mirror of
https://github.com/php/php-src.git
synced 2024-11-27 11:53:33 +08:00
435 lines
14 KiB
Plaintext
435 lines
14 KiB
Plaintext
$Id$
|
|
|
|
PHP X.Y UPGRADE NOTES
|
|
|
|
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. Other Changes
|
|
|
|
|
|
========================================
|
|
1. Backward Incompatible Changes
|
|
========================================
|
|
|
|
Core
|
|
====
|
|
|
|
Changes to variable handling
|
|
----------------------------
|
|
|
|
* Indirect variable, property and method references are now interpreted with
|
|
left-to-right semantics. Some examples:
|
|
|
|
$$foo['bar']['baz'] // interpreted as ($$foo)['bar']['baz']
|
|
$foo->$bar['baz'] // interpreted as ($foo->$bar)['baz']
|
|
$foo->$bar['baz']() // interpreted as ($foo->$bar)['baz']()
|
|
Foo::$bar['baz']() // interpreted as (Foo::$bar)['baz']()
|
|
|
|
To restore the previous behavior add explicit curly braces:
|
|
|
|
${$foo['bar']['baz']}
|
|
$foo->{$bar['baz']}
|
|
$foo->{$bar['baz']}()
|
|
Foo::{$bar['baz']}()
|
|
|
|
* The global keyword now only accepts simple variables. Instead of
|
|
|
|
global $$foo->bar;
|
|
|
|
it is now required to write the following:
|
|
|
|
global ${$foo->bar};
|
|
|
|
* Parentheses around variables or function calls no longer have any influence
|
|
on behavior. For example the following code, where the result of a function
|
|
call is passed to a by-reference function
|
|
|
|
function getArray() { return [1, 2, 3]; }
|
|
|
|
$last = array_pop(getArray());
|
|
// Strict Standards: Only variables should be passed by reference
|
|
$last = array_pop((getArray()));
|
|
// Strict Standards: Only variables should be passed by reference
|
|
|
|
will now throw a strict standards error irregardless of whether parentheses
|
|
are used. Previously no notice was generated in the second case.
|
|
|
|
* Array elements or object properties that are automatically created during
|
|
by-reference assignments will now result in a different order. For example
|
|
|
|
$array = [];
|
|
$array["a"] =& $array["b"];
|
|
$array["b"] = 1;
|
|
var_dump($array);
|
|
|
|
now results in the array ["a" => 1, "b" => 1], while previously the result
|
|
was ["b" => 1, "a" => 1];
|
|
|
|
Relevant RFCs:
|
|
* https://wiki.php.net/rfc/uniform_variable_syntax
|
|
* https://wiki.php.net/rfc/abstract_syntax_tree
|
|
|
|
Changes to list()
|
|
-----------------
|
|
|
|
* list() will no longer assign variables in reverse order. For example
|
|
|
|
list($array[], $array[], $array[]) = [1, 2, 3];
|
|
var_dump($array);
|
|
|
|
will now result in $array == [1, 2, 3] rather than [3, 2, 1]. Note that only
|
|
the **order** of the assignments changed, but the assigned values stay the
|
|
same. E.g. a normal usage like
|
|
|
|
list($a, $b, $c) = [1, 2, 3];
|
|
// $a = 1; $b = 2; $c = 3;
|
|
|
|
will retain its current behavior.
|
|
|
|
* Empty list() assignments are no longer allowed. As such all of the following
|
|
are invalid:
|
|
|
|
list() = $a;
|
|
list(,,) = $a;
|
|
list($x, list(), $y) = $a;
|
|
|
|
* list() no longer supports unpacking strings (while previously this was only
|
|
supported in some cases). The code
|
|
|
|
$string = "xy";
|
|
list($x, $y) = $string;
|
|
|
|
will now result in $x == null and $y == null (without notices) instead of
|
|
$x == "x" and $y == "y". Furthermore list() is now always guaranteed to
|
|
work with objects implementing ArrayAccess, e.g.
