Skip to content
Switch branches/tags
Go to file
Cannot retrieve contributors at this time
700 lines (555 sloc) 25.8 KB
1. Backward Incompatible Changes
2. New Features
3. Changes in SAPI modules
4. Deprecated Functionality
5. Changed Functions
6. New Functions
7. New Classes and Interfaces
8. Removed Extensions and SAPIs
9. Other Changes to Extensions
10. New Global Constants
11. Changes to INI File Handling
12. Windows Support
13. Migration to pkg-config
14. Other Changes
15. Performance Improvements
1. Backward Incompatible Changes
- Core:
. get_declared_classes() no longer returns anonymous classes that haven't
been instantiated yet.
. "fn" is now a reserved keyword. In particular it can no longer be used as a
function or class name. It can still be used as a method or class constant
. Passing the result of a (non-reference) list() assignment by reference is
consistently disallowed now. Previously this worked if the right hand side
was a simple (CV) variable and did not occur as part of the list().
. Added --ini-path and --ini-dir options to php-config.
- BCMath:
. BCMath functions will now warn if a non well-formed number is passed, such
as "32foo". The argument will be interpreted as zero (as before).
- Curl:
. Attempting to serialize a CURLFile class will now generate an exception.
Previously the exception was only thrown on unserialization.
. Using CURLPIPE_HTTP1 is deprecated, and is no longer supported as of cURL
. The $version parameter of curl_version() is deprecated. If any value not
equal to the default CURLVERSION_NOW is passed, a warning is raised and the
parameter is ignored.
- Date:
. Calling var_dump() or similar on a DateTime(Immutable) instance will no
longer leave behind accessible properties on the object.
. Comparison of DateInterval objects (using ==, < and so on) will now generate
a warning and always return false. Previously all DateInterval objects were
considered equal, unless they had properties.
- Intl:
. The default parameter value of idn_to_ascii() and idn_to_utf8() is now
INTL_IDNA_VARIANT_UTS46 instead of the deprecated INTL_IDNA_VARIANT_2003.
- MySQLi:
. The embedded server functionality has been removed. It was broken since
at least PHP 7.0.
. The undocumented mysqli::$stat property has been removed in favor of
- Openssl:
. The openssl_random_pseudo_bytes() function will now throw an exception in
error situations, similar to random_bytes(). In particular, an Error is
thrown if the number of requested bytes is smaller *or equal* than zero,
and an Exception is thrown is sufficient randomness cannot be gathered.
The $crypto_strong output argument is guaranteed to always be true if the
function does not throw, so explicitly checking it is not necessary.
. When PREG_UNMATCHED_AS_NULL mode is used, trailing unmatched capturing
groups will now also be set to null (or [null, -1] if offset capture is
enabled). This means that the size of the $matches will always be the same.
. Installation of PEAR (including PECL) is no longer enabled by default. It
can be explicitly enabled using --with-pear. This option is deprecated and
may be removed in the future.
- PDO:
. Attempting to serialize a PDO or PDOStatement instance will now generate
an Exception rather than a PDOException, consistent with other internal
classes which do not support serialization.
- Reflection:
. Reflection objects will now generate an exception if an attempt is made
to serialize them. Serialization for reflection objects was never
supported and resulted in corrupted reflection objects. It has been
explicitly prohibited now.
- SPL:
. Calling get_object_vars() on an ArrayObject instance will now always return
the properties of the ArrayObject itself (or a subclass). Previously it
returned the values of the wrapped array/object unless the STD_PROP_LIST
flag was specified. Other affected operations are:
* ReflectionObject::getProperties()
* reset(), current(), etc. Use Iterator methods instead.
* Potentially others working on object properties as a list.
(array) casts are *not* affected. They will continue to return either the
wrapped array, or the ArrayObject properties, depending on whether the
STD_PROP_LIST flag is used.
. SplPriorityQueue::setExtractFlags() will throw an exception if zero is
passed. Previously this would generate a recoverable fatal error on the
next extraction operation.
