php xml转json格式怎么转换

php xml转json格式的方法：首先创建一个PHP示例文件；然后通过“function xmlToArray($xml, $options = array()){...}”方法将一个xml文件的数据转换为Json格式数据即可。

本文操作环境：windows7系统、PHP7.1版，DELL G3电脑

PHP XML 与 JSON 相互转换

XML 转 JSON

以下代码演示了如何将一个 xml 文件的数据转换为 Json 格式数据：

function xmlToArray($xml, $options = array()) {
    $defaults = array(
   'namespaceSeparator' => ':',//you may want this to be something other than a colon
   'attributePrefix' => '@',   //to distinguish between attributes and nodes with the same name
   'alwaysArray' => array(),   //array of xml tag names which should always become arrays
   'autoArray' => true,   //only create arrays for tags which appear more than once
   'textContent' => '$',  //key used for the text content of elements
   'autoText' => true,    //skip textContent key if node has no attributes or child nodes
   'keySearch' => false,  //optional search and replace on tag and attribute names
   'keyReplace' => false  //replace values for above search values (as passed to str_replace())
    );
    $options = array_merge($defaults, $options);
    $namespaces = $xml->getDocNamespaces();
    $namespaces[''] = null; //add base (empty) namespace
 
    //get attributes from all namespaces
    $attributesArray = array();
    foreach ($namespaces as $prefix => $namespace) {
   foreach ($xml->attributes($namespace) as $attributeName => $attribute) {
  //replace characters in attribute name
  if ($options['keySearch']) $attributeName =
str_replace($options['keySearch'], $options['keyReplace'], $attributeName);
  $attributeKey = $options['attributePrefix']
. ($prefix ? $prefix . $options['namespaceSeparator'] : '')
. $attributeName;
  $attributesArray[$attributeKey] = (string)$attribute;
   }
    }
 
    //get child nodes from all namespaces
    $tagsArray = array();
    foreach ($namespaces as $prefix => $namespace) {
   foreach ($xml->children($namespace) as $childXml) {
  //recurse into child nodes
  $childArray = xmlToArray($childXml, $options);
  list($childTagName, $childProperties) = each($childArray);
 
  //replace characters in tag name
  if ($options['keySearch']) $childTagName =
str_replace($options['keySearch'], $options['keyReplace'], $childTagName);
  //add namespace prefix, if any
  if ($prefix) $childTagName = $prefix . $options['namespaceSeparator'] . $childTagName;
 
  if (!isset($tagsArray[$childTagName])) {
 //only entry with this key
 //test if tags of this type should always be arrays, no matter the element count
 $tagsArray[$childTagName] =
    in_array($childTagName, $options['alwaysArray']) || !$options['autoArray']
    ? array($childProperties) : $childProperties;
  } elseif (
 is_array($tagsArray[$childTagName]) && array_keys($tagsArray[$childTagName])
 === range(0, count($tagsArray[$childTagName]) - 1)
  ) {
 //key already exists and is integer indexed array
 $tagsArray[$childTagName][] = $childProperties;
  } else {
 //key exists so convert to integer indexed array with previous value in position 0
 $tagsArray[$childTagName] = array($tagsArray[$childTagName], $childProperties);
  }
   }
    }
 
    //get text content of node
    $textContentArray = array();
    $plainText = trim((string)$xml);
    if ($plainText !== '') $textContentArray[$options['textContent']] = $plainText;
 
    //stick it all together
    $propertiesArray = !$options['autoText'] || $attributesArray || $tagsArray || ($plainText === '')
  ? array_merge($attributesArray, $tagsArray, $textContentArray) : $plainText;
 
    //return node as array
    return array(
   $xml->getName() => $propertiesArray
    );
}

使用实例

$xmlNode = simplexml_load_file('example.xml');
$arrayData = xmlToArray($xmlNode);
echo json_encode($arrayData);
JSON 转 XML
以下代码将 JSON 数据格式作为 XML 输出：
<?php
$json = stream_get_contents(STDIN);
$data = @json_decode($json, false);
if (!is_array($data) && !is_object($data)) {
    echo 'ERROR: Invalid JSON given' . PHP_EOL;
    exit(1);
}
class Exporter
{
    private $root = 'document';
    private $indentation = '    ';
    // TODO: private $this->addtypes = false; // type="string|int|float|array|null|bool"
    public function export($data)
    {
   $data = array($this->root => $data);
   echo '<?xml version="1.0" encoding="UTF-8">';
   $this->recurse($data, 0);
   echo PHP_EOL;
    }
    private function recurse($data, $level)
    {
   $indent = str_repeat($this->indentation, $level);
   foreach ($data as $key => $value) {
  echo PHP_EOL . $indent . '<' . $key;
  if ($value === null) {
 echo ' />';
  } else {
 echo '>';
 if (is_array($value)) {
if ($value) {
    $temporary = $this->getArrayName($key);
    foreach ($value as $entry) {
   $this->recurse(array($temporary => $entry), $level + 1);
    }
    echo PHP_EOL . $indent;
}
 } else if (is_object($value)) {
if ($value) {
    $this->recurse($value, $level + 1);
    echo PHP_EOL . $indent;
}
 } else {
if (is_bool($value)) {
    $value = $value ? 'true' : 'false';
}
echo $this->escape($value);
 }
 echo '</' . $key . '>';
  }
   }
    }
    private function escape($value)
    {
   // TODO:
   return $value;
    }
    private function getArrayName($parentName)
    {
   // TODO: special namding for tag names within arrays
   return $parentName;
    }
}
$exporter = new Exporter();
$exporter->export($data);

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