PHP自定义递归函数实现数组转JSON功能【支持GBK编

function newArrayToJson($array)
{
  if(!is_array($array))
  {
    return '';
  }
  $func = __FUNCTION__;
  //关键判断是不是关联数组，以此来决定是否需要json加密key和使用[]
  $associative = (array_keys($array) !== range(0, count($array) - 1)) ? true : false;
  if($associative && !empty($array))
  {
    $construct = array();
    foreach($array as $key => $value)
    {
      $key = '"'.$key.'"';
      if(is_array($value))
      {
        $value = $func($value);
      }
      elseif(!is_numeric($value))
      {
        $value = '"'.$value.'"';
      }
      $construct[] = "$key:$value";
    }
    $result = "{".implode(",",$construct)."}";
  }
  else
  {
    $construct = array();
    foreach($array as $value)
    {
      if(is_array($value))
      {
        $value = $func($value);
      }
      else if(!is_numeric($value))
      {
        $value = '"'.$value.'"';
      }
      $construct[] = $value;
    }
    $result = "[".implode(",", $construct)."]";
  }
  return $result;
}

//测试
$arr=array('1'=>'.jb51.','2'=>'.baidu.','3'=>'.sina..','4'=>'狼蚁SEO');
echo newArrayToJson($arr);
/
运行结果
{"1":".jb51.","2":".baidu.","3":".sina..","4":"狼蚁SEO"}
/