. ArrayObject, ArrayIterator, SplDoublyLinkedList and SplObjectStorage now
support the __serialize() + __unserialize() mechanism in addition to the
Serializable interface. This means that serialization payloads created on
older PHP versions can still be unserialized, but new payloads created by
PHP 7.4 will not be understood by older versions.
- Standard:
. The "o" serialization format has been removed. As it is never produced by
PHP, this may only break unserialization of manually crafted strings.
. Password hashing algorithm identifiers are now nullable strings rather
than integers.
* PASSWORD_DEFAULT was int 1; now is null
* PASSWORD_BCRYPT was int 1; now is string '2y'
* PASSWORD_ARGON2I was int 2; now is string 'argon2i'
* PASSWORD_ARGON2ID was int 3; now is string 'argon2id'
Applications correctly using the constants PASSWORD_DEFAULT,
function correctly.
2. New Features
- Core:
. Added support for typed properties. For example:
class User {
public int $id;
public string $name;
This will enforce that $user->id can only be assigned integer and
$user->name can only be assigned strings. For more information see the
. Added support for arrow functions with implicit by-value scope binding.
For example:
$factor = 10;
$nums = array_map(fn($num) => $num * $factor, $nums);
. Added support for limited return type covariance and argument type
contravariance. The following code will now work:
class A {}
class B extends A {}
class Producer {
public function method(): A {}
class ChildProducer extends Producer {
public function method(): B {}
Full variance support is only available if autoloading is used. Inside a
single file only non-cyclic type references are possible, because all
classes need to be available before they are referenced.
. Added support for coalesce assign (??=) operator. For example:
$array['key'] ??= computeDefault();
// is roughly equivalent to
if (!isset($array['key'])) {
$array['key'] = computeDefault();
. Added support for unpacking inside arrays. For example:
$arr1 = [3, 4];
$arr2 = [1, 2, ...$arr1, 5];
// $arr2 == [1, 2, 3, 4, 5]
. Added support for underscore separators in numeric literals. Some examples:
6.674_083e-11; // float
299_792_458; // decimal
0xCAFE_F00D; // hexadecimal
0b0101_1111; // binary
. Support for WeakReferences has been added.
. Throwing exceptions from __toString() is now permitted. Previously this
resulted in a fatal error. Existing recoverable fatals in string conversions
have been converted to Error exceptions.
. CURLFile now supports stream wrappers in addition to plain file names, if
the extension has been built against libcurl >= 7.56.0. The streams may
need to be seekable.
- Filter:
. The FILTER_VALIDATE_FLOAT filter now supports the min_range and max_range
options, with the same semantics as FILTER_VALIDATE_INT.
- FFI:
. A new extension which provides a simple way to call native functions, access
native variables and create/access data structures defined in C libraries.
- GD:
. Added the "scatter" image filter (IMG_FILTER_SCATTER) to apply a scatter
filter to images. This filter has the following prototype:
imagefilter($im, IMG_FILTER_SCATTER, int $sub, int $plus, array $colors = []);
The $colors array can be populated with a set of indexed colors where to
apply the scatter pixel shifting on.
Note, the result of this filter is always random.
- Hash:
. Added "crc32c" hash using Castagnoli's polynomial. This crc32 variant is
used by storage systems, such as iSCSI, SCTP, Btrfs and ext4.
- Mbstring:
. Added mb_str_split() function, which provide the same functionality as
str_split(), but operating on code points rather than bytes.
- OPcache:
. Support for preloading code has been added.
. The preg_replace_callback() and preg_replace_callback_array() functions now
accept an additional $flags argument, with support for the
format of the matches array passed to to the callback function.
- PDO:
. The username and password can now be specified as part of the PDO DSN for
the mysql, mssql, sybase, dblib, firebird and oci drivers. Previously this
was only supported by the pgsql driver. If a username/password is specified
both in the constructor and the DSN, the constructor takes precedence.
new PDO("mysql:host=xxx;port=xxx;dbname=xxx;user=xxx;password=xxx");
. PDOStatement::getColumnMeta() is now available
- PDO_SQLite:
. PDOStatement::getAttribute(PDO::SQLITE_ATTR_READONLY_STATEMENT) allows to
check whether this statement is read-only, i.e. whether it doesn't modify
the database.
