封装json格式化函数

<?php
function indent ($json) {
  $result = '';
  $pos = 0;
  $strLen = strlen($json);
  $indentStr = ' ';
  $newLine = "
";
  $prevChar = '';
  $outOfQuotes = true;

  for ($i=0; $i<=$strLen; $i++) {
      // 抓取字符串中的下一个字符
      $char = substr($json, $i, 1);
      // Are we inside a quoted string?
      if ($char == '"' && $prevChar != '\') {
         $outOfQuotes = !$outOfQuotes;
         // 如果这个字符是元素的结尾，输出新行并缩进下一行
      } else if(($char == '}' || $char == ']') && $outOfQuotes) {
         $result .= $newLine;
         $pos --;
        for ($j=0; $j<$pos; $j++) {
          $result .= $indentStr;
        }
      }
      //将字符添加到结果字符串中
      $result .= $char;
      // 如果最后一个字符是元素的开头,输出新行并缩进下一行
      if (($char == ',' || $char == '{' || $char == '[') && $outOfQuotes) {
        $result .= $newLine;
        if ($char == '{' || $char == '[') {
           $pos ++;
        }
        for ($j = 0; $j < $pos; $j++) {
          $result .= $indentStr;
        }
      }
      $prevChar = $char;
  }
  return $result;
}

$arr = array(  
    'status' => true,  
    'errMsg' => '',  
    'member' =>array(  
        array(  
            'name' => '李逍遥',  
            'gender' => '男'  
        ),  
        array(  
            'name' => '赵灵儿',  
            'gender' => '女'  
        )  
    )  
); 
$str = json_encode($arr);
$json = indent($str);
echo $json;