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Json.php
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Json.php
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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Json
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Json.php 10020 2009-08-18 14:34:09Z j.fischer@metaways.de $
*/
/**
* Zend_Json_Expr.
*
* @see Zend_Json_Expr
*/
require_once 'Zend/Json/Expr.php';
/**
* Class for encoding to and decoding from JSON.
*
* @category Zend
* @package Zend_Json
* @uses Zend_Json_Expr
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Json
{
/**
* How objects should be encoded -- arrays or as StdClass. TYPE_ARRAY is 1
* so that it is a boolean true value, allowing it to be used with
* ext/json's functions.
*/
const TYPE_ARRAY = 1;
const TYPE_OBJECT = 0;
/**
* To check the allowed nesting depth of the XML tree during xml2json conversion.
*
* @var int
*/
public static $maxRecursionDepthAllowed=25;
/**
* @var bool
*/
public static $useBuiltinEncoderDecoder = false;
/**
* Decodes the given $encodedValue string which is
* encoded in the JSON format
*
* Uses ext/json's json_decode if available.
*
* @param string $encodedValue Encoded in JSON format
* @param int $objectDecodeType Optional; flag indicating how to decode
* objects. See {@link Zend_Json_Decoder::decode()} for details.
* @return mixed
*/
public static function decode($encodedValue, $objectDecodeType = Zend_Json::TYPE_ARRAY)
{
if (function_exists('json_decode') && self::$useBuiltinEncoderDecoder !== true) {
return json_decode($encodedValue, $objectDecodeType);
}
require_once 'Zend/Json/Decoder.php';
return Zend_Json_Decoder::decode($encodedValue, $objectDecodeType);
}
/**
* Encode the mixed $valueToEncode into the JSON format
*
* Encodes using ext/json's json_encode() if available.
*
* NOTE: Object should not contain cycles; the JSON format
* does not allow object reference.
*
* NOTE: Only public variables will be encoded
*
* NOTE: Encoding native javascript expressions are possible using Zend_Json_Expr.
* You can enable this by setting $options['enableJsonExprFinder'] = true
*
* @see Zend_Json_Expr
*
* @param mixed $valueToEncode
* @param boolean $cycleCheck Optional; whether or not to check for object recursion; off by default
* @param array $options Additional options used during encoding
* @return string JSON encoded object
*/
public static function encode($valueToEncode, $cycleCheck = false, $options = array())
{
if (is_object($valueToEncode) && method_exists($valueToEncode, 'toJson')) {
return $valueToEncode->toJson();
}
// Pre-encoding look for Zend_Json_Expr objects and replacing by tmp ids
$javascriptExpressions = array();
if(isset($options['enableJsonExprFinder'])
&& ($options['enableJsonExprFinder'] == true)
) {
/**
* @see Zend_Json_Encoder
*/
require_once "Zend/Json/Encoder.php";
$valueToEncode = self::_recursiveJsonExprFinder($valueToEncode, $javascriptExpressions);
}
// Encoding
if (function_exists('json_encode') && self::$useBuiltinEncoderDecoder !== true) {
$encodedResult = json_encode($valueToEncode);
} else {
require_once 'Zend/Json/Encoder.php';
$encodedResult = Zend_Json_Encoder::encode($valueToEncode, $cycleCheck, $options);
}
//only do post-proccessing to revert back the Zend_Json_Expr if any.
if (count($javascriptExpressions) > 0) {
$count = count($javascriptExpressions);
for($i = 0; $i < $count; $i++) {
$magicKey = $javascriptExpressions[$i]['magicKey'];
$value = $javascriptExpressions[$i]['value'];
$encodedResult = str_replace(
//instead of replacing "key:magicKey", we replace directly magicKey by value because "key" never changes.
'"' . $magicKey . '"',
$value,
$encodedResult
);
}
}
return $encodedResult;
}
/**
* Check & Replace Zend_Json_Expr for tmp ids in the valueToEncode
*
* Check if the value is a Zend_Json_Expr, and if replace its value
* with a magic key and save the javascript expression in an array.
