class Locale
{
private string $languageCode;
private string $countryCode;
public function __construct(string $languageCode, string $countryCode)
{
$this->setLanguageCode($languageCode);
$this->setCountryCode($countryCode);
}
public function getLanguageCode(): string
{
return $this->languageCode;
}
public function setLanguageCode(string $languageCode): void
{
$this->languageCode = $languageCode;
}
public function getCountryCode(): string
{
return $this->countryCode;
}
public function setCountryCode(string $countryCode): void
{
$this->countryCode = strtoupper($countryCode);
}
public function setCombinedCode(string $combinedCode): void
{
[$languageCode, $countryCode] = explode('_', $combinedCode, 2);
$this->setLanguageCode($languageCode);
$this->setCountryCode($countryCode);
}
public function getCombinedCode(): string
{
return \sprintf("%s_%s", $this->languageCode, $this->countryCode);
}
}
$brazilianPortuguese = new Locale('pt', 'br');
var_dump($brazilianPortuguese->getCountryCode()); // BR
var_dump($brazilianPortuguese->getCombinedCode()); // pt_BR
class Locale
{
public string $languageCode;
public string $countryCode
{
set (string $countryCode) {
$this->countryCode = strtoupper($countryCode);
}
}
public string $combinedCode
{
get => \sprintf("%s_%s", $this->languageCode, $this->countryCode);
set (string $value) {
[$this->languageCode, $this->countryCode] = explode('_', $value, 2);
}
}
public function __construct(string $languageCode, string $countryCode)
{
$this->languageCode = $languageCode;
$this->countryCode = $countryCode;
}
}
$brazilianPortuguese = new Locale('pt', 'br');
var_dump($brazilianPortuguese->countryCode); // BR
var_dump($brazilianPortuguese->combinedCode); // pt_BR
class PhpVersion
{
private string $version = '8.3';
public function getVersion(): string
{
return $this->version;
}
public function increment(): void
{
[$major, $minor] = explode('.', $this->version);
$minor++;
$this->version = "{$major}.{$minor}";
}
}
class PhpVersion
{
public private(set) string $version = '8.4';
public function increment(): void
{
[$major, $minor] = explode('.', $this->version);
$minor++;
$this->version = "{$major}.{$minor}";
}
}
#[\Deprecated]
属性 RFC
文档
class PhpVersion
{
/**
* @deprecated 8.3 use PhpVersion::getVersion() instead
*/
public function getPhpVersion(): string
{
return $this->getVersion();
}
public function getVersion(): string
{
return '8.3';
}
}
$phpVersion = new PhpVersion();
// No indication that the method is deprecated.
echo $phpVersion->getPhpVersion();
class PhpVersion
{
#[\Deprecated(
message: "use PhpVersion::getVersion() instead",
since: "8.4",
)]
public function getPhpVersion(): string
{
return $this->getVersion();
}
public function getVersion(): string
{
return '8.4';
}
}
$phpVersion = new PhpVersion();
// Deprecated: Method PhpVersion::getPhpVersion() is deprecated since 8.4, use PhpVersion::getVersion() instead
echo $phpVersion->getPhpVersion();
#[\Deprecated]
属性使 PHP 的现有弃用机制可用于用户定义的函数、方法和类常量。 $dom = new DOMDocument();
$dom->loadHTML(
<<<'HTML'
<main>
<article>PHP 8.4 is a feature-rich release!</article>
<article class="featured">PHP 8.4 adds new DOM classes that are spec-compliant, keeping the old ones for compatibility.</article>
</main>
HTML,
LIBXML_NOERROR,
);
$xpath = new DOMXPath($dom);
$node = $xpath->query(".//main/article[not(following-sibling::*)]")[0];
$classes = explode(" ", $node->className); // Simplified
var_dump(in_array("featured", $classes)); // bool(true)
$dom = Dom\HTMLDocument::createFromString(
<<<'HTML'
<main>
<article>PHP 8.4 is a feature-rich release!</article>
