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PHP 8.4是PHP語(yǔ)言的主要更新。
它包含許多新功能，例如屬性鉤，不對(duì)稱的可見(jiàn)性，更新的DOM API，性能改進(jìn)，錯(cuò)誤修復(fù)和一般清理。
現(xiàn)在升級(jí)到PHP 8.4！屬性鉤
PHP < 8.4
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
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
PHP 8.4
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
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
屬性掛鉤為計(jì)算屬性提供了支持，這些屬性可以通過(guò)IDE和靜態(tài)分析工具本地理解，而無(wú)需編寫(xiě)可能失去同步的DocBlock評(píng)論。此外，它們?cè)试S對(duì)值的可靠預(yù)或后處理，而無(wú)需檢查班級(jí)中是否存在匹配的Getter或Setter。
不對(duì)稱的可見(jiàn)性
PHP < 8.4
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}" ;
}
}
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}" ;
}
}
PHP 8.4
class
PhpVersion
{
public private(set) string $version = '8.4' ;
public function increment(): void {
[ $major, $minor ] = explode( '.', $this->version );
$minor++;
$this->version = "{$major}.{$minor}" ;
}
}
public private(set) string $version = '8.4' ;
public function increment(): void {
[ $major, $minor ] = explode( '.', $this->version );
$minor++;
$this->version = "{$major}.{$minor}" ;
}
}
現(xiàn)在可以獨(dú)立于讀取屬性的范圍來(lái)控制到屬性的范圍，從而減少了對(duì)樣板getter方法的需求，以公開(kāi)屬性的值，而不允許從類的外部進(jìn)行修改。
#[\Deprecated] 屬性
PHP < 8.4
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();
/**
* @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();
PHP 8.4
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(
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();
The new #[Deprecated] attribute makes PHP’s existing deprecation mechanism available to user-defined functions, methods, and class constants.
新的Ext-DOM功能和HTML5支持
PHP < 8.4
$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->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)
PHP 8.4
$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)
<<<'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)
包括符合標(biāo)準(zhǔn)支持HTML5文檔的符合標(biāo)準(zhǔn)支持的新DOM API，在DOM功能的行為中修復(fù)了幾個(gè)長(zhǎng)期存在的合規(guī)性錯(cuò)誤，并添加了多個(gè)功能，以使使用文檔更方便。
新的DOM API可在DOM名稱空間內(nèi)使用。可以使用Domhtmldocument和DomxMldocument類創(chuàng)建使用新DOM API的文檔。
BCMATH的對(duì)象API
PHP < 8.4
$num1
=
'0.12345';
$num2 = '2';
$result = bcadd($num1, $num2, 5);
echo $result; // '2.12345'
var_dump(bccomp($num1, $num2) > 0); // false
$num2 = '2';
$result = bcadd($num1, $num2, 5);
echo $result; // '2.12345'
var_dump(bccomp($num1, $num2) > 0); // false
PHP 8.4
use
BcMath\Number;
$num1 = new Number('0.12345');
$num2 = new Number('2');
$result = $num1 + $num2;
echo $result; // '2.12345'
var_dump($num1 > $num2); // false
$num1 = new Number('0.12345');
$num2 = new Number('2');
$result = $num1 + $num2;
echo $result; // '2.12345'
var_dump($num1 > $num2); // false
使用任意精度數(shù)字時(shí)，新的BCMATHNUMBER對(duì)象可以啟用面向?qū)ο蟮挠梅ê蜆?biāo)準(zhǔn)數(shù)學(xué)運(yùn)算符。
這些對(duì)象是不可變的，并實(shí)現(xiàn)了可弦樂(lè)接口，因此可以在Echo $ num等字符串上下文中使用它們。
New array_*() functions
PHP < 8.4
$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"
foreach ( [ 'dog', 'cat', 'cow', 'duck', 'goose' ] as $value ) {
if ( str_starts_with($value, 'c') ) {
$animal = $value;
break;
}
}
var_dump($animal); // string(3) "cat"
PHP 8.4
$animal
=
array_find(
[ 'dog', 'cat', 'cow', 'duck', 'goose' ],
static fn (string $value): bool => str_starts_with($value, 'c'),
);
var_dump($animal); // string(3) "cat"
[ 'dog', 'cat', 'cow', 'duck', 'goose' ],
static fn (string $value): bool => str_starts_with($value, 'c'),
);
var_dump($animal); // string(3) "cat"
新功能array_find（），array_find_key（），array_any（）和array_all（）可用。
PDO驅(qū)動(dòng)程序特定子類
PHP < 8.4
$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');
'sqlite:foo.db',
$username,
$password,
); // object(PDO)
$connection->sqliteCreateFunction(
'prepend_php',
static fn ($string) => "PHP {$string}",
);
$connection->query('SELECT prepend_php(version) FROM php');
PHP 8.4
$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');
'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');
可以提供新的子類Pdodblib，Pdofirebird，PdomySQL，PDOODBC，PDOPGSQL和PDO的PDOSQLITE。
new MyClass()->method()沒(méi)有括號(hào)
PHP < 8.4
class
PhpVersion
{
public function getVersion(): string {
return 'PHP 8.4';
}
}
var_dump(( new PhpVersion())->getVersion());
public function getVersion(): string {
return 'PHP 8.4';
}
}
var_dump(( new PhpVersion())->getVersion());
PHP 8.4
class
PhpVersion
{
public function getVersion(): string {
return 'PHP 8.4';
}
}
var_dump(new PhpVersion()->getVersion());
public function getVersion(): string {
return 'PHP 8.4';
}
}
var_dump(new PhpVersion()->getVersion());
現(xiàn)在可以訪問(wèn)新實(shí)例化對(duì)象的屬性和方法，而無(wú)需將新表達(dá)式包裹在括號(hào)中。
新增類、接口和函數(shù)
- 新的懶惰對(duì)象。
- 基于IR框架的新JIT實(shí)施。
- 新request_parse_body（）函數(shù)。
- New bcceil(),>bcdivmod(),bcfloor(), and bcround() functions.
