PHP实现XML与数据格式进行转换类实例

<?php /** * xml2array() will convert the given XML text to an array in the XML structure. * Link: * 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"); // 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); } // Array to XML class array2xml { public $output = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"; public $sub_item = array(); public function __construct($array) { $sub_item = array(); $this->output .= $this->xmlmake($array); } public function xmlmake($array, $fk = '') { $xml = ''; global $sub_item; foreach ($array as $key => $value) { if (is_array($value)) { if (is_numeric($key)) { $this->sub_item=array_merge($this->sub_item,array($fk)); $xml .= "<{$fk}>" . $this->xmlmake($value, $key) . "</{$fk}>"; } else { $xml .= "<{$key}>" . $this->xmlmake($value, $key) . "</{$key}>"; } } else { $xml .= "<{$key}>{$value}</{$key}>\n"; } } return $xml; } public function output(){ foreach($this->sub_item as $t){ $this->output = str_replace("<{$t}><{$t}>","<{$t}>",$this->output); $this->output = str_replace("</{$t}></{$t}>","</{$t}>",$this->output); } return $this->output; } }