PHP 8.1

• PHP Дайджест
• PHP.Watch
• stitcher.io

New Features

• Intersection Types
• Enums
• never return type
• Fibers
• Readonly Properties
• New in initializers
• final class constants
• New fsync and fdatasync functions
• New array_is_list function
• New Sodium XChaCha20 functions
• GD: AVIF image support
• Intl: New IntlDatePatternGenerator class
• Phar: Added OpenSSL-256 and OpenSSL-512 signature algorithms
• GD: Lossless WebP encoding support
• New #[ReturnTypeWillChange] attribute
• First-class Callable Syntax
• $_FILES: New full_path value for directory-uploads
• Array unpacking support for string-keyed arrays
• Explicit Octal numeral notation
• Hash functions accept algorithm-specific $options
• MurmurHash3 hash algorithm support
• xxHash hash algorithms support
• FPM: Configurable child-process spawn rate
• Curl: DNS-over-HTTPS support
• Curl: File uploads from strings with CURLStringFile
• MySQLi: New MYSQLI_REFRESH_REPLICA constant

Syntax/Functionality Changes

• HTML entity en/decode functions process single quotes and substitute by default
• $GLOBALS variable restrictions
• Phar: Default signature algorithm changed from SHA1 to SHA256
• SplFixedArray implements JsonSerializable, and json-encodes as an array
• CLI: Interactive shell (php -a) requires readline extension
• MySQLi: Default error mode set to exceptions
• Configurable line endings for fputcsv and SplFileObject::fputcsv
• version_compare operator restrictions
• Warning on compact function calls with non-string and non-array string parameters
• finfo Extension: file_info resource are migrated to existing finfo objects
• IMAP: imap resources are IMAP\Connection class objects
• FTP Extension: Connection resources are FTP\Connection class objects
• GD Extension: Font identifiers are GdFont class objects
• LDAP: resources migrated to LDAP\Connection, LDAP\Result, and LDAP\ResultEntry objects
• PostgreSQL: resources migrated to PgSql\Connection, PgSql\Result, and PgSql\Lob objects
• Pspell: pspell, pspell config resources are PSpell\Dictionary, PSpell\Config class objects

Deprecations

• Passing null to non-nullable internal function parameters is deprecated
• Return types in PHP built-in class methods and deprecation notices
• Serializable interface deprecated
• Implicit incompatible float to int conversion is deprecated
• mysqli::get_client_info method and mysqli_get_client_info($param) is deprecated
• date_sunrise, date_sunset functions and related INI settings are deprecated
• strptime function is deprecated
• mhash*() functions (hash extension) are deprecated
• filter.default and filter.default_options INI settings are deprecated
• PDO::FETCH_SERIALIZE is deprecated
• auto_detect_line_endings INI directive is deprecated
• strftime and gmstrftime functions are deprecated
• MySQLi: mysqli_driver->driver_version property is deprecated

Useful commands and tools

• Psalm
• PHPStan
• PHPCompatibility
• composer why-not php ^8.1
• composer require symfony/polyfill-php81

Fibers

• https://clue.engineering/2021/fibers-in-php