Although not explicitly stated in this section, every new function, class, interface, enum, or constant may cause a redeclaration Error to be thrown.
The exit() (and die()) language
constructs now behave more like a function.
This means that they can now be passed like callables,
are affected by the strict_types declare statement,
and now perform the usual type coercions instead of casting any non-integer
value to a string.
As such, passing invalid types to exit() and die() now consistently result in a TypeError being thrown.
Encountering recursion during comparison now results in an
Error exception instead of a
E_ERROR fatal error.
Indirect modification of readonly properties within __clone()
is no longer allowed, e.g. $ref = &$this->readonly.
This was already forbidden for readonly initialization, and was an
oversight in the "readonly reinitialization during cloning" implementation.
The PHP_DEBUG and PHP_ZTS
constants are now of type bool.
Previously they were of type int.
The name of uploaded files and files created by the tempnam() function are now 13 bytes longer. The total length is still platform-dependent.
The following extension class constants now declare a type on their constants:
Several resources have been migrated to objects.
Return value checks using is_resource() should be
replaced with checks for false, unless specified otherwise.
The DBA functions now accept and return
Dba\Connection objects instead of
dba_connection resources.
The ODBC functions now accept and return
Odbc\Result objects instead of
odbc_result resources.
The ODBC functions now accept and return
Odbc\Connection objects instead of
odbc_connection resources.
The SoapClient::$httpurl property is now a
Soap\Url object rather than a
soap_url resource.
Checks using is_resource() (i.e.
is_resource($client->httpurl)) should be replaced with checks
for null (i.e. $client->httpurl !== null).
The SoapClient::$sdl property is now a
Soap\Sdl object rather than a
soap_sdl resource.
Checks using is_resource() (i.e.
is_resource($client->sdl)) should be replaced with checks
for null (i.e. $client->sdl !== null).
New warnings and exceptions have been added which are triggered on programming errors, i.e. invalid values provided as arguments.
curl_multi_select() now throws a
ValueError if the
timeout parameter is less than
0 or greater than PHP_INT_MAX.
imagejpeg(), imagewebp(), imagepng(), imageavif()
now throw a ValueError when an invalid
quality is passed.
imageavif() will now throw a
ValueError if an invalid
speed parameter value is passed.
imagescale() will now throw a
ValueError if the
width or height
parameters underflows/overflows.
imagescale() will now throw a
ValueError if an invalid
mode parameter value is passed.
imagefilter() will now throw a
ValueError with the
IMG_FILTER_SCATTER filter
if the sub or plus
parameters underflows/overflows.
bind_textdomain_codeset(), textdomain(), d()*gettext()
now throw a ValueError if
domainis the empty string.
resourcebundle_get(), ResourceBundle::get(), and accessing offsets on a ResourceBundle object now throw:
IntlDateFormatter::__construct() throws a
ValueError if the
locale is invalid.
NumberFormatter::__construct() throws a
ValueError if the
locale is invalid.
mb_encode_numericentity() and
mb_decode_numericentity() now check that the
map is only composed of ints,
if not a ValueError is now thrown.
mb_http_input() now always throw a
ValueError if type
is invalid.
mb_http_output() now check that the
encoding does not contain any null bytes,
if it does a ValueError is now thrown.
odbc_fetch_row() returns false when
row is less than or equal to 0.
A warning is now emitted in this case.
The pcntl_sigprocmask(), pcntl_sigwaitinfo(), and pcntl_sigtimedwait() functions now throw:
signals array is empty
(except for pcntl_sigprocmask() if the
mode SIG_SETMASK)
signals array is not an int
signals array is not a valid signal number
The pcntl_sigprocmask() function now throws a
ValueError if the
mode is not one of SIG_BLOCK,
SIG_UNBLOCK, or SIG_SETMASK.