. PDO::setAttribute(PDO::SQLITE_ATTR_EXTENDED_RESULT_CODES, true) enables the
use of SQLite3 extended result codes in errorInfo().
- SQLite3:
. Added SQLite3::lastExtendedErrorCode() to fetch the last extended result
. Added SQLite3::enableExtendedResultCodes($enable = true), which will make
SQLite3::lastErrorCode() return extended result codes.
- Standard:
. strip_tags() now also accepts an array of allowed tags: Instead of
strip_tags($str, '<a><p>') you can now write strip_tags($str, ['a', 'p']).
. A new mechanism for custom object serialization has been added, which
uses two new magic methods:
// Returns array containing all the necessary state of the object.
public function __serialize(): array;
// Restores the object state from the given data array.
public function __unserialize(array $data): void;
The new serialization mechanism supersedes the Serializable interface,
which will be deprecated in the future.
. array_merge() and array_merge_recursive() may now be called without any
arguments, in which case they will return an empty array. This is useful
in conjunction with the spread operator, e.g. array_merge(...$arrays).
. proc_open() now accepts an array instead of a string for the command. In
this case the process will be opened directly (without going through a
shell) and PHP will take care of any necessary argument escaping.
proc_open(['php', '-r', 'echo "Hello World\n";'], $descriptors, $pipes);
. password_hash() has argon2i(d) implementations from ext/sodium when PHP is
built without libargon.
3. Changes in SAPI modules
4. Deprecated Functionality
- Core:
. Nesting ternary operators without explicit parentheses is deprecated:
// Code like
$a ? $b : $c ? $d : $e
// should be replaced by (current interpretation)
($a ? $b : $c) ? $d : $e
// or (likely intended interpretation)
$a ? $b : ($c ? $d : $e)
. Unbinding $this of a non-static method through a combination of
ReflectionMethod::getClosure() and closure rebinding is deprecated. Doing
so is equivalent to calling a non-static method statically, which has been
deprecated since PHP 7.0.
. Using "parent" inside a class without parent is deprecated, and will throw
a compile-time error in the future. Currently an error will only be
generated if/when the parent is accessed at run-time.
- COM:
. Importing type libraries with case-insensitive constant registering has been
- Mbstring:
. Passing a non-string pattern to mb_ereg_replace() is deprecated. Currently
non-string patterns are interpreted as ASCII codepoints. In PHP 8 the
pattern will be interpreted as a string instead.
. ldap_control_paged_result_response and ldap_control_paged_result are
deprecated. Pagination controls can be sent along with ldap_search instead.
- Reflection:
. Calls to ReflectionType::__toString() now generate a deprecation notice.
This method has been deprecated in favor of ReflectionNamedType::getName()
in the documentation since PHP 7.1, but did not throw a deprecation notice
for technical reasons.
- Standard:
. Passing invalid characters to ''base_convert()'', ''bindec()'', ''octdec()''
and ''hexdec()'' will now generate a deprecation notice. The result will
still be computed as if the invalid characters did not exist. Leading and
trailing whitespace, as well as prefixes of type 0x (depending on base)
continue to be allowed.
5. Changed Functions
- SPL:
. SplFileObject::fputcsv(), ::fgetcsv() and ::setCsvControl() now accept an
empty string as $escape argument, which disables the proprietary PHP
escaping mechanism. SplFileObject::getCsvControl() now may also return an
empty string for the third array element, accordingly.
- Standard:
. fputcsv() and fgetcsv() now accept an empty string as $escape argument,
which disables the proprietary PHP escaping mechanism. The behavior of
str_getcsv() has been adjusted accordingly (formerly, an empty string was
identical to using the default).
. proc_open() on Windows can be passed a "create_process_group" option. It
is required, if the child process is supposed to handle CTRL events.
. password_hash() now accepts nullable string and int as $algo argument.
