Released!
PHP 8.4 is a major update of the PHP language.
It contains many new features, such as property hooks, asymmetric visibility, an updated DOM API, performance improvements, bug fixes, and general cleanup.
It contains many new features, such as property hooks, asymmetric visibility, an updated DOM API, performance improvements, bug fixes, and general cleanup.
Property hooks RFC Doc
PHP < 8.4
<?phpclass 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($brazilianPortuguese->getCountryCode()); // BRvar_dump($brazilianPortuguese->getCombinedCode()); // pt_BRPHP 8.4
<?phpclass 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->countryCode, $this->languageCode] = explode('_', $value, 2); } } public function __construct(string $languageCode, string $countryCode) { $this->languageCode = $languageCode; $this->countryCode = $countryCode; }}$brazilianPortuguese = new Locale('pt', 'br');var_dump($brazilianPortuguese->countryCode); // BRvar_dump($brazilianPortuguese->combinedCode); // pt_BR
Property hooks provide support for computed properties that can natively be understood by IDEs and static analysis tools, without needing to write docblock comments that might go out of sync. Furthermore, they allow reliable pre- or post-processing of values, without needing to check whether a matching getter or setter exists in the class.
Asymmetric Visibility RFC Doc
PHP < 8.4
<?phpclass 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}"; }}PHP 8.4
<?phpclass PhpVersion{ public private(set) string $version = '8.4'; public function increment(): void { [$major, $minor] = explode('.', $this->version); $minor++; $this->version = "{$major}.{$minor}"; }}
The scope to write to a property may now be controlled independently from the scope to read the property, reducing the need for boilerplate getter methods to expose a property’s value without allowing modification from the outside of a class.
#[\Deprecated] Attribute RFC
Doc
PHP < 8.4
<?phpclass 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();PHP 8.4
<?phpclass 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() insteadecho $phpVersion->getPhpVersion();
The new
#[\Deprecated] attribute makes PHP’s existing deprecation mechanism available to user-defined functions, methods, and class constants. New ext-dom features and HTML5 support RFC RFC Doc
PHP < 8.4
<?php$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); // Simplifiedvar_dump(in_array("featured", $classes)); // bool(true)PHP 8.4
<?php$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)New DOM API that includes standards-compliant support for parsing HTML5 documents, fixes several long-standing compliance bugs in the behavior of the DOM functionality, and adds several functions to make working with documents more convenient.
The new DOM API is available within the Dom namespace. Documents using the new DOM API can be created using the Dom\HTMLDocument and Dom\XMLDocument classes.
Object API for BCMath RFC
PHP < 8.4
<?php$num1 = '0.12345';$num2 = 2;$result = bcadd($num1, $num2, 5);echo $result; // '2.12345'var_dump(bccomp($num1, $num2) > 0); // falsePHP 8.4
<?phpuse BcMath\Number;$num1 = new Number('0.12345');$num2 = new Number('2');$result = $num1 + $num2;echo $result; // '2.12345'var_dump($num1 > $num2); // falseNew BcMath\Number object enables object-oriented usage and standard mathematical operators when working with arbitrary precision numbers.
These objects are immutable and implement the Stringable interface, so they can be used in string contexts like echo $num.
New array_*() functions RFC
PHP < 8.4
<?php$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"PHP 8.4
<?php$animal = array_find( ['dog', 'cat', 'cow', 'duck', 'goose'], static fn (string $value): bool => str_starts_with($value, 'c'),);var_dump($animal); // string(3) "cat"PDO driver specific subclasses RFC
PHP < 8.4
<?php$connection = new PDO( 'sqlite:foo.db', $username, $password,); // object(PDO)$connection->sqliteCreateFunction( 'prepend_php', static fn ($string) => "PHP {$string}",);$connection->query('SELECT prepend_php(version) FROM php');PHP 8.4
<?php$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');
New subclasses
Pdo\Dblib, Pdo\Firebird, Pdo\MySql, Pdo\Odbc, Pdo\Pgsql, and Pdo\Sqlite of PDO are available.
new MyClass()->method() without parentheses RFC
Doc
PHP < 8.4
<?phpclass PhpVersion{ public function getVersion(): string { return 'PHP 8.3'; }}var_dump((new PhpVersion())->getVersion());PHP 8.4
<?phpclass PhpVersion{ public function getVersion(): string { return 'PHP 8.4'; }}var_dump(new PhpVersion()->getVersion());
Properties and methods of a newly instantiated object can now be accessed without wrapping the
new expression in parentheses. New Classes, Interfaces, and Functions
- New Lazy Objects.
- New JIT implementation based on IR Framework.
- New
request_parse_body()function. - New
bcceil(),bcdivmod(),bcfloor(), andbcround()functions. - New
RoundingModeenum forround()with 4 new rounding modesTowardsZero,AwayFromZero,NegativeInfinity, andPositiveInfinity. - New
DateTime::createFromTimestamp(),DateTime::getMicrosecond(),DateTime::setMicrosecond(),DateTimeImmutable::createFromTimestamp(),DateTimeImmutable::getMicrosecond(), andDateTimeImmutable::setMicrosecond()methods. - New
mb_trim(),mb_ltrim(),mb_rtrim(),mb_ucfirst(), andmb_lcfirst()functions. - New
pcntl_getcpu(),pcntl_getcpuaffinity(),pcntl_getqos_class(),pcntl_setns(), andpcntl_waitid()functions. - New
ReflectionClassConstant::isDeprecated(),ReflectionGenerator::isClosed(), andReflectionProperty::isDynamic()methods. - New
http_get_last_response_headers(),http_clear_last_response_headers(), andfpow()functions. - New
XMLReader::fromStream(),XMLReader::fromUri(),XMLReader::fromString(),XMLWriter::toStream(),XMLWriter::toUri(), andXMLWriter::toMemory()methods. - New
grapheme_str_split()function.
Deprecations and backward compatibility breaks
- The IMAP, OCI8, PDO_OCI, and pspell extensions have been unbundled and moved to PECL.
- Implicitly nullable parameter types are now deprecated.
- Using
_as a class name is now deprecated. - Raising zero to the power of a negative number is now deprecated.
- Passing invalid mode to
round()throwsValueError. - Class constants from extensions
date,intl,pdo,reflection,spl,sqlite,xmlreaderare typed now. GMPclass is now final.MYSQLI_SET_CHARSET_DIR,MYSQLI_STMT_ATTR_PREFETCH_ROWS,MYSQLI_CURSOR_TYPE_FOR_UPDATE,MYSQLI_CURSOR_TYPE_SCROLLABLE, andMYSQLI_TYPE_INTERVALconstants have been removed.mysqli_ping(),mysqli_kill(),mysqli_refresh()functions,mysqli::ping(),mysqli::kill(),mysqli::refresh()methods, andMYSQLI_REFRESH_*constants have been deprecated.stream_bucket_make_writeable()andstream_bucket_new()now return an instance ofStreamBucketinstead ofstdClass.exit()behavioral change.E_STRICTconstant has been deprecated.
