Consistent persistence, PHP’s better solution to data update

1. Mainly used function array_diff_assoc()

a. Syntax:

array_diff_assoc(array1,array2,array3...);

• array1 The first array to compare with other arrays. (Required)

• array2 The array to compare to the first array. (required)

• array3,... The other array to compare with the first array. (Optional)

array_diff_assoc() The function is used to compare the key names and key values ​​of two (or more) arrays and return the difference set. This function compares the keys and values ​​of two (or more) arrays and returns a difference array that includes all elements in the compared array (array1) that are not in any of the other argument arrays (array2 or array3 etc.) in the key name and key value.

b. Example:

<?php
$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
$array2 = array("a" => "green", "yellow", "red");
$result = array_diff_assoc($array1, $array2);
print_r($result);
?>

c. Output:

Array
(
    [b] => brown
    [c] => blue
    [0] => red
)

2 .Actual usage during website development

//对表单数据进行接受
  $id = (int)$_POST['id'];
//通过$id查询相应数据
  $art[]=.............
//通过表单  
  $data[]=..................
//数据比较
$data = array_diff_assoc($data,$art);

//判定
if(!$data){
   //输出无更新
}else{
  //进行更新操作
}

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