        xml_set_object($xml_parser,&$this); 
        xml_set_element_handler($xml_parser, "startElement", "endElement"); 
        xml_set_character_data_handler($xml_parser, "characterData"); 
        xml_set_processing_instruction_handler ($xml_parser, "process_instruction"); 
                # Why should one want to use case-folding with XML? XML is case-sensitiv, I think this is nonsense 
        xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, false); 
 
        if (!($fp = @fopen($this->file, "r"))) { 
            die(print("Couldn't open file: $this->file\n")); 
        } 
 
        while ($data = fread($fp, 4096)) { 
          if (!xml_parse($xml_parser, $data, feof($fp))) { 
            die(sprintf("XML error: %s at line %d\n", 
              xml_error_string(xml_get_error_code($xml_parser)), 
              xml_get_current_line_number($xml_parser))); 
          } 
        } 
    } 
 
    function startElement($parser, $name, $attribs) { 
        # Adding the additional element to the tree, including attributes 
        $this->tree[] = $name; 
 
        $node = new Node($this->tree); 
        while (list($k, $v) = each($attribs)) { 
            $node->attributes[$k] = $v; 
      } 
        $this->nodes[] = $node; 
    } 
 
    function endElement($parser, $name) { 
        # Adding a new element, describing the end of the tag 
        # But only, if the Tag has CDATA in it! 
 
        # Check 
        if (count($this->nodes) >= 1) { 
            $prev_node = $this->nodes[count($this->nodes)-1]; 
            if (strlen($prev_node->data) > 0 || $prev_node->name != $name) { 
                $this->tree[count($this->tree)-1] = "/".$this->tree[count($this->tree)-1]; 
                $this->nodes[] = new Node($this->tree, NULL); 
            } else { 
                # Adding a slash to the end of the prev_node 
                $prev_node->name = $prev_node->name."/" 
                $this->nodes[count($this->nodes)-1]->name = $this->nodes[count($this->nodes)-1]->name."/" 
            } 
        } 
 
        # Removing the element from the tree 
        array_pop($this->tree); 
    } 
 
    function characterData($parser, $data) { 
        $data = ltrim($data); 
        if ($data != "") $this->nodes[count($this->nodes)-1]->add_data($data); 
    } 
 
    function process_instruction($parser, $target, $data) { 
        if (preg_match("/xml:stylesheet/", $target, $match) && preg_match("/type=\"text\/xsl\"/", $data, $match)) { 
            preg_match("/href=\"(.+)\"/i", $data, $this->PIs); 
#            print "<b>found xls pi: $PIs[1]</b><br>\n" 
        } 
    } 
 
    function print_nodes() { 
        # Printing the header 
        print "<html><head><title>".$this->nodes[0]->name."</title></head>" 
        print "<body style=\"".$this->format_body."\">\n" 
 
        # Printing the XML  Data 
        for ($i = 0; $i < count($this->nodes); $i++) { 
            $node = $this->nodes[$i]; 
 
            # Checking: Empty element 
            if ($node->name[strlen($node->name)-1] == "/") { 
                $end_char = "/" 
                $node->name = substr($node->name, 0, strlen($node->name)-1); 
            } else { 
                $end_char = "" 
            } 
 
            # Writing whitespaces, but only if it's _no_ closing element that follows 
            # directly on it's opening element 
            if (!("/".$this->nodes[$i-1]->name == $node->name)) { 
                for ($j = 0; $j < $node->level(); $j++) echo $this->format_blanks; 
            } 
            echo "<span style=\"".$this->format_bracket."\"><</span><span style=\"".$this->format_element."\">".$node->name."</span>" 
            if ($node->has_attributes()) { 
                $keys = array_keys($node->attributes); 
                for ($j = 0; $j < count($keys); $j++) { 
                    printf(" <span style=\"%s\">%s=\"</span><span style=\"%s\">%s</span><span style=\"%s\">\"</span>", $this->format_attribute_name, $keys[$j], $this->format_attribute_value, $node->attributes[$keys[$j]], $this->format_attribute_name); 
                } 
                echo " " 
            } 
 
            echo "<span style=\"".$this->format_element."\">$end_char</span><span style=\"".$this->format_bracket."\">></span>" 
 
            if (strlen($node->data) > 0) echo "<span style=\"".$this->format_data."\">".ltrim($node->data)."</span>" 
            else echo "<br>\n" 
        } 
 
        # Printing the footer 
        print "</body></html>\n" 
    } 
}