include/xml.php

   1 <?php
   2 /**
   3  * @file include/xml.php
   4  */
   5
   6
   7 /**
   8  * @brief This class contain functions to work with XML data
   9  *
  10  */
  11 class xml {
  12         /**
  13          * @brief Creates an XML structure out of a given array
  14          *
  15          * @param array $array The array of the XML structure that will be generated
  16          * @param object $xml The createdXML will be returned by reference
  17          * @param bool $remove_header Should the XML header be removed or not?
  18          * @param array $namespaces List of namespaces
  19          * @param bool $root - interally used parameter. Mustn't be used from outside.
  20          *
  21          * @return string The created XML
  22          */
  23         public static function from_array($array, &$xml, $remove_header = false, $namespaces = array(), $root = true) {
  24
  25                 if ($root) {
  26                         foreach($array as $key => $value) {
  27                                 foreach ($namespaces AS $nskey => $nsvalue)
  28                                         $key .= " xmlns".($nskey == "" ? "":":").$nskey.'="'.$nsvalue.'"';
  29
  30                                 $root = new SimpleXMLElement("<".$key."/>");
  31                                 self::from_array($value, $root, $remove_header, $namespaces, false);
  32
  33                                 $dom = dom_import_simplexml($root)->ownerDocument;
  34                                 $dom->formatOutput = true;
  35                                 $xml = $dom;
  36
  37                                 $xml_text = $dom->saveXML();
  38
  39                                 if ($remove_header)
  40                                         $xml_text = trim(substr($xml_text, 21));
  41
  42                                 return $xml_text;
  43                         }
  44                 }
  45
  46                 foreach($array as $key => $value) {
  47                         if ($key == "@attributes") {
  48                                 if (!isset($element) OR !is_array($value))
  49                                         continue;
  50
  51                                 foreach ($value as $attr_key => $attr_value) {
  52                                         $element_parts = explode(":", $attr_key);
  53                                         if ((count($element_parts) > 1) AND isset($namespaces[$element_parts[0]]))
  54                                                 $namespace = $namespaces[$element_parts[0]];
  55                                         else
  56                                                 $namespace = NULL;
  57
  58                                         $element->addAttribute ($attr_key, $attr_value, $namespace);
  59                                 }
  60
  61                                 continue;
  62                         }
  63
  64                         $element_parts = explode(":", $key);
  65                         if ((count($element_parts) > 1) AND isset($namespaces[$element_parts[0]]))
  66                                 $namespace = $namespaces[$element_parts[0]];
  67                         else
  68                                 $namespace = NULL;
  69
  70                         if (!is_array($value))
  71                                 $element = $xml->addChild($key, xmlify($value), $namespace);
  72                         elseif (is_array($value)) {
  73                                 $element = $xml->addChild($key, NULL, $namespace);
  74                                 self::from_array($value, $element, $remove_header, $namespaces, false);
  75                         }
  76                 }
  77         }
  78
  79         /**
  80          * @brief Copies an XML object
  81          *
  82          * @param object $source The XML source
  83          * @param object $target The XML target
  84          * @param string $elementname Name of the XML element of the target
  85          */
  86         public static function copy(&$source, &$target, $elementname) {
  87                 if (count($source->children()) == 0)
  88                         $target->addChild($elementname, xmlify($source));
  89                 else {
  90                         $child = $target->addChild($elementname);
  91                         foreach ($source->children() AS $childfield => $childentry)
  92                                 self::copy($childentry, $child, $childfield);
  93                 }
  94         }
  95
  96         /**
  97          * @brief Create an XML element
  98          *
  99          * @param object $doc XML root
 100          * @param string $element XML element name
 101          * @param string $value XML value
 102          * @param array $attributes array containing the attributes
 103          *
 104          * @return object XML element object
 105          */
 106         public static function create_element($doc, $element, $value = "", $attributes = array()) {
 107                 $element = $doc->createElement($element, xmlify($value));
 108
 109                 foreach ($attributes AS $key => $value) {
 110                         $attribute = $doc->createAttribute($key);
 111                         $attribute->value = xmlify($value);
 112                         $element->appendChild($attribute);
 113                 }
 114                 return $element;
 115         }
 116
 117         /**
 118          * @brief Create an XML and append it to the parent object
 119          *
 120          * @param object $doc XML root
 121          * @param object $parent parent object
 122          * @param string $element XML element name
 123          * @param string $value XML value
 124          * @param array $attributes array containing the attributes
 125          */
 126         public static function add_element($doc, $parent, $element, $value = "", $attributes = array()) {
 127                 $element = self::create_element($doc, $element, $value, $attributes);
 128                 $parent->appendChild($element);
 129         }
 130
 131         /**
 132          * @brief Convert an XML document to a normalised, case-corrected array
 133          *   used by webfinger
 134          *
