PHP将数组转为json出现的中文乱码的问题

// 示例代码
 $testJSON=array('title' => '标题', 'url' => 'meitu.jpg');
    foreach ( $testJSON as $key => $value ) 
    {   
        $testJSON[$key] = urlencode ( $value );   
    }   
  $ret = urldecode ( json_encode ( $testJSON ) );  
   print_r($ret );

// 将GBK转为UTF-8后，再json_decode为数组json_decode($new_url, true)，后边带true参数表示转为数组，否则默认为对象形式的
  $new_url = iconv("GBK","UTF-8//IGNORE",  $ret );
  print_r(json_decode($new_url, true));

<?php
$arr = array(
    array(
         'name' => "周星驰",
         'age' => "23",
         'info' => array(
             'address' => '旺角',
          ),
      ),
     array(
        'name' => "发哥",
        "age" => 25
       ),
);
 
$in_charset   = "gbk";
$out_charset = "utf-8";
function array_iconv($in_charset,$out_charset,$arr){
           return eval('return '.iconv($in_charset,$out_charset,var_export($arr,true).';'));
}  
 
 
 
 $res = array_iconv($in_charset, $out_charset, $arr);
 $res = json_encode($res);
 print_r($res);