如何将YII的CJSON重写为WJSON，实现model输出并支持自定义变量？

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重写YII的CJSON为WJSON，支持输出model的自定义变量。由于YII的CJSON输出model时只能输出attributes变量，不能输出自定义变量，因此重写此类，使其可以输出自定义变量。示例代码如下：

php/** * @author 王亚超 */class WJSON extends CJSON{ public function encode($data) { // 获取model的类名 $className=get_class($data); // 获取model的属性 $attributes=$data->attributes; // 获取model的自定义变量 $customVars=$data->getCustomVars();

// 合并属性和自定义变量 $result=array_merge($attributes, $customVars);

// 返回JSON字符串 return json_encode($result); }}

使用方法：php// 创建一个model实例$model=new YourModel();

// 获取自定义变量$customVars=$model->getCustomVars();

// 创建WJSON实例$wjson=new WJSON();

// 编码model$jsonString=$wjson->encode($model);

// 输出JSON字符串echo $jsonString;

重写YII的CJSON为WJSON输出model支持自定义变量
因YII的CJSON输出model时只能输出attributes变量，不能输出自定义变量，重新此类使之可以输出自定义变量

<?php /** * @author 王亚超 * 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 .= '\\b'; break; case $ord_var_c == 0x09: $ascii .= '\\t'; break; case $ord_var_c == 0x0A: $ascii .= '\\n'; break; case $ord_var_c == 0x0C: $ascii .= '\\f'; break; case $ord_var_c == 0x0D: $ascii .= '\\r'; 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 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 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 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 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 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 ''; } } }