json.class.php

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<?php
class json
{
    var $at   = 0;
    var $ch   = '';
    var $text = '';

    function encode($arg)
    {

        $returnValue = '';
        $c           = '';
        $i           = '';
        $l           = '';
        $s           = '';
        $v           = '';
        $numeric     = true;

        switch (gettype($arg))
        {
            case 'array':
                foreach ($arg AS $i => $v)
                {
                    if (!is_numeric($i))
                    {
                        $numeric = false;
                        break;
                    }
                }

                if ($numeric)
                {
                    foreach ($arg AS $i => $v)
                    {
                        if (strlen($s) > 0)
                        {
                            $s .= ',';
                        }
                        $s .= $this->encode($arg[$i]);
                    }

                    $returnValue = '[' . $s . ']';
                }
                else
                {
                    foreach ($arg AS $i => $v)
                    {
                        if (strlen($s) > 0)
                        {
                            $s .= ',';
                        }
                        $s .= $this->encode($i) . ':' . $this->encode($arg[$i]);
                    }

                    $returnValue = '{' . $s . '}';
                }
                break;

            case 'object':
                foreach (get_object_vars($arg) AS $i => $v)
                {
                    $v = $this->encode($v);

                    if (strlen($s) > 0)
                    {
                        $s .= ',';
                    }
                    $s .= $this->encode($i) . ':' . $v;
                }

                $returnValue = '{' . $s . '}';
                break;

            case 'integer':
            case 'double':
                $returnValue = is_numeric($arg) ? (string) $arg : 'null';
                break;

            case 'string':
                $returnValue = '"' . strtr($arg, array(
                    "\r"   => '\\r',    "\n"   => '\\n',    "\t"   => '\\t',     "\b"   => '\\b',
                    "\f"   => '\\f',    '\\'   => '\\\\',   '"'    => '\"',
                    "\x00" => '\u0000', "\x01" => '\u0001', "\x02" => '\u0002', "\x03" => '\u0003',
                    "\x04" => '\u0004', "\x05" => '\u0005', "\x06" => '\u0006', "\x07" => '\u0007',
                    "\x08" => '\b',     "\x0b" => '\u000b', "\x0c" => '\f',     "\x0e" => '\u000e',
                    "\x0f" => '\u000f', "\x10" => '\u0010', "\x11" => '\u0011', "\x12" => '\u0012',
                    "\x13" => '\u0013', "\x14" => '\u0014', "\x15" => '\u0015', "\x16" => '\u0016',
                    "\x17" => '\u0017', "\x18" => '\u0018', "\x19" => '\u0019', "\x1a" => '\u001a',
                    "\x1b" => '\u001b', "\x1c" => '\u001c', "\x1d" => '\u001d', "\x1e" => '\u001e',
                    "\x1f" => '\u001f'
                )) . '"';
                break;

            case 'boolean':
                $returnValue = (string) $arg;
                break;

            default:
                $returnValue = 'null';
        }

        return $returnValue;
    }

    function decode($text,$type=0) // 榛樿