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New Features in PHP 8.4

• Sodium: AEGIS-128L and AEGIS256 support
• New array_find, array_find_key, array_any, and array_all functions
• New grapheme_str_split function
• BCMath: New bcdivmod function
• Intl: New intltz_get_iana_id function and IntlTimeZone::getCanonicalID method
• Curl: New CURL_HTTP_VERSION_3 and CURL_HTTP_VERSION_3ONLY constants for HTTP/3 support
• #[Deprecated] attribute
• Curl: curl_getinfo - CURLINFO_POSTTRANSFER_TIME_T support
• Curl: New CURLOPT_PREREQFUNCTION option
• Curl: New CURLOPT_DEBUGFUNCTION option
• Curl: New CURLOPT_SERVER_RESPONSE_TIMEOUT option to replace CURLOPT_FTP_RESPONSE_TIMEOUT
• Curl: New CURLOPT_TCP_KEEPCNT option
• phpinfo: Show PHP Integer Size information
• Mbstring: New mb_trim, mb_ltrim, and mb_rtrim functions
• Date: New DateTime(Immutable)::createFromTimestamp methods
• New rounding modes in round() function
• Date: New DateTime(Immutable)::get/setMicrosecond methods
• New request_parse_body function
• PCRE2 Upgrade and Regular Expression Changes
• Curl: curl_version() feature_list support
• New http_(get|clear)_last_response_headers functions
• New mb_ucfirst and mb_lcfirst functions

Syntax/Functionality Changes in PHP 8.4

• Curl: CURLOPT_DNS_USE_GLOBAL_CACHE no longer has any effect
• MBString: Unicode Character Database updated to version 16
• exit/die changed from language constructs to functions
• round() - Invalid rounding modes throw \ValueError exceptions
• Password Hashing: Default Bcrypt cost changed from 10 to 12
• PHP_ZTS and PHP_DEBUG constant value type changed from int to bool
• Opcache: INI changes on how JIT is enabled
• OpenSSL: Minimum required OpenSSL version increased to 1.1.1
• Curl: Minimum required libcurl version increased to 7.61.0

Deprecations in PHP 8.4

• Implicitly nullable parameter declarations deprecated
• E_STRICT constant deprecated
• Calling session_set_save_handler() with more than 2 arguments deprecated
• CSV: The $escape parameter must be provided
• SUNFUNCS_RET_* constants deprecated
• Curl: CURLOPT_BINARYTRANSFER deprecated

Removed Features and Functionality in PHP 8.4

• Pspell extension moved from PHP Core to PECL
• IMAP extension moved from PHP Core to PECL
• OCI8 and PDO-OCI extensions from PHP Core to PECL