README

Phuture Continuum

A forward-compatibility layer bringing tomorrow’s PHP features to today’s runtimes.

Introduction

Continuum bridges the gap between PHP versions by extending Symfony Polyfill with additional methods, constants, and stubs. Built on Symfony's solid foundation, Continuum provides extra polyfills and graceful fallbacks—enabling you to write forward-compatible code that works consistently across different PHP runtimes.

Features

This package polyfills most common PHP functions from PHP 8.1 to 8.5, designed to be used on PHP 8.0 or later.

Polyfill	Level	Type
▶️ PHP 8.1+
`array_is_list()`	✅ Full	Function
`enum_exists()`	✅ Full	Function
`fsync()`	❇️ Partial	Function
`fdatasync()`	❇️ Partial	Function
`IMAGETYPE_AVIF`	✅ Full	Constant
`IMG_AVIF`	✅ Full	Constant
`IMG_WEBP_LOSSLESS`	✅ Full	Constant
`MYSQLI_REFRESH_REPLICA`	✅ Full	Constant
`T_READONLY`	✅ Full	Constant
`CURLStringFile`	✅ Full	Class
`ReturnTypeWillChange`	✅ Full	Attribute
▶️ PHP 8.2+
`ini_parse_quantity()`	✅ Full	Function
`odbc_connection_string_is_quoted()`	✅ Full	Function
`odbc_connection_string_should_quote()`	✅ Full	Function
`odbc_connection_string_quote()`	✅ Full	Function
`curl_upkeep()`	❇️ Partial	Function
`memory_reset_peak_usage()`	⚠️ No-op	Function
`mysqli_execute_query()`	✅ Full	Function
`openssl_cipher_key_length()`	✅ Full	Function
`imap_is_open()`	✅ Full	Function
`AllowDynamicProperties`	✅ Full	Attribute
`SensitiveParameter`	✅ Full	Attribute
`SensitiveParameterValue`	✅ Full	Class
`Random\Engine`	✅ Full	Interface
`Random\CryptoSafeEngine`	✅ Full	Interface
`Random\Engine\Secure`	✅ Full	Class
▶️ PHP 8.3+
`json_validate()`	✅ Full	Function
`mb_str_pad()`	✅ Full	Function
`str_increment()`	✅ Full	Function
`str_decrement()`	✅ Full	Function
`stream_context_set_options()`	✅ Full	Function
`posix_eaccess()`	✅ Full	Function
`POSIX_PC_*` (10 constants)	✅ Full	Constant
`POSIX_*_OK` (4 constants)	✅ Full	Constant
`Override`	✅ Full	Attribute
`DateError` / `DateException` (and related)	✅ Full	Class
`SQLite3Exception`	✅ Full	Class
`ldap_exop_sync()`	✅ Full	Function
`ldap_connect_wallet()`	✅ Full	Function
▶️ PHP 8.4+
`array_find()`	✅ Full	Function
`array_find_key()`	✅ Full	Function
`array_any()`	✅ Full	Function
`array_all()`	✅ Full	Function
`fpow()`	✅ Full	Function
`grapheme_str_split()`	✅ Full	Function
`PHP_SBINDIR`	✅ Full	Constant
`CURL_HTTP_VERSION_3`	✅ Full	Constant
`CURL_HTTP_VERSION_3ONLY`	✅ Full	Constant
`Deprecated`	✅ Full	Attribute
`RoundingMode`	✅ Full	Enum
`ReflectionConstant`	✅ Full	Class
`PDO` driver subclasses (Dblib, Firebird, etc.)	✅ Full	Class
▶️ PHP 8.5+
`array_first()`	✅ Full	Function
`array_last()`	✅ Full	Function
`get_error_handler()`	✅ Full	Function
`get_exception_handler()`	✅ Full	Function
`locale_is_right_to_left()`	✅ Full	Function
`grapheme_levenshtein()`	✅ Full	Function
`PHP_BUILD_DATE`	✅ Full	Constant
`PHP_BUILD_PROVIDER`	✅ Full	Constant
`NoDiscard`	✅ Full	Attribute
`DelayedTargetValidation`	✅ Full	Attribute
`Uri\Rfc3986\Uri`	✅ Full	Class
`Uri\WhatWg\Url`	✅ Full	Class
`Uri\WhatWg\InvalidUrlException`	✅ Full	Class
`Uri\WhatWg\UrlValidationError`	✅ Full	Class
`Uri\WhatWg\UrlValidationErrorType`	✅ Full	Class
`Uri\UriException`	✅ Full	Class
`Uri\InvalidUriException`	✅ Full	Class
`Uri\UriComparisonMode`	✅ Full	Class
`Filter\FilterException`	✅ Full	Class
`Filter\FilterFailedException`	✅ Full	Class

