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php5.4以上:

json_encode($data, JSON_FORCE_OBJECT | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);

php5.3
//数组转成对象编码,encode后[]变成{}
$data = json_encode($data, JSON_FORCE_OBJECT);
//不转义斜杠
$data = str_replace("\\/", "/", $data);
//以字面编码多字节 Unicode 字符(默认是编码成 \uXXXX)
$data = _unicodeToUTF8($data);
//\u变成多字节Unicode字符
function _unicodeToUTF8($str){
  return preg_replace_callback(\'/\\\\u([0-9a-f]{4})/i\',
  create_function(
    \'$matches\',
    \'return mb_convert_encoding(pack("H*", $matches[1]), "UTF-8", "UCS-2BE");\'
  ), $str);
}

注意:JSON_FORCE_OBJECT //慎用,会把里面所有数组都转换成对象,即[]都会变成{}

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