The pcntl_sigtimedwait() function now throw:
seconds is less than 0
nanoseconds is less than 0
or greater than 1e9
seconds and nanoseconds
are 0
Calling simplexml_import_dom() with a non-XML object now throws a TypeError instead of a ValueError.
The round() function now validates the value of the
mode and throw a
ValueError for invalid modes.
Previously, invalid modes would have been interpreted as
PHP_ROUND_HALF_UP.
The str_getcsv() now throws
ValueErrors when the
separator and enclosure
arguments are not one byte long, or if the escape
argument is not one byte long nor the empty string.
This aligns the behaviour to be identical to the one of
fputcsv() and fgetcsv().
The php_uname() function now throws a
ValueError if the
mode is invalid.
The "allowed_classes" option for
unserialize() now throws
TypeErrors and
ValueErrors if it is not an
array of class names.
Passing an invalid character encoding to XMLReader::open() or XMLReader::XML() now throws a ValueError.
Passing a string containing null bytes previously emitted a warning and now throws a ValueError.
Passing a string containing null bytes previously emitted a warning and now throws a ValueError.
XSLTProcessor::setParameter() will now throw a ValueError when its arguments contain null bytes. This never actually worked correctly in the first place, which is why it throws an exception now.
Calling XSLTProcessor::importStyleSheet() with a non-XML object now throws a TypeError instead of a ValueError.
Failure to call a PHP function callback during evaluation now throws instead of emitting a warning.
Some DOM methods previously returned false or a
PHP_ERR DOMException
if a new node could not be allocated.
They now consistently throw an INVALID_STATE_ERR
DOMException.
This situation is extremely unlikely and the probability of being affected
is low.
As a result DOMImplementation::createDocument()
now has a tentative return type of DOMDocument
instead of DOMDocument|false.
Previously, DOMXPath objects could be cloned, but resulted in an unusable object. This is no longer possible, and cloning a DOMXPath object now throws an Error.
The DOMImplementation::getFeature() method has been removed.
The GMP class is now final and cannot be extended anymore.
On invalid strings (those with encoding errors), mb_substr() now interprets character indices in the same manner as most other mbstring functions. This means that character indices returned by mb_strpos() can be passed to mb_substr().
For SJIS-Mac (MacJapanese) strings, character indices passed to mb_substr() now refer to the indices of the Unicode codepoints which are produced when the string is converted to Unicode. This is significant because around 40 SJIS-Mac characters convert to a sequence of multiple Unicode codepoints.
The unused and undocumented constant
MYSQLI_SET_CHARSET_DIR has been removed.
The MYSQLI_STMT_ATTR_PREFETCH_ROWS constant has been
removed. The feature is unavailable with mysqlnd.
The MYSQLI_CURSOR_TYPE_FOR_UPDATE and
MYSQLI_CURSOR_TYPE_SCROLLABLE constants have been
removed. This functionality was never implemented,
neither with mysqlnd nor with libmysql.
The unused MYSQLI_TYPE_INTERVAL constant, which is
currently a stub and an alias for MYSQLI_TYPE_ENUM,
has been removed.
The error code reported for MySQL server wait timeouts has been changed from
2006 to 4031 for MySQL server
versions 8.0.24 and above.
The maximum value of the
opcache.interned_strings_buffer
setting on 64bit architectures is now 32767.
Previously it was 4095.
The default configuration values for the JIT changed from
opcache.jit=tracing
and opcache.jit_buffer_size=0
to opcache.jit=disable
and opcache.jit_buffer_size=64M, respectively.
This does not affect the default observable behavior, as the JIT is still disabled by default. However, it is now disabled through the opcache.jit setting, rather than opcache.jit_buffer_size. This may affect users who previously enabled JIT through opcache.jit_buffer_size exclusively, without also specifying a JIT mode using opcache.jit. To enable JIT compilation, set the opcache.jit config value accordingly.
If JIT compilation is enabled, PHP will now exit with a fatal error on startup if the initialization of the JIT compiler failed for any reason.
