How to add value to an array in php and return the latest key

Steps: 1. Use array_splice() to insert new elements into the array, the syntax is "array_splice(original array, insertion position, 0, new element)"; 2. Use array_diff() to compare the original array and the added value The new array after, the syntax "array_diff (new array after value-added, original array)" will return a difference array containing different elements; 3. Use array_keys() to get all the key names of the difference array, the syntax " array_keys (difference array)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In PHP, you can use array_diff () and array_keys() functions get the latest key (key name) after adding value to the array.

For example: We have such an array:

$arr=array(10,12,20);

We use the array_splice() function to insert new elements into the array.

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=$arr2=array(10,12,20);
echo "原数组：";
var_dump($arr2);
array_splice($arr2,2,0,array("1",25,"3"));
echo "插入新元素后：";
var_dump($arr2);
?>

Then use array_diff() to compare the original array and the processed array, and return a difference array containing different elements

echo "差集数组：";
$result=array_diff($arr2,$arr1);
var_dump($result);

Finally, use the array_keys() function to obtain all the key names of the difference array.

Recommended learning: "PHP Video Tutorial"

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