 135          * @param object $xml_element The XML document
 136          * @param integer $recursion_depth recursion counter for internal use - default 0
 137          *    internal use, recursion counter
 138          *
 139          * @return array | sring The array from the xml element or the string
 140          */
 141         public static function element_to_array($xml_element, &$recursion_depth=0) {
 142
 143                 // If we're getting too deep, bail out
 144                 if ($recursion_depth > 512) {
 145                         return(null);
 146                 }
 147
 148                 if (!is_string($xml_element) &&
 149                 !is_array($xml_element) &&
 150                 (get_class($xml_element) == 'SimpleXMLElement')) {
 151                         $xml_element_copy = $xml_element;
 152                         $xml_element = get_object_vars($xml_element);
 153                 }
 154
 155                 if (is_array($xml_element)) {
 156                         $result_array = array();
 157                         if (count($xml_element) <= 0) {
 158                                 return (trim(strval($xml_element_copy)));
 159                         }
 160
 161                         foreach($xml_element as $key=>$value) {
 162
 163                                 $recursion_depth++;
 164                                 $result_array[strtolower($key)] =
 165                                         self::element_to_array($value, $recursion_depth);
 166                                 $recursion_depth--;
 167                         }
 168                         if ($recursion_depth == 0) {
 169                                 $temp_array = $result_array;
 170                                 $result_array = array(
 171                                         strtolower($xml_element_copy->getName()) => $temp_array,
 172                                 );
 173                         }
 174
 175                         return ($result_array);
 176
 177                 } else {
 178                         return (trim(strval($xml_element)));
 179                 }
 180         }
 181
 182         /**
 183          * @brief Convert the given XML text to an array in the XML structure.
 184          *
 185          * xml::to_array() will convert the given XML text to an array in the XML structure.
 186          * Link: http://www.bin-co.com/php/scripts/xml2array/
 187          * Portions significantly re-written by mike@macgirvin.com for Friendica
 188          * (namespaces, lowercase tags, get_attribute default changed, more...)
 189          *
 190          * Examples: $array =  xml::to_array(file_get_contents('feed.xml'));
 191          *              $array =  xml::to_array(file_get_contents('feed.xml', true, 1, 'attribute'));
 192          *
 193          * @param object $contents The XML text
 194          * @param boolean $namespaces True or false include namespace information
 195          *      in the returned array as array elements.
 196          * @param integer $get_attributes 1 or 0. If this is 1 the function will get the attributes as well as the tag values -
 197          *      this results in a different array structure in the return value.
 198          * @param string $priority Can be 'tag' or 'attribute'. This will change the way the resulting
 199          *       array sturcture. For 'tag', the tags are given more importance.
 200          *
 201          * @return array The parsed XML in an array form. Use print_r() to see the resulting array structure.
 202          */
 203         public static function to_array($contents, $namespaces = true, $get_attributes=1, $priority = 'attribute') {
 204                 if(!$contents) return array();
 205
 206                 if(!function_exists('xml_parser_create')) {
 207                         logger('xml::to_array: parser function missing');
 208                         return array();
 209                 }
 210
 211
 212                 libxml_use_internal_errors(true);
 213                 libxml_clear_errors();
 214
 215                 if($namespaces)
 216                         $parser = @xml_parser_create_ns("UTF-8",':');
 217                 else
 218                         $parser = @xml_parser_create();
 219
 220                 if(! $parser) {
 221                         logger('xml::to_array: xml_parser_create: no resource');
 222                         return array();
 223                 }
 224
 225                 xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, "UTF-8");
 226                 // http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
 227                 xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
 228                 xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1);
 229                 @xml_parse_into_struct($parser, trim($contents), $xml_values);
 230                 @xml_parser_free($parser);
 231
 232                 if(! $xml_values) {
 233                         logger('xml::to_array: libxml: parse error: ' . $contents, LOGGER_DATA);
 234                         foreach(libxml_get_errors() as $err)
 235                                 logger('libxml: parse: ' . $err->code . " at " . $err->line . ":" . $err->column . " : " . $err->message, LOGGER_DATA);
 236                         libxml_clear_errors();
 237                         return;
 238                 }
 239
 240                 //Initializations
 241                 $xml_array = array();
 242                 $parents = array();
 243                 $opened_tags = array();
 244                 $arr = array();
 245
 246                 $current = &$xml_array; // Reference
 247
 248                 // Go through the tags.
 249                 $repeated_tag_index = array(); // Multiple tags with same name will be turned into an array
 250                 foreach($xml_values as $data) {
 251                         unset($attributes,$value); // Remove existing values, or there will be trouble
 252
 253                         // This command will extract these variables into the foreach scope
 254                         // tag(string), type(string), level(int), attributes(array).
 255                         extract($data); // We could use the array by itself, but this cooler.