- New RoundingMode enum for round() with 4 new rounding modes TowardsZero,AwayFromZero, NegativeInfinity,and PositiveInfinity.
- new DateTime :: createfromtimestamp（），dateTime :: getmicrosecond（），dateTime :: setmicrosecond（），dateTimeImmutable :: createfromtimestamp（），dateTimeImmutable（），dateTimeImmutable（）
- new mb_trim（），mb_ltrim（），mb_rtrim（），mb_ucfirst（）和mb_lcfirst（）函數(shù)。
- new PCNTL_GETCPU（），PCNTL_GETCPUAFFINITY（），PCNTL_GETQOS_CLASS（），PCNTL_SETNS（）和PCNTL_WAITID（）函數(shù)。
- 新的ReflectionClassConstant :: ISDepRecated（），ReflectionGenerator :: isClosed（）和ReflectionProperty :: Isdynamic（）方法。
- 新的HTTP_GET_LAST_RESPONSE_HEADERS（），http_clear_last_response_headers（）和fpow（）函數(shù)。
- 新的XMLReader :: Fromstream（），XmlReader :: Fromuri（），XmlReader :: fromstring（），XMLWRITER :: tostream（），XMLWRITER :: touri（）和XMLWriter（）和XMLWRITER :: tomemory（tomemory（tomemory）方法。
- 新grupheme_str_split（）函數(shù)。
棄用和向后兼容性中斷
- IMAP, OCI8, PDO_OCI, and pspell extensions have been unbundled and moved to PECL.
- 隱式無(wú)效的參數(shù)類型現(xiàn)在已棄用。
- 現(xiàn)在使用_用作班級(jí)名稱。
- 將零提高到負(fù)數(shù)的功率現(xiàn)在已貶值。
- 將無(wú)效模式傳遞給圓（）拋出valueerror。
- 現(xiàn)在鍵入擴(kuò)展日期，INTL，PDO，REFLECTION，SPL，SQLITE，XMLREEDER的類常數(shù)。
- GMP課程現(xiàn)在是最終的。
- mysqli_set_charset_dir，mysqli_stmt_attr_prefetch_rows，mysqli_cursor_type_for_update，mysqli_cursor_type_scrollable，mysqli_type_interval常數(shù)已被撤消。
- mysqli_ping（），mysqli_kill（），mysqli_refresh（）函數(shù)，mysqli :: ping（），mysqli :: kill（kill（），mysqli :: recresh（refresh（）方法，mysqli_refresh_*常數(shù)已被execectedeced。
- stream_bucket_make_writable（）和stream_bucket_new（）現(xiàn)在返回streambucket的實(shí)例而不是stdclass。
- 退出（）行為改變。
- e_strict常數(shù)已被棄用。
更好的性能、更好的語(yǔ)法、改進(jìn)的類型安全性。 現(xiàn)在升級(jí)到PHP 8.4！
有關(guān)PHP 8.4的源下載，請(qǐng)?jiān)L問(wèn) 下載 頁(yè)。 Windows二進(jìn)制文件可以在 Windows的PHP 地點(diǎn)。更改列表記錄在 ChangElog。
這 遷移指南 可在PHP手冊(cè)中使用。請(qǐng)咨詢以獲取新功能和向后不兼容的更改的詳細(xì)列表。