PHP regional classification sorting algorithm example code

This article is a detailed analysis and introduction to the implementation of regional classification sorting algorithm using PHP. Friends who need it can refer to

Write a function to convert the data
$array = array(
0=>array("","Hebei"),
1=>array("","Beijing"),
2=> array(0,"Baoding"),
3=>array(1,"Haidian"),
4=>array(3,"Zhongguancun"),
5=>array( 2,"Zhuozhou")
);
After processing, the return is as follows:
Hebei
-Baoding
--Zhuozhou
Beijing
-Haidian
--Zhongguancun

The code is as follows:

function typeArray($array){ 
        $con = null; 
        foreach ($array as $k=>$v){ 
            $na[$k] = is_numeric($v[0]) ? $na[$v[0]].$k."|" : $k."|"; 
        } 
        asort($na); //排序
        foreach ($na as $k=>$v){ 
          $s = substr_count($v,"|"); 
          $con .= str_repeat("-",($s-1)).$array[$k][1]."\n"; 
        } 
        return $con; 
    }

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