关于操作PHP 操作XML

[asasdaf]

<?xml version="1.0" encoding="UTF-8"?>
<node>
<nodes>
<node name="level1" title="level1">
<nodes>
<node name="level2" title="level2">
<nodes>
<node name="level3_1" >
<nodes>
<node name="400001"></node>
<node name="400002"></node>
<node name="400003"></node>
<node name="400004"></node>
<node name="400005"></node>
<node name="400006"></node>
</nodes>
</node>
<node name="level3_2" >
<nodes>
<node name="400011"></node>
<node name="400012"></node>
<node name="400013"></node>
<node name="400014"></node>
<node name="400015"></node>
<node name="400016"></node>
</nodes>
</node>
<node name="level3_3" >
<nodes>
<node name="400021"></node>
<node name="400022"></node>
<node name="400023"></node>
<node name="400024"></node>
<node name="400025"></node>
<node name="400026"></node>
</nodes>
</node>
</nodes>
</node>
</nodes>
</node>
</nodes>
</node>



怎么操作这种XML，节点名字是互相嵌套，但是目前给的就是这种格式的，不能说要求改节点名字什么的。怎么把<node name="400021"></node>这种的name取出来。也就是说怎么定位到这个元素

[一起混吧]

$data = <<<XML
<?xml version="1.0" encoding="UTF-8"?>
<node>
<nodes>
<node name="level1" title="level1">
<nodes>
<node name="level2" title="level2">
<nodes>
<node name="level3_1" >
<nodes>
<node name="400001"></node>
<node name="400002"></node>
<node name="400003"></node>
<node name="400004"></node>
<node name="400005"></node>
<node name="400006"></node>
</nodes>
</node>
<node name="level3_2" >
<nodes>
<node name="400011"></node>
<node name="400012"></node>
<node name="400013"></node>
<node name="400014"></node>
<node name="400015"></node>
<node name="400016"></node>
</nodes>
</node>
<node name="level3_3" >
<nodes>
<node name="400021"></node>
<node name="400022"></node>
<node name="400023"></node>
<node name="400024"></node>
<node name="400025"></node>
<node name="400026"></node>
</nodes>
</node>
</nodes>
</node>
</nodes>
</node>
</nodes>
</node>
XML;
$xml = simplexml_load_string($data);
print_r($xml); 去结果中找。可能要遍历

[foolbirdflyfirst]

这文件完全不合xml文件规范，用正则好了
参考

$c = file_get_contents('./x.xml');//x.xml是数据文件
preg_match_all('#<node[^>]*name="(\d+)"[^>]*>(?:(?!</?node).)*</node>#is',$c,$m);
echo "<pre/>";
print_r(array_map("htmlspecialchars",$m[0]));

[asasdaf]

那给的就是这样的文档，那数据量很大的时候怎么办。我这边只是给出一个大概的样子

[asasdaf]

可能没出清楚，要做出一个层级关系。有第一层，点击出现第二层。这样的

[kyzy_yy_pm]

不过你数据量多大，既然你的需求是要有层次关系，那么你多数也只能加载xml了

[smcfy]

楼主可以去网上搜一下有很多把xml转换成array方法的，节点和属性都可以转换成array，然后从数组里找你想要的信息，给你一个我现在用的吧，感觉还比较好用的，楼主可以把结果var_dump出来看一下格式

<?php
/**

* xml2array() will convert the given XML text to an array in the XML structure.
* Link: http://www.bin-co.com/php/scripts/xml2array/
* Arguments : $contents - The XML text
*                 $get_attributes - 1 or 0. If this is 1 the function will get the attributes as well as the tag values - this results in a different array structure in the return value.
*                 $priority - Can be 'tag' or 'attribute'. This will change the way the resulting array sturcture. For 'tag', the tags are given more importance.
* Return: The parsed XML in an array form. Use print_r() to see the resulting array structure.
* Examples: $array =   xml2array(file_get_contents('feed.xml'));
*               $array =   xml2array(file_get_contents('feed.xml', 1, 'attribute'));
*/
function xml2array($contents, $get_attributes=1, $priority = 'tag') {
     if(!$contents) return array();

     if(!function_exists('xml_parser_create')) {
        //print "'xml_parser_create()' function not found!";
        return array();
     }

    //Get the XML parser of PHP - PHP must have this module for the parser to work
    $parser = xml_parser_create('');
    xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, "UTF-8"); # http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
    xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
    xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1);
    xml_parse_into_struct($parser, trim($contents), $xml_values);
    xml_parser_free($parser);

     if(!$xml_values) return;//Hmm

     //Initializations
    $xml_array = array();
    $parents = array();
    $opened_tags = array();
    $arr = array();

    $current = &$xml_array; //Refference

     //Go through the tags.
    $repeated_tag_index = array();//Multiple tags with same name will be turned into an array
    foreach($xml_values as $data) {
         unset($attributes,$value);//Remove existing values, or there will be trouble

         //This command will extract these variables into the foreach scope
         // tag(string), type(string), level(int), attributes(array).
        extract($data);//We could use the array by itself, but this cooler.

