<?php

/**
 * http://phptunes.blogspot.com/2007/01/phpjson.html
 */
class json
{ 
    static $DEFAULT_ENCODING = 'windows-1251//IGNORE';
    static $INTERNAL_ENCODING = 'utf-8';

    static function encode($var)
    {
        return php2js($var); //json_encode(self::prepare($var, array('self', 'unicode_encode')));
    }

    // Преобразование json в массив
    static function decode($var, $encoding = 'utf-8', $is_array = false)
    {
        if ($encoding != 'utf-8') $var = iconv($encoding, self::$INTERNAL_ENCODING, $var);
        return self::prepare(json_decode($var, $is_array), array('self', 'unicode_decode'));
    }

    static function ident($var)
    {
        return $var;
    }

    /* windows-1251 -> utf-8 */
    static function unicode_encode($var) 
    {
        return @iconv(self::$DEFAULT_ENCODING, self::$INTERNAL_ENCODING, $var);
    }

    /* utf-8 -> windows-1251 */
    static function unicode_decode($var)
    {
        return @iconv(self::$INTERNAL_ENCODING, self::$DEFAULT_ENCODING, $var);
    }

    static function prepare($var, $encode)
    {
        if (is_array($var)) {
            $new = array();
            foreach ($var as $k => $v) {
                $new[self::prepare($k, $encode)] = self::prepare($v, $encode);
            }
            $var = $new;
        } elseif (is_object($var)) {
            // Было преобразование типа для отображения !!
            $vars = get_object_vars($var);
            foreach ($vars as $m => $v) {
                $var->$m = self::prepare($var->$m, $encode);
            }
        } elseif (is_string($var)) {
            $var = call_user_func($encode, $var);
        }
        return $var;
    }
}

function php2js($a = false) {
    if (is_null($a)) return 'null';
    if ($a === false) return 'false';
    if ($a === true) return 'true';
    if (is_scalar($a)) {
        if (is_float($a)) {
            // Always use "." for floats.
            $a = str_replace(",", ".", strval($a));
        } else if (is_int($a)) {
            return $a;            
        }    
        // All scalars are converted to strings to avoid indeterminism.
        // PHP's "1" and 1 are equal for all PHP operators, but
        // JS's "1" and 1 are not. So if we pass "1" or 1 from the PHP backend,
        // we should get the same result in the JS frontend (string).
        // Character replacements for JSON.
        static $jsonReplaces = array(
            array("\\", "/", "\n", "\t", "\r", "\b", "\f", '"'), 
            array('\\\\', '\\/', '\\n', '\\t', '\\r', '\\b', '\\f', '\"'));
        return '"' . str_replace($jsonReplaces[0], $jsonReplaces[1], $a) . '"';
    }
    $isList = true;
    for ($i = 0, reset($a);$i < count($a);$i++, next($a)) {
        if (key($a) !== $i) {
            $isList = false;
            break;
        }
    }
    $result = array();
    if ($isList) {
        foreach($a as $v) $result[] = php2js($v);
        return '[' . join(',', $result) . ']';
    } else {
        foreach($a as $k => $v) $result[] = php2js($k) . ':' . php2js($v);
        return '{' . join(',', $result) . '}';
    }
}