php delete array attribute value

When using PHP to perform array operations, sometimes we need to delete a certain attribute value of the array in order to achieve the purpose of our operation. This article explains how to delete attribute values ​​from an array using PHP.

Method 1: Use the unset() function
The unset() function can destroy the specified variables, including key-value pairs in the array. For example, we have the following array:

$students = array(
"小明" => "A",
"小红" => "B",
"小Just" => "C"
);

Now we want to delete Xiaohong's grades in the array, we can use the unset() function:

unset($students["小红Red"]);

It is very simple to use the unset() function to delete an attribute value in the array. You only need to use the key name to be deleted as the parameter of the unset() function.

Method 2: Use array_diff() function
array_diff() function can compare two or more arrays and return a difference array, that is, return elements that only exist in the first array . For example, we have the following two arrays:

$nums1 = array(1, 2, 3, 4, 5);
$nums2 = array(4, 5, 6, 7, 8);

If we want to keep the elements in the $nums1 array and delete the elements in the $nums2 array, we can use the array_diff() function:

$nums3 = array_diff($nums1, $nums2 );

In this way, the $nums3 array only contains the elements in the $nums1 array, and the elements in the $nums2 array are deleted.

To use the array_diff() function to delete an attribute value in an array, you need to use the attribute value to be deleted, that is, an element of the array, as an element of another array, and then pass the original array and the new array as parameters. Enter the array_diff() function. For example, we have the following array:

$students = array(
"小明" => "A",
"小红" => "B",
"小Just" => "C"
);

If we want to delete Xiaohong's grades, we can first use Xiaohong's grades as a new array element:

$remove = array("小红" => "B");

Then use the array_diff() function to delete:

$students = array_diff($students, $remove);

In this way, the little red in the $students array has been deleted.

Summary
Both of the above methods can delete arrays, but using the unset() function is simpler and clearer than the array_diff() function. Of course, in some special cases, using the array_diff() function will be more practical. Either method can help us quickly delete an attribute value in the array.

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