How to manipulate arrays using PHP built-in functions?

How to use PHP built-in functions to operate arrays

The PHP language has built-in rich functions to easily operate arrays, allowing developers to process them efficiently and management data. This article will introduce common practical cases of using these functions.

Basic array functions

• array_merge(): Merge two or more arrays.
• array_slice(): Extract the specified element from the array.
• array_keys(): Returns all key names in the array.
• array_values(): Returns all key values ​​in the array.

Sort function

• sort(): Sort array elements in ascending order.
• rsort(): Sort array elements in descending order.
• krsort(): Sort the array key names in descending order.

Search function

• array_search(): Searches for a specific value in an array and returns its key name.
• in_array(): Check whether the array contains a specific value.

Practical case:

Merge arrays

$arr1 = [1, 2, 3];
$arr2 = [4, 5, 6];

$merged = array_merge($arr1, $arr2); // 结果： [1, 2, 3, 4, 5, 6]

Extract array elements

$arr = [1, 2, 3, 4, 5];

$slice = array_slice($arr, 2); // 结果： [3, 4, 5]

Sort by key name

$arr = ['name' => 'John', 'age' => 30, 'city' => 'New York'];

krsort($arr); // 结果： ['city' => 'New York', 'age' => 30, 'name' => 'John']

Search array value

$arr = ['apple', 'banana', 'orange'];

$key = array_search('banana', $arr); // 结果： 1

Summary

In this article, we showed you how to use PHP built-in functions to efficiently manipulate arrays. By understanding the use of these functions, developers can save a lot of time and effort in managing and processing data.

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