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PHP array function realizes editing of association table

小云云
小云云Original
2018-02-10 09:57:201512browse

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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