GBK的页面输出JSON格式的php函数

function tb_json_encode($value, $options = 0) 
{ 
return json_encode(tb_json_convert_encoding($value, “GBK”, “UTF-8″)); 
} 

function tb_json_decode($str, $assoc = false, $depth = 512) 
{ 
return tb_json_convert_encoding(json_decode($str, $assoc), “UTF-8″, “GBK”); 
} 

function tb_json_convert_encoding($m, $from, $to) 
{ 
switch(gettype($m)) { 
case ‘integer': 
case ‘boolean': 
case ‘float': 
case ‘double': 
case ‘NULL': 
return $m; 

case 'string': 
return mb_convert_encoding($m, $to, $from); 
case ‘object': 
$vars = array_keys(get_object_vars($m)); 
foreach($vars as $key) { 
$m->$key = tb_json_convert_encoding($m->$key, $from ,$to); 
} 
return $m; 
case ‘array': 
foreach($m as $k => $v) { 
$m[tb_json_convert_encoding($k, $from, $to)] = tb_json_convert_encoding($v, $from, $to); 
} 
return $m; 
default: 
} 
return $m; 
}