<article class="featured">PHP 8.4 adds new DOM classes that are spec-compliant, keeping the old ones for compatibility.</article>
</main>
HTML,
LIBXML_NOERROR,
);
$node = $dom->querySelector('main > article:last-child');
var_dump($node->classList->contains("featured")); // bool(true)
新的 DOM API 包括符合标准的支持,用于解析 HTML5 文档,修复了 DOM 功能行为中的几个长期存在的规范性错误,并添加了几个函数,使处理文档更加方便。
新的 DOM API 可以在 Dom
命名空间中使用。使用新的 DOM API 可以使用 Dom\HTMLDocument
和 Dom\XMLDocument
类创建文档。
$num1 = '0.12345';
$num2 = 2;
$result = bcadd($num1, $num2, 5);
echo $result; // '2.12345'
var_dump(bccomp($num1, $num2) > 0); // false
use BcMath\Number;
$num1 = new Number('0.12345');
$num2 = new Number('2');
$result = $num1 + $num2;
echo $result; // '2.12345'
var_dump($num1 > $num2); // false
新的 BcMath\Number
对象使在处理任意精度数字时可以使用面向对象的方式和标准的数学运算符。
这些对象是不可变的,并实现了 Stringable
接口,因此可以在字符串上下文中使用,如 echo $num
。
array_*()
函数 RFC
$animal = null;
foreach (['dog', 'cat', 'cow', 'duck', 'goose'] as $value) {
if (str_starts_with($value, 'c')) {
$animal = $value;
break;
}
}
var_dump($animal); // string(3) "cat"
$animal = array_find(
['dog', 'cat', 'cow', 'duck', 'goose'],
static fn (string $value): bool => str_starts_with($value, 'c'),
);
var_dump($animal); // string(3) "cat"
$connection = new PDO(
'sqlite:foo.db',
$username,
$password,
); // object(PDO)
$connection->sqliteCreateFunction(
'prepend_php',
static fn ($string) => "PHP {$string}",
);
$connection->query('SELECT prepend_php(version) FROM php');
$connection = PDO::connect(
'sqlite:foo.db',
$username,
$password,
); // object(Pdo\Sqlite)
$connection->createFunction(
'prepend_php',
static fn ($string) => "PHP {$string}",
); // Does not exist on a mismatching driver.
$connection->query('SELECT prepend_php(version) FROM php');
Pdo\Dblib
、Pdo\Firebird
、Pdo\MySql
、Pdo\Odbc
、Pdo\Pgsql
和 Pdo\Sqlite
的子类可用。 new MyClass()->method()
不需要括号 RFC
文档
class PhpVersion
{
public function getVersion(): string
{
return 'PHP 8.3';
}
}
var_dump((new PhpVersion())->getVersion());
class PhpVersion
{
public function getVersion(): string
{
return 'PHP 8.4';
}
}
var_dump(new PhpVersion()->getVersion());
new
表达式的情况下访问新实例化对象的属性和方法。 request_parse_body()
函数。bcceil()
、bcdivmod()
、bcfloor()
和 bcround()
函数。RoundingMode
枚举用于 round()
,包括 4 个新的舍入模式 TowardsZero
、AwayFromZero
、NegativeInfinity
和 PositiveInfinity
。DateTime::createFromTimestamp()
、DateTime::getMicrosecond()
、DateTime::setMicrosecond()
、DateTimeImmutable::createFromTimestamp()
、DateTimeImmutable::getMicrosecond()
和 DateTimeImmutable::setMicrosecond()
方法。mb_trim()
、mb_ltrim()
、mb_rtrim()
、mb_ucfirst()
和 mb_lcfirst()
函数。pcntl_getcpu()
、pcntl_getcpuaffinity()
、pcntl_getqos_class()
、pcntl_setns()
和 pcntl_waitid()
函数。ReflectionClassConstant::isDeprecated()
、ReflectionGenerator::isClosed()
和 ReflectionProperty::isDynamic()
方法。http_get_last_response_headers()
、http_clear_last_response_headers()
和 fpow()
函数。XMLReader::fromStream()
、XMLReader::fromUri()
、XMLReader::fromString()
、XMLWriter::toStream()
、XMLWriter::toUri()
和 XMLWriter::toMemory()
方法。grapheme_str_split()
函数。_
作为类名现已弃用。round()
传递无效模式将抛出 ValueError
。date
、intl
、pdo
、reflection
、spl
、sqlite
、xmlreader
的类常量现在是有类型的。GMP
类现已是 final 类。MYSQLI_SET_CHARSET_DIR
、MYSQLI_STMT_ATTR_PREFETCH_ROWS
、MYSQLI_CURSOR_TYPE_FOR_UPDATE
、MYSQLI_CURSOR_TYPE_SCROLLABLE
和 MYSQLI_TYPE_INTERVAL
常量。mysqli_ping()
、mysqli_kill()
、mysqli_refresh()
函数,mysqli::ping()
、mysqli::kill()
、mysqli::refresh()
方法,以及 MYSQLI_REFRESH_*
常量。stream_bucket_make_writeable()
和 stream_bucket_new()
现在返回 StreamBucket
实例而不是 stdClass
。exit()
行为变更。E_STRICT
常量已弃用。