php 编写xml分析类功能实例

php编写的xml分析类，感兴趣的小伙伴，下面一起跟随编程之家 jb51.cc的小编来看看吧。
经测试代码如下：

/**
 * xml分析类
 *
 * @param 
 * @arrange (编程之家) jb51.cc
 **/
************************************************************************
Example:
************************************************************************
 
 
$xml = new XML('artikel.xml'); 
$xml->print_nodes(); 
 
?>    
 
***********************************************************************
Script
***********************************************************************
 
 
<?php 
＃此脚本根据某些规则格式化xml文件。 这些规则
＃在xml_set_character_data_handler的函数中处理
# define。 我们必须记住，我们在哪个元素，此外，
＃当前元素具有的祖先元素。
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,$data) { 
        if (preg_match(/xml:stylesheet/,$match) && preg_match(/type=\text\/xsl\/,$match)) { 
            preg_match(/href=\(.+)\/i,$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,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 
    } 
}


/***   代码来自编程之家 jb51.cc（jb51.cc）   ***/