. password_needs_rehash() now accepts nullable string and int as $algo
6. New Functions
- Core:
. Added get_mangled_object_vars($object) function, which returns the mangled
object properties. It returns the same result as (array) $object, with the
exception that it ignores overloaded array casts, such as used by
- GD:
. Added imagecreatefromtga() function, which allows to read images in TGA
format. TGA support is now also indicated by gd_info() and imagetypes().
Note that TGA images are not recognized by imagecreatefromstring() and
- OpenSSL:
. Added openssl_x509_verify(mixed cert, mixed key) function that verifies the
signature of the certificate using a public key. A wrapper around the
OpenSSL's X509_verify() function.
See <>.
- Pcntl:
. Added bool pcntl_unshare(int flags) function which allows to dissociate
parts of the process execution context which are currently being shared with
other processes. Explicitly, it allows you to unshare the mount, IPC, UTS,
network, PID, user and cgroup namespaces.
- SQLite3:
. Added SQLite3Stmt::getSQL() to retrieve the SQL of the statement. If TRUE is
passed as parameter, query parameters will be replaced in the return value
by their currently bound value, if libsqlite ≥ 3.14 is used.
. Added SQLite3::backup() to create database backups via the SQLite3 online
backup API.
- Standard
. bool sapi_windows_set_ctrl_handler(callable handler, [, bool add = true]) -
set or remove a handler function upon receiving a CTRL event. The handler
function is expected have a signature "function handler(int $event)".
. bool sapi_windows_generate_ctrl_event(int type, int pid) - send a CTRL event
to another process.
. array password_algos() - return a complete list of all registered password
hashing algorithms. For more details see the RFC:
7. New Classes and Interfaces
- Reflection:
. A new ReflectionReference class has been added, which allows detecting
references and comparing them for identity. For more details see the RFC:
8. Removed Extensions and SAPIs
- Interbase:
. The interbase extension has been moved to PECL. Access to an InterBase
and/or FireBird based database is still available with the PDO_Firebird
extension. For more details see the RFC:
. The WDDX extension has been deprecated and moved to PECL.
9. Other Changes to Extensions
- GD:
. The behavior of imagecropauto() in the bundled libgd has been synced with
that of system libgd:
* IMG_CROP_DEFAULT is no longer falling back to IMG_CROP_SIDES
* Threshold-cropping now uses the algorithm of system libgd
. The default $mode parameter of imagecropauto() has been changed to
IMG_CROP_DEFAULT; passing -1 is now deprecated.
. imagescale() now supports aspect ratio preserving scaling to a fixed height
by passing -1 as $new_width.
- Filter:
. The filter extension no longer exposes --with-pcre-dir for Unix builds and
can now reliably be built as shared when using ./configure once more.
- Hash:
. The hash extension cannot be disabled anymore and is always an integral
part of any PHP build, similar to the date extension.
- Intl:
. The Intl extension now requires at least ICU 50.1.
. ResourceBundle now implements Countable.
- Libxml:
. All libxml based extensions now require libxml 2.7.6 or newer.
- Mbstring:
. The oniguruma library is no longer bundled with PHP, instead libonig needs
to be available on the system. Alternatively --disable-mbregex can be used
to disable the mbregex component.
- OPcache:
. The --disable-opcache-file|--enable-opcache-file configure options have been
removed in favor of the opcache.file_cache INI directive.
- Reflection:
. Numeric value of class, property, function and constant modifiers was
changed. Don't filter methods and properties through
ReflectionClass::getMethods() and ReflectionClass::getProperties(), or test
results of Reflection...::getModifiers(), using hard-coded numeric values.
Use corresponding constants instead (e.g. ReflectionMethod::IS_PUBLIC).
- SimpleXML:
. SimpleXMLElement now implements Countable.
- SQLite3:
. The bundled libsqlite has been removed. To build the SQLite3 extension
a system libsqlite3 ≥ 3.7.4 is now required. To build the PDO_SQLite
extension a system libsqlite3 ≥ 3.5.0 is now required.
. (Un)serialization of SQLite3, SQLite3Stmt and SQLite3Result is now
explicitly forbidden. Formerly, serialization of instances of these classes
was possible, but unserialization yielded unusable objects.
. The @param notation can now also be used to denote SQL query parameters.