This package also provides polyfills for some PHP extensions, allowing better portability across different PHP runtimes.

Extension	Level
`ext-mbstring`	⚠️ Partial
`ext-iconv`	✅ Full
`ext-apcu`	⚠️ Partial
`ext-ctype`	✅ Full
`ext-uuid`	✅ Full
`ext-bcmath`	✅ Full
`ext-intl`	⚠️ Partial
`ext-zip`	⚠️ Partial

What's Not Covered

The entries marked ❇️ Partial or ⚠️ Partial in the tables above have meaningful gaps. This section documents exactly what each one omits or cannot replicate.

Partial Polyfills

fsync() / fdatasync() (PHP 8.1)

Both fall back to fflush(), plus posix_fsync() when the posix extension is loaded.
There is no guarantee of actual disk-level synchronization on systems without the POSIX extension.
The return value is always true, even when the underlying OS sync did not occur.

curl_upkeep() (PHP 8.2)

Only sets CURLOPT_FORBID_REUSE = false and CURLOPT_FRESH_CONNECT = false.
Does not perform real HTTP/2 connection maintenance (window-size updates, PING frames, or keep-alive signalling).
Full behaviour requires PHP 8.2+ with libcurl ≥ 7.62.0.

Partial Extensions

ext-mbstring

The only functions with no polyfill are the stateful regex-search family: mb_ereg_search(), mb_ereg_search_init(), mb_ereg_search_pos(), mb_ereg_search_regs(), mb_ereg_search_getpos(), mb_ereg_search_getregs(), and mb_ereg_search_setpos().
mb_convert_kana() supports only the R, r, N, n, K, k, V, A, a conversion modes.

ext-apcu

In-memory, non-persistent cache: data is lost between requests.
Scoped to a single process; entries are not shared across PHP-FPM workers.
No atomic operations beyond basic get/set; no TTL-based eviction or shared-memory sizing.

ext-intl

Collator: simplified sorting - does not implement the full Unicode Collation Algorithm.
NumberFormatter: advanced formatting features (currency symbol overrides, padding, significant digits) are missing.
Locale: operations are simplified; no full CLDR data lookup.
No direct access to ICU binary data; limited to the subset bundled with Symfony.

ext-zip

ZipArchive::getArchiveFlag() - always returns 0; archive-level flags are a libzip internal concept not accessible through userland php.
ZipArchive::setArchiveFlag() - always returns false.
ZipArchive::registerProgressCallback() - always returns false.
ZipArchive::registerCancelCallback() - always returns false.
Procedural zip_entry_open() only accepts modes r and rb; write-mode entry access is not supported.
Multi-disk ZIP archives are not supported.
Writing with compression methods CM_LZMA, CM_LZMA2, and CM_XZ is not supported.

Installation

composer require phuture/continuum

Contributing

Thank you for considering contributing to this project! You can read the Contribution Guide and our Developer Workflow Guide.

Code of Conduct

This project follows a Code of Conduct that all community members and contributors are expected to adhere to our Contributor Code of Conduct.

License

This project is open-source and available under the MIT License.

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