search
HomeBackend DevelopmentPHP7How to use PHP7's null coalescing operator to simplify the logical judgment of the code?

How to use PHP7's null coalescing operator to simplify the logical judgment of the code?

Oct 21, 2023 am 11:57 AM
phpSimplify the codenull coalescing operator

How to use PHP7s null coalescing operator to simplify the logical judgment of the code?

How to use PHP7's null coalescing operator to simplify the logical judgment of the code?

A new operator is introduced in PHP7, the null coalescing operator (??), which can reduce tedious logical judgments in the code. By using the null coalescing operator, we can simplify the judgment of whether a variable is null, thereby simplifying the code logic and improving the readability and maintainability of the code.

In previous versions, we often needed to use the ternary operator to determine whether a variable is null, and then perform different operations based on the determination result. For example, if we need to get the user's name from the database, we usually write the code like this:

$name = isset($user['name']) ? $user['name'] : 'Unknown';

This way of writing is not only verbose, but also causes the code to be less readable and difficult to maintain when judged multiple times. . In PHP7, we can use the null coalescing operator to simplify this judgment process. The code is as follows:

$name = $user['name'] ?? 'Unknown';

In this example, if $user['name'] exists and is not null, then $name Will be assigned the value of $user['name']; if $user['name'] is null, then $name will be assigned the value 'Unknown'. As you can see, the same functionality can be achieved more concisely using the null coalescing operator.

In addition to simplifying the judgment of whether a variable is null, the null coalescing operator can also handle the judgment of multiple variables. Let's say we need to get the username from the user's input form, but if the user doesn't enter a username, we use the default username. In the previous writing method, we need to separately determine whether the user input and default user name exist, and then perform different operations according to different situations:

$username = isset($_POST['username']) ? $_POST['username'] : 'DefaultUser';

In PHP7, we can use the null merge operator to simplify The code for this judgment process is as follows:

$username = $_POST['username'] ?? 'DefaultUser';

Similarly, if $_POST['username'] exists and is not null, then $username will be assigned the value of $_POST['username']; if $ _POST['username'] is null, then $username will be assigned the value 'DefaultUser'. Using the null coalescing operator can make the code more concise and clear.

Also note that the null coalescing operator will only return the value on the right when the operand on the left is null. If the left-hand operand exists but its value is an empty string or 0, the null coalescing operator returns the left-hand value instead of the right-hand value. Therefore, when using the null coalescing operator, you need to pay attention to the judgment of the left operand.

To sum up, PHP7’s null coalescing operator is a very convenient tool that can simplify tedious logical judgments in the code. By using the null coalescing operator, we can more concisely determine whether a variable is null, and can also handle the determination of multiple variables. In actual development, rational use of the null coalescing operator can improve the readability and maintainability of the code, making the code more concise and clear.

The above is the detailed content of How to use PHP7's null coalescing operator to simplify the logical judgment of the code?. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Atom editor mac version download

Atom editor mac version download

The most popular open source editor