*
* NOTE this method is recursive.
*
* NOTE: This method is used internally by the encode method.
*
* @see encode
* @param mixed $valueToCheck a string - object property to be encoded
* @return void
*/
protected static function _recursiveJsonExprFinder(
&$value, array &$javascriptExpressions, $currentKey = null
) {
if ($value instanceof Zend_Json_Expr) {
// TODO: Optimize with ascii keys, if performance is bad
$magicKey = "____" . $currentKey . "_" . (count($javascriptExpressions));
$javascriptExpressions[] = array(
//if currentKey is integer, encodeUnicodeString call is not required.
"magicKey" => (is_int($currentKey)) ? $magicKey : Zend_Json_Encoder::encodeUnicodeString($magicKey),
"value" => $value->__toString(),
);
$value = $magicKey;
} elseif (is_array($value)) {
foreach ($value as $k => $v) {
$value[$k] = self::_recursiveJsonExprFinder($value[$k], $javascriptExpressions, $k);
}
} elseif (is_object($value)) {
foreach ($value as $k => $v) {
$value->$k = self::_recursiveJsonExprFinder($value->$k, $javascriptExpressions, $k);
}
}
return $value;
}
/**
* fromXml - Converts XML to JSON
*
* Converts a XML formatted string into a JSON formatted string.
* The value returned will be a string in JSON format.
*
* The caller of this function needs to provide only the first parameter,
* which is an XML formatted String. The second parameter is optional, which
* lets the user to select if the XML attributes in the input XML string
* should be included or ignored in xml2json conversion.
*
* This function converts the XML formatted string into a PHP array by
* calling a recursive (protected static) function in this class. Then, it
* converts that PHP array into JSON by calling the "encode" static funcion.
*
* Throws a Zend_Json_Exception if the input not a XML formatted string.
* NOTE: Encoding native javascript expressions via Zend_Json_Expr is not possible.
*
* @static
* @access public
* @param string $xmlStringContents XML String to be converted
* @param boolean $ignoreXmlAttributes Include or exclude XML attributes in
* the xml2json conversion process.
* @return mixed - JSON formatted string on success
* @throws Zend_Json_Exception
*/
public static function fromXml ($xmlStringContents, $ignoreXmlAttributes=true) {
// Load the XML formatted string into a Simple XML Element object.
$simpleXmlElementObject = simplexml_load_string($xmlStringContents);
// If it is not a valid XML content, throw an exception.
if ($simpleXmlElementObject == null) {
require_once 'Zend/Json/Exception.php';
throw new Zend_Json_Exception('Function fromXml was called with an invalid XML formatted string.');
} // End of if ($simpleXmlElementObject == null)
$resultArray = null;
// Call the recursive function to convert the XML into a PHP array.
$resultArray = self::_processXml($simpleXmlElementObject, $ignoreXmlAttributes);
// Convert the PHP array to JSON using Zend_Json encode method.
// It is just that simple.
$jsonStringOutput = self::encode($resultArray);
return($jsonStringOutput);
} // End of function fromXml.
/**
* _processXml - Contains the logic for xml2json
*
* The logic in this function is a recursive one.
*
* The main caller of this function (i.e. fromXml) needs to provide
* only the first two parameters i.e. the SimpleXMLElement object and
* the flag for ignoring or not ignoring XML attributes. The third parameter
* will be used internally within this function during the recursive calls.
*
* This function converts the SimpleXMLElement object into a PHP array by
* calling a recursive (protected static) function in this class. Once all
* the XML elements are stored in the PHP array, it is returned to the caller.
*
* Throws a Zend_Json_Exception if the XML tree is deeper than the allowed limit.
*
* @static
* @access protected
* @param SimpleXMLElement $simpleXmlElementObject XML element to be converted
* @param boolean $ignoreXmlAttributes Include or exclude XML attributes in
* the xml2json conversion process.