- Zip:
. The bundled libzip library has been removed. A system libzip >= 0.11 is now
necessary to build the extension.
10. New Global Constants
- Mbstring:
. MB_ONIGURUMA_VERSION specifies the version of the oniguruma library against
which mbregex has been built.
- Socket:
. Added FreeBSD-specific socket options:
- Standard:
- Tidy:
11. Changes to INI File Handling
- zend.exception_ignore_args
. New INI directive which displays or hides arguments from the stack traces
generated for exceptions.
12. Windows Support
- stat:
. The stat implementation has been refactored.
- An inode number is delivered and is based on the NTFS file index.
- The device number is now based on the volume serial number.
Note, that both values derived from the system and provided as is on 64-bit
systems. On 32-bit system, these values might overflow the 32-bit integer in
PHP, so they're a fake.
- CTRL+C and CTRL+BREAK on console can be caught by setting a handler function
with sapi_windows_set_ctrl_handler().
- configure now regards additional CFLAGS and LDFLAGS set as environment
13. Migration to pkg-config
A number of extensions have been migrated to exclusively use pkg-config for
the detection of library dependencies. Generally, this means that instead of
using --with-foo-dir=DIR or similar only --with-foo is used. Custom library
paths can be specified either by adding additional directories to
PKG_CONFIG_PATH or by explicitly specifying compilation options through
The following extensions and SAPIs are affected:
- Curl:
. --with-curl no longer accepts a directory.
- Enchant:
. --with-enchant no longer accepts a directory.
- FPM:
. --with-fpm-systemd now uses only pkg-config for libsystem checks. The
libsystemd minimum required version is 209.
- GD:
. --with-gd becomes --enable-gd (whether to enable the extension at all) and
--with-external-gd (to opt into using an external libgd, rather than the
bundled one).
. --with-png-dir has been removed. libpng is required.
. --with-zlib-dir has been removed. zlib is required.
. --with-freetype-dir becomes --with-freetype.
. --with-jpeg-dir becomes --with-jpeg.
. --with-webp-dir becomes --with-webp.
. --with-xpm-dir becomes --with-xpm.
. --with-kerberos no longer accepts a directory.
- Intl:
. --with-icu-dir has been removed. If --enable-intl is passed, then libicu is
always required.
- Ldap:
. --with-ldap-sasl no longer accepts a directory.
- Libxml:
. --with-libxml-dir has been removed.
. --enable-libxml becomes --with-libxml.
. --with-libexpat-dir has been renamed to --with-expat and no longer
accepts a directory.
- LiteSpeed:
. --with-litespeed becomes --enable-litespeed.
- Mbstring:
. --with-onig has been removed. Unless --disable-mbregex has been passed,
libonig is required.
. --with-iodbc no longer accepts a directory.
. --with-unixODBC without directory now use pkg-config (preferred).
Directory is still accepted for old versions without libodbc.pc.
- OpenSSL:
. --with-openssl no longer accepts a directory.
. --with-kerberos no longer accepts a directory.
. --with-pcre-regex has been removed. Instead --with-external-pcre is provided
to opt into using an external PCRE library, rather than the bundled one.
- PDO_SQLite:
. --with-pdo-sqlite no longer accepts a directory.
- Readline:
. --with-libedit no longer accepts a directory.
- Sodium:
. --with-sodium no longer accepts a directory.
- SQLite3:
. --with-sqlite3 no longer accepts a directory.
- XSL:
. --with-xsl no longer accepts a directory.
- Zip:
. --with-libzip has been removed.
. --enable-zip becomes --with-zip.
14. Other Changes
- Core:
. Add zend.exception_ignore_args to force the omission of arguments from
stack traces collected for exceptions.
15. Performance Improvements
- Core:
. A specialized VM opcode for the array_key_exists() function has been added,
which improves performance of this function if it can be statically
resolved. In namespaced code, this may require writing \array_key_exists()
or explicitly importing the function.
. When preg_match() in UTF-8 mode ("u" modifier) is repeatedly called on the
same string (but possibly different offsets), it will only be checked for
UTF-8 validity once.