interface I {
// We may naively assume that the PHP constant is always a string.
const PHP = 'PHP 8.2';
}
class Foo implements I {
// But implementing classes may define it as an array.
const PHP = [];
}
interface I {
const string PHP = 'PHP 8.3';
}
class Foo implements I {
const string PHP = [];
}
// Fatal error: Cannot use array as value for class constant
// Foo::PHP of type string
class Foo {
const PHP = 'PHP 8.2';
}
$searchableConstant = 'PHP';
var_dump(constant(Foo::class . "::{$searchableConstant}"));
class Foo {
const PHP = 'PHP 8.3';
}
$searchableConstant = 'PHP';
var_dump(Foo::{$searchableConstant});
#[\Override]
属性 RFC
use PHPUnit\Framework\TestCase;
final class MyTest extends TestCase {
protected $logFile;
protected function setUp(): void {
$this->logFile = fopen('/tmp/logfile', 'w');
}
protected function taerDown(): void {
fclose($this->logFile);
unlink('/tmp/logfile');
}
}
// The log file will never be removed, because the
// method name was mistyped (taerDown vs tearDown).
use PHPUnit\Framework\TestCase;
final class MyTest extends TestCase {
protected $logFile;
protected function setUp(): void {
$this->logFile = fopen('/tmp/logfile', 'w');
}
#[\Override]
protected function taerDown(): void {
fclose($this->logFile);
unlink('/tmp/logfile');
}
}
// Fatal error: MyTest::taerDown() has #[\Override] attribute,
// but no matching parent method exists
#[\Override]
属性,PHP 将确保在父类或实现的接口中存在同名的方法。添加该属性表示明确说明覆盖父方法是有意为之,并且简化了重构过程,因为删除被覆盖的父方法将被检测出来。 class PHP {
public string $version = '8.2';
}
readonly class Foo {
public function __construct(
public PHP $php
) {}
public function __clone(): void {
$this->php = clone $this->php;
}
}
$instance = new Foo(new PHP());
$cloned = clone $instance;
// Fatal error: Cannot modify readonly property Foo::$php
class PHP {
public string $version = '8.2';
}
readonly class Foo {
public function __construct(
public PHP $php
) {}
public function __clone(): void {
$this->php = clone $this->php;
}
}
$instance = new Foo(new PHP());
$cloned = clone $instance;
$cloned->php->version = '8.3';
readonly
属性现在可以在魔术方法 __clone
中被修改一次,以此实现只读属性的深拷贝 json_validate()
函数 RFC
文档
function json_validate(string $string): bool {
json_decode($string);
return json_last_error() === JSON_ERROR_NONE;
}
var_dump(json_validate('{ "test": { "foo": "bar" } }')); // true
var_dump(json_validate('{ "test": { "foo": "bar" } }')); // true
json_validate()
可以检查一个字符串是否为语法正确的 JSON,比 json_decode()
更有效。 Randomizer::getBytesFromString()
方法 RFC
文档
// This function needs to be manually implemented.
function getBytesFromString(string $string, int $length) {
$stringLength = strlen($string);
$result = '';
for ($i = 0; $i < $length; $i++) {
// random_int is not seedable for testing, but secure.
$result .= $string[random_int(0, $stringLength - 1)];
}
return $result;
}
$randomDomain = sprintf(
"%s.example.com",
getBytesFromString(
'abcdefghijklmnopqrstuvwxyz0123456789',
16,
),
);
echo $randomDomain;
// A \Random\Engine may be passed for seeding,
// the default is the secure engine.
$randomizer = new \Random\Randomizer();
$randomDomain = sprintf(
"%s.example.com",
$randomizer->getBytesFromString(
'abcdefghijklmnopqrstuvwxyz0123456789',
16,
),
);
echo $randomDomain;
Randomizer::getFloat()
和 Randomizer::nextFloat()
方法 RFC
文档
// Returns a random float between $min and $max, both including.
function getFloat(float $min, float $max) {
// This algorithm is biased for specific inputs and may
// return values outside the given range. This is impossible
// to work around in userland.
$offset = random_int(0, PHP_INT_MAX) / PHP_INT_MAX;
return $offset * ($max - $min) + $min;
}
$temperature = getFloat(-89.2, 56.7);
$chanceForTrue = 0.1;
// getFloat(0, 1) might return the upper bound, i.e. 1,
// introducing a small bias.
$myBoolean = getFloat(0, 1) < $chanceForTrue;
$randomizer = new \Random\Randomizer();
$temperature = $randomizer->getFloat(
-89.2,
56.7,
\Random\IntervalBoundary::ClosedClosed,
);
$chanceForTrue = 0.1;
// Randomizer::nextFloat() is equivalent to
// Randomizer::getFloat(0, 1, \Random\IntervalBoundary::ClosedOpen).
// The upper bound, i.e. 1, will not be returned.
$myBoolean = $randomizer->nextFloat() < $chanceForTrue;
由于浮点数的精度和隐式四舍五入的限制,在特定区间内生成无偏差的浮点数并非易事,常建的用户解决方案可能会生成有偏差的结果或超出要求范围的数字。
Randomizer 扩展了两种方法,用于随机生成无偏差的浮点数。Randomizer::getFloat()
方法使用的是 γ-section 算法,该算法发表于 Drawing Random Floating-Point Numbers from an Interval. Frédéric Goualard, ACM Trans. Model. Comput. Simul., 32:3, 2022.
php -l foo.php bar.php
No syntax errors detected in foo.php
php -l foo.php bar.php
No syntax errors detected in foo.php
No syntax errors detected in bar.php
命令行 linter 现在接受文件名的可变输入以进行 lint
DOMElement::getAttributeNames()
、DOMElement::insertAdjacentElement()
、DOMElement::insertAdjacentText()
、DOMElement::toggleAttribute()
、DOMNode::contains()
、DOMNode::getRootNode()
、DOMNode::isEqualNode()
、DOMNameSpaceNode::contains()
和 DOMParentNode::replaceChildren()
方法。IntlCalendar::setDate()
、IntlCalendar::setDateTime()
、IntlGregorianCalendar::createFromDate()
和 IntlGregorianCalendar::createFromDateTime()
方法。ldap_connect_wallet()
和 ldap_exop_sync()
函数。mb_str_pad()
函数。posix_sysconf()
、posix_pathconf()
、posix_fpathconf()
和 posix_eaccess()
函数。ReflectionMethod::createFromMethodName()
方法socket_atmark()
函数。str_increment()
、str_decrement()
和 stream_context_set_options()
函数。ZipArchive::getArchiveFlag()
方法。zend.max_allowed_stack_size
用于设置允许的最大堆栈大小。n
时,将确保下一个索引是 n + 1
而不是 0
。range()
函数的更改。U_MULTIPLE_DECIMAL_SEPERATORS
常量已被废弃,改为 U_MULTIPLE_DECIMAL_SEPARATORS
。MT_RAND_PHP
Mt19937 变体已被废弃。ReflectionClass::getStaticProperties()
不再为空。assert.active
、assert.bail
、assert.callback
、assert.exception
和 assert.warning
已被废弃。get_class()
和 get_parent_class()
时未提供参数,已被废弃。