Home > Article > Backend Development > PHP8.2 has been released, come and see what changes are there!
PHP8.2 is an important milestone in the modernization process of the PHP language. In addition to exciting new features and improvements, PHP 8.2 also simplifies the language, removes support for dynamic class attributes, issues warnings when certain non-optimal ini configurations are encountered, and fixes a number of fixes that affect PHP Legacy PHP behavior for array sorting and certain types of string conversion/encoding operations. [Recommended learning: PHP video tutorial]
PHP8.2 solves several shortcomings and limitations of the PHP type system, allowing PHP applications adopt better type safety. Including adding the true type, allowing null and false to be used as independent types, and supporting DNF types (generic parsing).
PHP8.2 supports separate paradigm types and can now combine union types and communicative types, which can define parameters, return values and properties with precise and expressive declarations.
Before php8.2
class Foo { public function bar(mixed $entity) { if ((($entity instanceof A) && ($entity instanceof B)) || ($entity === null)) { return $entity; } throw new Exception('Invalid entity'); } }
Now
class Foo { public function bar((A&B)|null $entity) { return $entity; } }
supports
function alwaysReturnsFalse(): false {} function alwaysReturnsNull(): null {} function alwaysReturnsTrue(): true {}
The type
readonly class User { public string $username; public string $uid; }
All attributes will be automatically declared
In the historical development of
, you can use trait Foo
{
public const CONSTANT = 1;
}
class Bar
{
use Foo;
}
var_dump(Bar::CONSTANT); // 1
var_dump(Foo::CONSTANT); // Error
Added a new built-in parameter attribute naming: #[\SensitiveParameter]. Enables
an error occurs, these values will be logged. Displayed on the screen or recorded in the log. So people can get sensitive data through these methods.
function passwordHash(#[\SensitiveParameter] string $password) { debug_print_backtrace(); } passwordHash('hunter2');
The printed content is as follows:
array(1) { [0]=> array(4) { ["file"]=> string(38) "..." ["line"]=> int(9) ["function"]=> string(3) "foo" ["args"]=> array(1) { // [0]=> string(38) "hunter2" 这一行不会被打印出来 [0]=> object(SensitiveParameterValue)#1 (0) {} } } }
解析
将
ini_parse_quantity('256M'); // 268435456
<strong>curl_upkeep</strong>
在
检索密码长度:<strong>openssl_cipher_key_length</strong>
在
openssl_cipher_key_length("CHACHA20-POLY1305"); // 32 openssl_cipher_key_length("AES-128-GCM"); // 16 openssl_cipher_key_length("AES-256-GCM"); // 32
重置记录的峰值内存使用量:<strong>memory_reset_peak_usage</strong>
这对于多次调用或迭代调用时很有用。
PHP8.2也带来了相当一部分的弃用。当语法、函数和特性被弃用时,PHP会发起一个弃用通知,该通知不应该中断PHP程序,但会被记录到错误日志中。
注意:PHP8.0 以后,PHP 的默认错误报告行为是E_ALL
PHP8.2中最值得注意的弃用之一就是弃用动态属性。如果一个类属性没有声明就被调用或赋值,就会退出程序。
class User { public int $uid; } $user = new User(); $user->name = 'Foo';
这个可能会影响到很多的的PHP遗留程序,推荐的修复方法是在类型中声明属性。
对此也有例外用法,比如stdClass和它的子类将正常使用,__get和__set魔术方法将正常使用,或者声明#AllowDynamicProperties。
其他一些弃用可以关注本站其他文章:
《PHP8.2 中字串变量解析的新用法》https://phpreturn.com/index/a628de16a2adf8.html
PHP 8.2现在可以在所有常规源代码中下载/安装:
Windows:编译后的二进制文件可在windows.php.net
Ubuntu/Debian: PHP 8.2可用ondrej/phpPPA
Fedora/RHEL/CentOS/Alma/Rocky:可以在Remi的源中获取
Mac OS: PHP 8.2可以通过Homebrew安装shivammathur/homebrew-php利用.
Docker:可以通过8.2*版本获取PHP 8.2
原文地址:https://phpreturn.com/index/a639285aa925ed.html
原文平台:PHP武器库
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