The pcntl_sigprocmask(),
pcntl_sigwaitinfo(), and
pcntl_sigtimedwait() functions now always
return false on failure.
In some case previously it could return the value -1.
The bundled pcre2lib has been updated to version 10.44.
As a consequence, this means {,3} is now recognized
as a quantifier instead of as text.
Furthermore, the meaning of some character classes in UCP mode has changed.
Consult the » PCRE2 Changelog
for a full changelog.
The DBLIB_ATTR_STRINGIFY_UNIQUEIDENTIFIER and
DBLIB_ATTR_DATETIME_CONVERT attributes now act as
boolean attributes instead of integer attributes.
Thus setting the attribute via PDO::setAttribute()
and retrieving it via PDO::getAttribute() expects
and or return a bool.
The ATTR_AUTOCOMMIT attribute now act as
boolean attributes instead of integer attributes.
Thus setting the attribute via PDO::setAttribute()
and retrieving it via PDO::getAttribute() expects
and or return a bool.
The extension now exposes some Firebird C++ APIs, therefore building this extension now requires a C++ compiler. Moreover, the extension must now be compiled against fbclient 3.0 or higher.
The ATTR_AUTOCOMMIT,
ATTR_EMULATE_PREPARES, and
MYSQL_ATTR_DIRECT_QUERY attributes now act as
boolean attributes instead of integer attributes.
Thus setting the attribute via PDO::setAttribute()
and retrieving it via PDO::getAttribute() expects
and or return a bool.
The DSN's credentials, when set, are given priority over their PDO constructor counterparts, being closer to the documentation states.
SimpleXMLElement is not only a representation of an XML element, but it is also a RecursiveIterator. Prior to PHP 8.4.0, some of its methods (e.g. SimpleXMLElement::asXML() or SimpleXMLElement::getName()) and casting such instances to string would implicitly reset the iterator.
This could cause unexpected infinite loops as the iterator was rewound. For example:
<?php
$xmlString = "<root><a><b>1</b><b>2</b><b>3</b></a></root>";
$xml = simplexml_load_string($xmlString);
$nodes = $xml->a->b;
foreach ($nodes as $nodeData) {
echo "nodeData: " . $nodeData . "\n";
$xml = $nodes->asXml();
}would result in an infinite loop.
nodeData: 1 nodeData: 2 nodeData: 2 nodeData: 2 nodeData: 2 nodeData: 2 nodeData: 2 // ...
However, this behavior has now been corrected, and a SimpleXMLElement will no longer implicitly reset the iterator data, unless explicitly rewound. Meaning the previous example would now result in:
nodeData: 1 nodeData: 2 nodeData: 3
SoapClient::$typemap is now an array
rather than a resource.
Checks using is_resource() (i.e.
is_resource($client->typemap)) should be
replaced with checks for null (i.e. $client->typemap !== null).
The SOAP extension gained an optional dependency on the session extension. If PHP is built without the session extension and with the --enable-rtld-now configure flag enabled, startup errors will now occur if the SOAP extension is also used. To solve this either don't use rtld-now or load the session extension.
When using strcspn() with
characters being the empty string,
the length of the string is now returned instead of incorrectly stopping
at the first null byte.
http_build_query() now correctly handles backed enums.
stream_bucket_make_writeable() and stream_bucket_new() will now return a StreamBucket instance instead of an instance of stdClass.
Failures in the constructor now throw exceptions rather than emitting warnings and having a broken object.
The xml_set_()*_handler()
functions now declare and check for an effective
signature of callable|string|null for the
handler parameters.
Moreover, values of type string that correspond to method names,
of object set with xml_set_object() are now checked to
see if the method exists on the class of the previously passed object.
This means that xml_set_object() must now always be
called prior to setting method names as callables.
Passing an empty string to disable the handler is still allowed,
but deprecated.
However, as xml_set_object() and passing non-callable strings is deprecated. It is recommended to change such instances with a callable referring to the method directly.