thinkphp5 uses infinitesimal classification

In this paper, we share the specific code of thinkphp5 using infinitesimal classification for your reference. The specific contents are as follows

1. Firstly, the infinite pole classification is completed according to ordinary recursion

2. Add characters according to the level of the semicolon class, store them in the _ name field of the array again, and finally output them according to the _ name field

/**
  *  Get tree data 
  * @param $data  Data 
  * @param $title     Field name in database 
  * @param string $fieldPri   Primary key in database id
  * @param string $fieldPid   Parent in database id
  * @return array
  */
 static public function tree($data, $title, $fieldPri = 'cid', $fieldPid = 'pid')
 {
  if (!is_array($data) || empty($data))
   return array();
  $arr = Data::channelList($data);
  foreach ($arr as $k => $v) {
   $str = "";
   if ($v['_level'] > 2) {
    for ($i = 1; $i < $v['_level'] - 1; $i++) {
     $str .= " The  ";
    }
   }
   if ($v['_level'] != 1) {
    $t = $title ? $v[$title] : "";
    if (isset($arr[$k + 1]) && $arr[$k + 1]['_level'] >= $arr[$k]['_level']) {
     $arr[$k]['_name'] = $str . " -  " . $v['_html'] . $t;
    } else {
     $arr[$k]['_name'] = $str . " Off-  " . $v['_html'] . $t;
    }
   } else {
    $arr[$k]['_name'] = $v[$title];
   }
  }
  // Set the primary key to $fieldPri
  $data = array();
  foreach ($arr as $d) {
   $data[$d[$fieldPri]] = $d;
  }
  return $data;
 }

/**
  *  Get all sub-columns 
  * @param $data  Column data 
  * @param int $pid  Column of operation 
  * @param string $html  Character before column name 
  * @param string $fieldPri  Table primary key 
  * @param string $fieldPid  Father id
  * @param int $level  Rank 
  * @return array
  */
 static public function channelList($data, $pid = 0, $html = " ", $fieldPri = 'cid', $fieldPid = 'pid', $level = 1)
 {
  $data = self::_channelList($data, $pid, $html, $fieldPri, $fieldPid, $level);
  if (empty($data))
   return $data;
 
  foreach ($data as $n => $m) {
   if ($m['_level'] == 1)
    continue;// End a single loop 
   $data[$n]['_first'] = false;
   $data[$n]['_end'] = false;
   if (!isset($data[$n - 1]) || $data[$n - 1]['_level'] != $m['_level']) {
    $data[$n]['_first'] = true; 
   }
   if (isset($data[$n + 1]) && $data[$n]['_level'] > $data[$n + 1]['_level']) {
    $data[$n]['_end'] = true;
   }
  }
  // Update key Is the column primary key 
  $category=array();
  foreach($data as $d){
   $category[$d[$fieldPri]]=$d;
  }
  return $category;
 }

// For only channelList Method uses 
 
 /**
  *  Get all sub-columns 
  * @param $data  Column data 
  * @param int $pid  Column of operation 
  * @param string $html  Character before column name 
  * @param string $fieldPri  Table primary key 
  * @param string $fieldPid  Father id
  * @param int $level  Rank 
  * @return array
  */
 static private function _channelList($data, $pid = 0, $html = " ", $fieldPri = 'cid', $fieldPid = 'pid', $level = 1)
 {
  if (empty($data))
   return array();
  $arr = array();
 
  foreach ($data as $v) {
   $id = $v[$fieldPri];
   if ($v[$fieldPid] == $pid) {
    $v['_level'] = $level;
    $v['_html'] = str_repeat($html, $level - 1);
    $arr[] = $v;
 
    $tmp = self::_channelList($data, $id, $html, $fieldPri, $fieldPid, $level + 1);
    $arr = array_merge($arr, $tmp);//array_merge Combine two arrays into 1 Array of numbers 
   }
  }
  return $arr;
 }