php之XML转数组函数的详解

如下所示：
复制代码代码如下:
<？
/**
* 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）;
}
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函数描述及例子:
复制代码代码如下:
$arr = xml2array（file_get_contents（"tools.xml"）,1,"attribute"）;