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@ 2018-06-03T01:54:14Z

<?php

$arr = [
  0=>['id'=>1,'name'=>'父1','father'=>0],
  1=>['id'=>2,'name'=>'父2','father'=>0],
  2=>['id'=>3,'name'=>'父3','father'=>0],
  3=>['id'=>4,'name'=>'儿1-1','father'=>1],
  4=>['id'=>5,'name'=>'儿1-2','father'=>1],
  5=>['id'=>6,'name'=>'儿1-3','father'=>1],
  6=>['id'=>7,'name'=>'儿2-1','father'=>2],
  7=>['id'=>8,'name'=>'儿2-1','father'=>2],
  8=>['id'=>9,'name'=>'儿3-1','father'=>3],
  9=>['id'=>10,'name'=>'儿3-1-1','father'=>9],
  10=>['id'=>11,'name'=>'儿1-1-1','father'=>4],
  11=>['id'=>12,'name'=>'儿2-1-1','father'=>7],
];
function generateTree($arr,$id,$step){
  static $tree=[];
  foreach($arr as $key=>$val) {
    if($val['father'] == $id) {
      $flg = str_repeat('└―',$step);
      $val[$val['id']] = $flg.$val['name'];
      $tree[] = $val;
      generateTree($arr , $val['id'] ,$step+1);
    }
  }
  return $tree;
}
$tree = generateTree($arr,0,0);
foreach ($tree as $val){
  $new[] = $val['name'].'<br>';
}

print_r($new);

Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Array ( [0] => 父1<br> [1] => 儿1-1<br> [2] => 儿1-1-1<br> [3] => 儿1-2<br> [4] => 儿1-3<br> [5] => 父2<br> [6] => 儿2-1<br> [7] => 儿2-1-1<br> [8] => 儿2-1<br> [9] => 父3<br> [10] => 儿3-1<br> [11] => 儿3-1-1<br> )
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [0] => 父1<br> [1] => 儿1-1<br> [2] => 儿1-1-1<br> [3] => 儿1-2<br> [4] => 儿1-3<br> [5] => 父2<br> [6] => 儿2-1<br> [7] => 儿2-1-1<br> [8] => 儿2-1<br> [9] => 父3<br> [10] => 儿3-1<br> [11] => 儿3-1-1<br> )

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