PHP development classification technology uses recursion to achieve infinite classification (2)

We continue to use the previous section to create a simple database test and table class

Connect to the database table:

<?php
header("content-type:text/html;charset=utf8");

$link = mysqli_connect('localhost','yourname','password','test');
mysqli_set_charset($link, "utf8");
if (!$link) {
  die("连接失败:".mysqli_connect_error());
}
?>

Define a custom function get_array, the idea is basically the same as the previous section

Set the parent class pid = 0, use SQL statements to query its subclasses, and place the queried subclasses in $result

Use a while loop to get the subclasses, Call the custom function get_array, pass the id of the subclass into the custom function,

then continue to query the next level, and finally output the array.

<?php
header("content-type:text/html;charset=utf8");

$link = mysqli_connect('localhost','yourname','password','test');
mysqli_set_charset($link, "utf8");
if (!$link) {
  die("连接失败:".mysqli_connect_error());
}

function get_array($id=0){
  global $link;
  $sql = "select id,title from class where pid= $id";
  $result = mysqli_query($link,$sql);;//查询子类
  $arr = array();
  if($result){//如果有子类
    while($rows=mysqli_fetch_assoc($result)){ //循环记录集
      $rows['list'] = get_array($rows['id']); //调用函数，传入参数，继续查询下级
      $arr[] = $rows; //组合数组
    }
    return $arr;
  }
}
$list = get_array(0); //调用函数
print_r($list); //输出数组
?>