PHP array function realizes editing of association table

This article mainly introduces the editing operations of association tables in PHP based on array functions, involving the related usage skills of PHP array comparison functions array_intersect and array_diff. Friends in need can refer to it. I hope it can help everyone.

The requirement is that when creating a school, you need to add an application, so you create a school application association table. When you edit the school and submit it, the background needs to determine whether the updated application was submitted at the beginning or if there is a new one. Application submission, old applications are deleted, simplified to an array and summarized as follows

$arr1 = array(1, 2, 4, 5, 6, 9); // 学校应用关联表中一开始的数据
$arr2 = array(3, 4, 5, 7, 8);  // 前台更新的数据
/*
两个数组相同的元素，提取不变的元素
Array
(
  [2] => 4
  [3] => 5
)
*/
$arr3 = array_intersect($arr1, $arr2);
print_r($arr3);
/*
两个数组不同的元素，需要删除的
Array
(
  [0] => 1
  [1] => 2
  [4] => 6
  [5] => 9
)
*/
$arr4 = array_diff($arr1, $arr3);
print_r($arr4);
/*
两个数组不同的元素，需要添加的
Array
(
  [0] => 3
  [3] => 7
  [4] => 8
)
*/
$arr5 = array_diff($arr2, $arr3);
print_r($arr5);

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