|
|
|
|
list($a, $b) = (object) new ArrayObject([0, 1]);
|
|
|
|
will now result in $a == 0 and $b == 1. Previously both $a and $b were null.
|
|
|
|
Relevant RFCs:
|
|
* https://wiki.php.net/rfc/abstract_syntax_tree#changes_to_list
|
|
* https://wiki.php.net/rfc/fix_list_behavior_inconsistency
|
|
|
|
Changes to parameter handling
|
|
-----------------------------
|
|
|
|
* It is no longer possible to define two function parameters with the same name.
|
|
For example, the following method will trigger a compile-time error:
|
|
|
|
public function foo($a, $b, $unused, $unused) {
|
|
// ...
|
|
}
|
|
|
|
Code like this should be changed to use distinct parameter names, for example:
|
|
|
|
public function foo($a, $b, $unused1, $unused2) {
|
|
// ...
|
|
}
|
|
|
|
* The func_get_arg() and func_get_args() functions will no longer return the
|
|
original value that was passed to a parameter and will instead provide the
|
|
current value (which might have been modified). For example
|
|
|
|
function foo($x) {
|
|
$x++;
|
|
var_dump(func_get_arg(0));
|
|
}
|
|
foo(1);
|
|
|
|
will now print "2" instead of "1". This code should be changed to either
|
|
perform modifications only after calling func_get_arg(s)
|
|
|
|
function foo($x) {
|
|
var_dump(func_get_arg(0));
|
|
$x++;
|
|
}
|
|
|
|
or avoid modifying the parameters altogether:
|
|
|
|
function foo($x) {
|
|
$newX = $x + 1;
|
|
var_dump(func_get_arg(0));
|
|
}
|
|
|
|
* Similarly exception backtraces will no longer display the original value that
|
|
was passed to a function and show the modified value instead. For example
|
|
|
|
function foo($x) {
|
|
$x = 42;
|
|
throw new Exception;
|
|
}
|
|
foo("string");
|
|
|
|
will now result in the stack trace
|
|
|
|
Stack trace:
|
|
#0 file.php(4): foo(42)
|
|
#1 {main}
|
|
|
|
while previously it was:
|
|
|
|
Stack trace:
|
|
#0 file.php(4): foo('string')
|
|
#1 {main}
|
|
|
|
While this should not impact runtime behavior of your code, it is worthwhile
|
|
to be aware of this difference for debugging purposes.
|
|
|
|
The same limitation also applies to debug_backtrace() and other functions
|
|
inspecting function arguments.
|
|
|
|
Relevant RFC: https://wiki.php.net/phpng
|
|
|
|
Changes to integer handling
|
|
---------------------------
|
|
|
|
* Invalid octal literals (containing digits larger than 7) now produce compile
|
|
errors. For example, the following is no longer valid:
|
|
|
|
$i = 0781; // 8 is not a valid octal digit!
|
|
|
|
Previously the invalid digits (and any following valid digits) were simply
|
|
ignored. As such $i previously held the value 7, because the last two digits
|
|
were silently discarded.
|
|
|
|
* Bitwise shifts by negative numbers will now throw a warning and return false:
|
|
|
|
var_dump(1 >> -1); // bool(false)
|
|
// Warning: Bit shift by negative number
|
|
|
|
* Left bitwise shifts by a number of bits beyond the bit width of an integer
|
|
will always result in 0:
|
|
|
|
var_dump(1 << 64); // int(0)
|
|
|
|
Previously the behavior of this code was dependent on the used CPU
|
|
architecture. For example on x86 (including x86-64) the result was int(1),
|
|
because the shift operand was wrapped.