        $result = array();
        $attributes_data = array();

         if(isset($value)) {
             if($priority == 'tag') $result = $value;
             else $result['value'] = $value; //Put the value in a assoc array if we are in the 'Attribute' mode
        }

        //Set the attributes too.
        if(isset($attributes) and $get_attributes) {
             foreach($attributes as $attr => $val) {
                 if($priority == 'tag') $attributes_data[$attr] = $val;
                 else $result['attr'][$attr] = $val; //Set all the attributes in a array called 'attr'
            }
         }

        //See tag status and do the needed.
        if($type == "open") {//The starting of the tag '<tag>'
            $parent[$level-1] = &$current;
             if(!is_array($current) or (!in_array($tag, array_keys($current)))) { //Insert New tag
                $current[$tag] = $result;
                 if($attributes_data) $current[$tag. '_attr'] = $attributes_data;
                $repeated_tag_index[$tag.'_'.$level] = 1;

                $current = &$current[$tag];

             } else { //There was another element with the same tag name

                if(isset($current[$tag][0])) {//If there is a 0th element it is already an array
                    $current[$tag][$repeated_tag_index[$tag.'_'.$level]] = $result;
                    $repeated_tag_index[$tag.'_'.$level]++;
                 } else {//This section will make the value an array if multiple tags with the same name appear together
                    $current[$tag] = array($current[$tag],$result);//This will combine the existing item and the new item together to make an array
                    $repeated_tag_index[$tag.'_'.$level] = 2;

                     if(isset($current[$tag.'_attr'])) { //The attribute of the last(0th) tag must be moved as well
                        $current[$tag]['0_attr'] = $current[$tag.'_attr'];
                         unset($current[$tag.'_attr']);
                     }

                 }
                $last_item_index = $repeated_tag_index[$tag.'_'.$level]-1;
                $current = &$current[$tag][$last_item_index];
             }

         } elseif($type == "complete") { //Tags that ends in 1 line '<tag />'
             //See if the key is already taken.
            if(!isset($current[$tag])) { //New Key
                $current[$tag] = $result;
                $repeated_tag_index[$tag.'_'.$level] = 1;
                 if($priority == 'tag' and $attributes_data) $current[$tag. '_attr'] = $attributes_data;

             } else { //If taken, put all things inside a list(array)
                if(isset($current[$tag][0]) and is_array($current[$tag])) {//If it is already an array

                     // push the new element into that array.
                    $current[$tag][$repeated_tag_index[$tag.'_'.$level]] = $result;

                     if($priority == 'tag' and $get_attributes and $attributes_data) {
                        $current[$tag][$repeated_tag_index[$tag.'_'.$level] . '_attr'] = $attributes_data;
                     }
                    $repeated_tag_index[$tag.'_'.$level]++;

                 } else { //If it is not an array
                    $current[$tag] = array($current[$tag],$result); //Make it an array using using the existing value and the new value
                    $repeated_tag_index[$tag.'_'.$level] = 1;
                     if($priority == 'tag' and $get_attributes) {
                         if(isset($current[$tag.'_attr'])) { //The attribute of the last(0th) tag must be moved as well

                            $current[$tag]['0_attr'] = $current[$tag.'_attr'];
                             unset($current[$tag.'_attr']);
                         }

                         if($attributes_data) {
                            $current[$tag][$repeated_tag_index[$tag.'_'.$level] . '_attr'] = $attributes_data;
                         }
                     }
                    $repeated_tag_index[$tag.'_'.$level]++; //0 and 1 index is already taken
                }
             }

         } elseif($type == 'close') { //End of tag '</tag>'
            $current = &$parent[$level-1];
         }
     }
     return($xml_array);
} 

[MMDD0827]

simplexml 应该可以~
不过如果大数据量得话就不好说了……