 256
 257                         $result = array();
 258                         $attributes_data = array();
 259
 260                         if(isset($value)) {
 261                                 if($priority == 'tag') $result = $value;
 262                                 else $result['value'] = $value; // Put the value in a assoc array if we are in the 'Attribute' mode
 263                         }
 264
 265                         //Set the attributes too.
 266                         if(isset($attributes) and $get_attributes) {
 267                                 foreach($attributes as $attr => $val) {
 268                                         if($priority == 'tag') $attributes_data[$attr] = $val;
 269                                         else $result['@attributes'][$attr] = $val; // Set all the attributes in a array called 'attr'
 270                                 }
 271                         }
 272
 273                         // See tag status and do the needed.
 274                         if($namespaces && strpos($tag,':')) {
 275                                 $namespc = substr($tag,0,strrpos($tag,':'));
 276                                 $tag = strtolower(substr($tag,strlen($namespc)+1));
 277                                 $result['@namespace'] = $namespc;
 278                         }
 279                         $tag = strtolower($tag);
 280
 281                         if($type == "open") {   // The starting of the tag '<tag>'
 282                                 $parent[$level-1] = &$current;
 283                                 if(!is_array($current) or (!in_array($tag, array_keys($current)))) { // Insert New tag
 284                                         $current[$tag] = $result;
 285                                         if($attributes_data) $current[$tag. '_attr'] = $attributes_data;
 286                                         $repeated_tag_index[$tag.'_'.$level] = 1;
 287
 288                                         $current = &$current[$tag];
 289
 290                                 } else { // There was another element with the same tag name
 291
 292                                         if(isset($current[$tag][0])) { // If there is a 0th element it is already an array
 293                                                 $current[$tag][$repeated_tag_index[$tag.'_'.$level]] = $result;
 294                                                 $repeated_tag_index[$tag.'_'.$level]++;
 295                                         } else { // This section will make the value an array if multiple tags with the same name appear together
 296                                                 $current[$tag] = array($current[$tag],$result); // This will combine the existing item and the new item together to make an array
 297                                                 $repeated_tag_index[$tag.'_'.$level] = 2;
 298
 299                                                 if(isset($current[$tag.'_attr'])) { // The attribute of the last(0th) tag must be moved as well
 300                                                         $current[$tag]['0_attr'] = $current[$tag.'_attr'];
 301                                                         unset($current[$tag.'_attr']);
 302                                                 }
 303
 304                                         }
 305                                         $last_item_index = $repeated_tag_index[$tag.'_'.$level]-1;
 306                                         $current = &$current[$tag][$last_item_index];
 307                                 }
 308
 309                         } elseif($type == "complete") { // Tags that ends in 1 line '<tag />'
 310                                 //See if the key is already taken.
 311                                 if(!isset($current[$tag])) { //New Key
 312                                         $current[$tag] = $result;
 313                                         $repeated_tag_index[$tag.'_'.$level] = 1;
 314                                         if($priority == 'tag' and $attributes_data) $current[$tag. '_attr'] = $attributes_data;
 315
 316                                 } else { // If taken, put all things inside a list(array)
 317                                         if(isset($current[$tag][0]) and is_array($current[$tag])) { // If it is already an array...
 318
 319                                                 // ...push the new element into that array.
 320                                                 $current[$tag][$repeated_tag_index[$tag.'_'.$level]] = $result;
 321
 322                                                 if($priority == 'tag' and $get_attributes and $attributes_data) {
 323                                                         $current[$tag][$repeated_tag_index[$tag.'_'.$level] . '_attr'] = $attributes_data;
 324                                                 }
 325                                                 $repeated_tag_index[$tag.'_'.$level]++;
 326
 327                                         } else { // If it is not an array...
 328                                                 $current[$tag] = array($current[$tag],$result); //...Make it an array using using the existing value and the new value
 329                                                 $repeated_tag_index[$tag.'_'.$level] = 1;
 330                                                 if($priority == 'tag' and $get_attributes) {
 331                                                         if(isset($current[$tag.'_attr'])) { // The attribute of the last(0th) tag must be moved as well
 332
 333                                                                 $current[$tag]['0_attr'] = $current[$tag.'_attr'];
 334                                                                 unset($current[$tag.'_attr']);
 335                                                         }
 336
 337                                                         if($attributes_data) {
 338                                                                 $current[$tag][$repeated_tag_index[$tag.'_'.$level] . '_attr'] = $attributes_data;
 339                                                         }
 340                                                 }
 341                                                 $repeated_tag_index[$tag.'_'.$level]++; // 0 and 1 indexes are already taken
 342                                         }
 343                                 }
 344
 345                         } elseif($type == 'close') { // End of tag '</tag>'
 346                                 $current = &$parent[$level-1];
 347                         }
 348                 }
 349
 350                 return($xml_array);
 351         }
 352 }
 353 ?>