PHP XML操作类 xml2array -- 含节点属性

1. 单向xml2array函数

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-lossxml_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.$repeated_tag_index = array();//Multiple tags with same name will be turned into an arrayforeach($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);
}

$priority设置为空的时候，可以获取所有节点属性值。

优点：获取的节点属性不占用数组父级键。

缺点： $priority设置为tag时，获取节点属性值不太理想。

2. 双向xml2array和array2xml函数

<?php ###################################################################################
# xml2array: takes raw XML as a parameter (a string)
# and returns an equivalent PHP data structure
###################################################################################
function & xml2array(&$xml,$attr=true){ $xml_parser = &new XML(); $xml_parser->attr = $attr; $data = &$xml_parser->parse($xml); $xml_parser->destruct(); return $data;
}
###################################################################################
# array2xml: serializes any PHP data structure into XML
# Takes one parameter: the data to serialize. Must be an array.
###################################################################################
function & array2xml(&$data, $level = 0, $prior_key = NULL){ if($level == 0){ ob_start(); echo '<?xml version="1.0" ?>',"\n"; } while(list($key, $value) = each($data)) if(!strpos($key, '_attr')) #if it's not an attribute #we don't treat attributes by themselves, so for an empty element # that has attributes you still need to set the element to NULL if(is_array($value) and array_key_exists(0, $value)){ array2xml($value, $level, $key); }else{ $tag = $prior_key ? $prior_key : $key; echo str_repeat("\t", $level),'<',$tag; if(array_key_exists($key.'_attr', $data)){ #if there's an attribute for this element while(list($attr_name, $attr_value) = each($data[$key.'_attr'])) echo ' ',$attr_name,'="',htmlspecialchars($attr_value),'"'; reset($data[$key.'_attr']); } if(is_null($value)) echo " />\n"; elseif(!is_array($value)) echo '>',htmlspecialchars($value),"</$tag>\n"; else echo ">\n",array2xml($value, $level+1),str_repeat("\t", $level),"</$tag>\n"; } reset($data); if($level == 0){ $str = &ob_get_contents(); ob_end_clean(); return $str; }
}
###################################################################################
# XML class: utility class to be used with PHP's XML handling functions
###################################################################################
class XML
{ var $parser;   #a reference to the XML parser var $document; #the entire XML structure built up so far var $parent;   #a pointer to the current parent - the parent will be an array var $stack;    #a stack of the most recent parent at each nesting level var $last_opened_tag; #keeps track of the last tag opened. var $attr = true;function XML(){ $this->parser = &xml_parser_create(); xml_parser_set_option(&$this->parser, XML_OPTION_CASE_FOLDING, false); xml_set_object(&$this->parser, &$this); xml_set_element_handler(&$this->parser, 'open','close'); xml_set_character_data_handler(&$this->parser, 'data'); } function destruct(){ xml_parser_free(&$this->parser); } function & parse(&$data){ $this->document = array(); $this->stack    = array(); $this->parent   = &$this->document; return xml_parse(&$this->parser, &$data, true) ? $this->document : NULL; } function open(&$parser, $tag, $attributes){ $this->data = '';  #stores temporary cdata$this->last_opened_tag = $tag; #if you've seen this tag beforeif(is_array($this->parent) and array_key_exists($tag,$this->parent)){  #if the keys are numeric#this is the third or later instance of $tag we've come across if(is_array($this->parent[$tag]) and array_key_exists(0,$this->parent[$tag])) $key = $this->count_numeric_items($this->parent[$tag]); else{ #this is the second instance of $tag that we've seen. shift around if(array_key_exists($tag.'_attr',$this->parent)){ $arr = array('0_attr'=>&$this->parent[$tag.'_attr'], &$this->parent[$tag]); unset($this->parent[$tag.'_attr']); }else $arr = array(&$this->parent[$tag]); $this->parent[$tag] = &$arr; $key = 1; } $this->parent = &$this->parent[$tag]; }else $key = $tag; if($attributes AND $this->attr) $this->parent[$key.'_attr'] = $attributes; $this->parent  = &$this->parent[$key]; $this->stack[] = &$this->parent; } function data(&$parser, $data){ #you don't need to store whitespace in between tagsif($this->last_opened_tag != NULL) $this->data .= $data; } function close(&$parser, $tag){ if($this->last_opened_tag == $tag){ $this->parent = $this->data; $this->last_opened_tag = NULL; } array_pop($this->stack); if($this->stack) $this->parent = &$this->stack[count($this->stack)-1]; } function count_numeric_items(&$array){ return is_array($array) ? count(array_filter(array_keys($array), 'is_numeric')) : 0; }
}

实例：

<?php
include('xml.php');
$data = xml2array($xml);
?>

<?php
include('xml.php');
$xml = array2xml($data);
?>

来源： http://keithdevens.com/software/phpxml

该类已根据来源代码做了修改。

如果$attr设置为false，输出的数组中将不包括节点属性值。

优点：获取节点属性值较理想。

缺点：获取的节点属性占用数组父级键

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