How to regenerate the key value after deleting the array in php

In PHP, when an array element is deleted, the key value of the element will remain unchanged. For example, if you use the unset() function to delete an element from an array, the element's key will remain in the array until you manually reconstruct the array key.

In some cases, we may need to regenerate the key values ​​of the array. For example, we may want the index in the array to be automatically reset after removing an element to ensure that the key values ​​of the array elements are consecutive. In this case, we can use the array_values() function to remove elements from the array and re-index the key values.

Let's look at a simple example of how to regenerate array key values ​​using PHP:

// 定义一个包含一些元素的数组
$fruits = array("apple", "banana", "orange", "mango");

// 删除数组中的第二个元素
unset($fruits[1]);

// 重新生成数组键值
$fruits = array_values($fruits);

// 打印出新的数组
print_r($fruits);

In the above example, we first define an array containing four elements$fruits. Using the unset() function, we removed the first element "banana" in the array. We then regenerated the keys of the array $fruits using the array_values() function. Finally, we print the new array to the screen using the print_r() function.

The output result is as follows:

Array
(
    [0] => apple
    [1] => orange
    [2] => mango
)

In the above output result, you can see that "banana" has been successfully deleted, and the key value of the new array starts from 0.

When we use the array_values() function, it moves each element in the array passed to it to a new position, thereby generating a new set of consecutive numeric key values ​​starting from Starting at 0 and increasing in the order they appear in the array. If there are any missing keys in the array (for example, when removing elements), the array_values() function also automatically fills in those keys.

It is very useful to regenerate array key values ​​when performing array operations. It helps us clearly understand the structure of the array and ensures that we use the correct index to access the array elements. At the same time, because this operation is also very fast and simple, we can apply it to many PHP projects.

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