A Look at What's Coming to PHP 8.4 [ 技术分享 ]

PHP 8.4 is coming soon and in this post let's look at what has been announced so far, and what new features you might expect.

When is PHP 8.4 scheduled to be released?

PHP 8.4 is scheduled to be released on November 21, 2024. Before the release it will feature 6 months of pre-release phases going from Alphas, to Betas, to Release Candidates, and then the official release.

New Array Find Functions

PHP 8.4 will come with new array find functions that include:

• array_find()
• array_find_key()
• array_any()
• array_all()

See our post on the PHP 8.4 Array Find Functions

PHP Property Hooks

Property hooks are inspired by languages like Kotlin, C#, and Swift, and the syntax includes two syntax variants that resemble short and multi-line closures:

class User implements Named
{
    private bool $isModified = false;
 
    public function __construct(
        private string $first,
        private string $last
    ) {}
 
    public string $fullName {
        // Override the "read" action with arbitrary logic.
        get => $this->first . " " . $this->last;
 
        // Override the "write" action with arbitrary logic.
        set {
            [$this->first, $this->last] = explode(' ', $value, 2);
            $this->isModified = true;
        }
    }
}

Property hooks will help remove boilerplate of property getters and setters, allowing a property to define access and updates using hooks.

Check out our post for more details: Property Hooks in PHP 8.4.

new MyClass()->method() without parentheses

Since member access during instantiation was introduced, you must wrap the new MyClass() call in parentheses, or you'll get a parse error. The proposed syntax would allow you to access constants, properties, and methods without the extra parentheses:

// Wrapping parentheses are required to access class members
$request = (new Request())->withMethod('GET')->withUri('/hello-world');
 
// PHP Parse error (<= PHP 8.3): syntax error, unexpected token "->"
$request = new Request()->withMethod('GET')->withUri('/hello-world');

This update fixes papercut that makes working with class member access simpler, not having to add surrounding parentheses or using a static constructor method. This syntax change also puts PHP more in alignment with other C languages like Java, C#, and TypeScript, which don't require surrounded parentheses.

Check out our post for more details: Class Instantiation Without Extra Parenthesis in PHP 8.4.

Create a DateTime from a Unix Timestamp

Creating a DateTime from a Unix timestamp will be more convenient in PHP 8.4, with the new createFromTimestamp() method. It will support both a typical Unix timestamp as well as timestamps containing microseconds:

$dt = DateTimeImmutable::createFromTimestamp(1718337072);
$dt->format('Y-m-d'); // 2024-06-14
 
$dt = DateTimeImmutable::createFromTimestamp(1718337072.432);
$dt->format('Y-m-d h:i:s.u'); // 2024-06-14 03:51:12.432000

In earlier versions of PHP, there are a few ways to create a DateTime instance from a timestamp, such as the createFromFormat() method:

$dt = DateTimeImmutable::createFromFormat('U', (string) 1718337072);
// DateTimeImmutable @1718337072 {#7948
//   date: 2024-06-14 03:51:12.0 +00:00,
// }
 
$dt = DateTimeImmutable::createFromFormat('U.u', (string) 1718337072.432);
// DateTimeImmutable @1718337072 {#7950
//   date: 2024-06-14 03:51:12.432 +00:00,
// }

New mb_ functions

PHP has had trim, ltrim, rtrim, ucfirst, and lcfirst functions for a long time, and now in PHP 8.4 it adds mb_, multi-byte strings support for those functions.

• mb_trim
• mb_ltrim
• mb_rtrim
• mb_ucfirst
• mb_lcfirst

These all carry the same arguments as the original functions.

原文：https://laravel-news.com/php-8-4-0