重写YII的CJSON为WJSON输出model支持自定义变量

<?php
 
/**
 * @author PHP中文网
 * 重写YII的CJSON为WJSON输出model支持自定义变量
 * Class WJSON
 */
class WJSON extends CJSON {
    protected static function nameValue($name, $value) {
        return self::encode(strval($name)) . ':' . self::encode($value);
    }
 
    public static function encode($var) {
        switch (gettype($var)) {
            case 'boolean':
                return $var ? 'true' : 'false';
 
            case 'NULL':
                return 'null';
 
            case 'integer':
                return (int)$var;
 
            case 'double':
            case 'float':
                return str_replace(',', '.', (float)$var); // locale-independent representation
 
            case 'string':
                if (($enc = strtoupper(Yii::app()->charset)) !== 'UTF-8')
                    $var = iconv($enc, 'UTF-8', $var);
 
                if (function_exists('json_encode'))
                    return json_encode($var);
 
                // STRINGS ARE EXPECTED TO BE IN ASCII OR UTF-8 FORMAT
                $ascii = '';
                $strlen_var = strlen($var);
 
                /*
                 * Iterate over every character in the string,
                 * escaping with a slash or encoding to UTF-8 where necessary
                 */
                for ($c = 0; $c < $strlen_var; ++$c) {
 
                    $ord_var_c = ord($var{$c});
 
                    switch (true) {
                        case $ord_var_c == 0x08:
                            $ascii .= '';
                            break;
                        case $ord_var_c == 0x09:
                            $ascii .= '	';
                            break;
                        case $ord_var_c == 0x0A:
                            $ascii .= '
';
                            break;
                        case $ord_var_c == 0x0C:
                            $ascii .= '';
                            break;
                        case $ord_var_c == 0x0D:
                            $ascii .= '
';
                            break;
 
                        case $ord_var_c == 0x22:
                        case $ord_var_c == 0x2F:
                        case $ord_var_c == 0x5C:
                            // double quote, slash, slosh
                            $ascii .= '\' . $var{$c};
                            break;
 
                        case (($ord_var_c >= 0x20) && ($ord_var_c <= 0x7F)):
                            // characters U-00000000 - U-0000007F (same as ASCII)
                            $ascii .= $var{$c};
                            break;
 
                        case (($ord_var_c & 0xE0) == 0xC0):
                            // characters U-00000080 - U-000007FF, mask 110XXXXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c, ord($var{$c + 1}));
                            $c += 1;
                            $utf16 = self::utf8ToUTF16BE($char);
                            $ascii .= sprintf('u%04s', bin2hex($utf16));
                            break;
 
                        case (($ord_var_c & 0xF0) == 0xE0):
                            // characters U-00000800 - U-0000FFFF, mask 1110XXXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                ord($var{$c + 1}),
                                ord($var{$c + 2}));
                            $c += 2;
                            $utf16 = self::utf8ToUTF16BE($char);
                            $ascii .= sprintf('u%04s', bin2hex($utf16));
                            break;
 
                        case (($ord_var_c & 0xF8) == 0xF0):
                            // characters U-00010000 - U-001FFFFF, mask 11110XXX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                ord($var{$c + 1}),
                                ord($var{$c + 2}),
                                ord($var{$c + 3}));
                            $c += 3;
                            $utf16 = self::utf8ToUTF16BE($char);
                            $ascii .= sprintf('u%04s', bin2hex($utf16));
                            break;
 
                        case (($ord_var_c & 0xFC) == 0xF8):
                            // characters U-00200000 - U-03FFFFFF, mask 111110XX
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                ord($var{$c + 1}),
                                ord($var{$c + 2}),
                                ord($var{$c + 3}),
                                ord($var{$c + 4}));
                            $c += 4;
                            $utf16 = self::utf8ToUTF16BE($char);
                            $ascii .= sprintf('u%04s', bin2hex($utf16));
                            break;
 
                        case (($ord_var_c & 0xFE) == 0xFC):
                            // characters U-04000000 - U-7FFFFFFF, mask 1111110X
                            // see http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
                            $char = pack('C*', $ord_var_c,
                                ord($var{$c + 1}),
                                ord($var{$c + 2}),
                                ord($var{$c + 3}),
                                ord($var{$c + 4}),
                                ord($var{$c + 5}));
                            $c += 5;
                            $utf16 = self::utf8ToUTF16BE($char);
                            $ascii .= sprintf('u%04s', bin2hex($utf16));
                            break;
                    }
                }
 
                return '"' . $ascii . '"';
 
            case 'array':
 
                // treat as a JSON object
                if (is_array($var) && count($var) && (array_keys($var) !== range(0, sizeof($var) - 1))) {
                    return '{' .
                    join(',', array_map(array('WJSON', 'nameValue'),
                        array_keys($var),
                        array_values($var)))
                    . '}';
                }
 
                // treat it like a regular array
                return '[' . join(',', array_map(array('WJSON', 'encode'), $var)) . ']';
 
            case 'object':
                if ($var instanceof Traversable) {
                    $vars = array();
                    foreach ($var as $k => $v)
                        $vars[$k] = $v;
                } else
                    $vars = get_object_vars($var);
 
                // related
                foreach ($var->relations() as $key => $related) {
                    if ($var->hasRelated($key)) {
                        $vars[$key] = $var->$key;
                    }
                }
 
                return '{' .
                join(',', array_map(array('WJSON', 'nameValue'),
                    array_keys($vars),
                    array_values($vars)))
                . '}';
 
            default:
                return '';
        }
    }
 
}