* @param int $recursionDepth Current recursion depth of this function
* @return mixed - On success, a PHP associative array of traversed XML elements
* @throws Zend_Json_Exception
*/
protected static function _processXml ($simpleXmlElementObject, $ignoreXmlAttributes, $recursionDepth=0) {
// Keep an eye on how deeply we are involved in recursion.
if ($recursionDepth > self::$maxRecursionDepthAllowed) {
// XML tree is too deep. Exit now by throwing an exception.
require_once 'Zend/Json/Exception.php';
throw new Zend_Json_Exception(
"Function _processXml exceeded the allowed recursion depth of " .
self::$maxRecursionDepthAllowed);
} // End of if ($recursionDepth > self::$maxRecursionDepthAllowed)
if ($recursionDepth == 0) {
// Store the original SimpleXmlElementObject sent by the caller.
// We will need it at the very end when we return from here for good.
$callerProvidedSimpleXmlElementObject = $simpleXmlElementObject;
} // End of if ($recursionDepth == 0)
if ($simpleXmlElementObject instanceof SimpleXMLElement) {
// Get a copy of the simpleXmlElementObject
$copyOfSimpleXmlElementObject = $simpleXmlElementObject;
// Get the object variables in the SimpleXmlElement object for us to iterate.
$simpleXmlElementObject = get_object_vars($simpleXmlElementObject);
} // End of if (get_class($simpleXmlElementObject) == "SimpleXMLElement")
// It needs to be an array of object variables.
if (is_array($simpleXmlElementObject)) {
// Initialize a result array.
$resultArray = array();
// Is the input array size 0? Then, we reached the rare CDATA text if any.
if (count($simpleXmlElementObject) <= 0) {
// Let us return the lonely CDATA. It could even be
// an empty element or just filled with whitespaces.
return (trim(strval($copyOfSimpleXmlElementObject)));
} // End of if (count($simpleXmlElementObject) <= 0)
// Let us walk through the child elements now.
foreach($simpleXmlElementObject as $key=>$value) {
// Check if we need to ignore the XML attributes.
// If yes, you can skip processing the XML attributes.
// Otherwise, add the XML attributes to the result array.
if(($ignoreXmlAttributes == true) && (is_string($key)) && ($key == "@attributes")) {
continue;
} // End of if(($ignoreXmlAttributes == true) && ($key == "@attributes"))
// Let us recursively process the current XML element we just visited.
// Increase the recursion depth by one.
$recursionDepth++;
$resultArray[$key] = self::_processXml ($value, $ignoreXmlAttributes, $recursionDepth);
// Decrease the recursion depth by one.
$recursionDepth--;
} // End of foreach($simpleXmlElementObject as $key=>$value) {
if ($recursionDepth == 0) {
// That is it. We are heading to the exit now.
// Set the XML root element name as the root [top-level] key of
// the associative array that we are going to return to the original
// caller of this recursive function.
$tempArray = $resultArray;
$resultArray = array();
$resultArray[$callerProvidedSimpleXmlElementObject->getName()] = $tempArray;
} // End of if ($recursionDepth == 0)
return($resultArray);
} else {
// We are now looking at either the XML attribute text or
// the text between the XML tags.
// In order to allow Zend_Json_Expr from xml, we check if the node
// matchs the pattern that try to detect if it is a new Zend_Json_Expr
// if it matches, we return a new Zend_Json_Expr instead of a text node
$pattern = '/^[\s]*new Zend_Json_Expr[\s]*\([\s]*[\"\']{1}(.*)[\"\']{1}[\s]*\)[\s]*$/';
$matchings = array();
$match = preg_match ($pattern, $simpleXmlElementObject, $matchings);
if ($match) {
return new Zend_Json_Expr($matchings[1]);
} else {
return (trim(strval($simpleXmlElementObject)));
}
} // End of if (is_array($simpleXmlElementObject))
} // End of function _processXml.
}

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