|
|
|
|
* Similarly right bitwise shifts by a number of bits beyond the bit width of an
|
|
integer will always result in 0 or -1 (depending on sign):
|
|
|
|
var_dump(1 >> 64); // int(0)
|
|
var_dump(-1 >> 64); // int(-1)
|
|
|
|
* Strings that contain hexadecimal numbers are no longer considered to be
|
|
numeric and don't receive special treatment anymore. Some examples of the
|
|
new behavior:
|
|
|
|
var_dump("0x123" == "291"); // bool(false) (previously true)
|
|
var_dump(is_numeric("0x123")); // bool(false) (previously true)
|
|
var_dump("0xe" + "0x1"); // int(0) (previously 16)
|
|
|
|
var_dump(substr("foo", "0x1")); // string(3) "foo" (previously "oo")
|
|
// Notice: A non well formed numeric value encountered
|
|
|
|
filter_var() can be used to check if a string contains a hexadecimal number
|
|
or convert such a string into an integer:
|
|
|
|
$str = "0xffff";
|
|
$int = filter_var($str, FILTER_VALIDATE_INT, FILTER_FLAG_ALLOW_HEX);
|
|
if (false === $int) {
|
|
throw new Exception("Invalid integer!");
|
|
}
|
|
var_dump($num); // int(65535)
|
|
|
|
Relevant RFCs:
|
|
* https://wiki.php.net/rfc/integer_semantics
|
|
* https://wiki.php.net/rfc/remove_hex_support_in_numeric_strings
|
|
|
|
Other core changes
|
|
------------------
|
|
|
|
. Removed ASP (<%) and script (<script language=php>) tags.
|
|
(RFC: https://wiki.php.net/rfc/remove_alternative_php_tags)
|
|
. call_user_method() and call_user_method_array() no longer exists.
|
|
. The addition of Unicode Codepoint Escape Syntax for double-quoted strings
|
|
and heredocs means that \u{ followed by an invalid sequence will now error.
|
|
However, \u without a following { is unaffected, so "\u202e" won't error and
|
|
will work the same as before.
|
|
. zend_function.common.num_args don't include the variadic argument anymore.
|
|
. ob_start() no longer issues an E_ERROR, but instead an E_RECOVERABLE_ERROR in case an
|
|
output buffer is created in an output buffer handler.
|
|
. Removed support for assigning the result of new by reference.
|
|
. Removed support for scoped calls to non-static methods from an incompatible
|
|
$this context. See details in https://wiki.php.net/rfc/incompat_ctx.
|
|
. Removed support for #-style comments in ini files. Use ;-style comments
|
|
instead.
|
|
. Added zend_memnstr_ex, which is based on string matching sunday algo.
|
|
. Added zend_memnrstr, zend_memnrstr_ex.
|
|
. Added hybrid sorting algo zend_sort for better performance.
|
|
. Added stable sorting algo zend_insert_sort.
|
|
. Removed dl() function on fpm-fcgi.
|
|
. $HTTP_RAW_POST_DATA is no longer available. Use the php://input stream instead.
|
|
|
|
Other
|
|
=====
|
|
|
|
- Date:
|
|
. Removed $is_dst parameter from mktime() and gmmktime().
|
|
|
|
- DBA
|
|
. dba_delete() now returns false if the key was not found for the inifile
|
|
handler, too.
|
|
|
|
- GMP
|
|
. Requires libgmp version 4.2 or newer now.
|
|
. gmp_setbit() and gmp_clrbit() now return FALSE for negative indices, making
|
|
them consistent with other GMP functions.
|
|
|
|
- Session
|
|
. session_start() accepts all INI settings as array. e.g. ['cache_limiter'=>'private']
|
|
sets session.cache_limiter=private. It also supports 'read_and_close' which closes
|
|
session data immediately after read data.
|
|
. Save handler accepts validate_sid(), update_timestamp() which validates session
|
|
ID existence, updates timestamp of session data. Compatibility of old user defined
|
|
save handler is retained.
|
|
. SessionUpdateTimestampHandlerInterface is added. validateSid(), updateTimestamp()
|
|
is defined in the interface.
|
|
. session.lazy_write(default=On) INI setting enables only write session data when
|
|
session data is updated.
|
|
|
|
- PCRE:
|
|
. Removed support for /e (PREG_REPLACE_EVAL) modifier. Use
|
|
preg_reaplace_callback() instead.
|
|
|
|
- Standard:
|
|
. Removed string category support in setlocale(). Use the LC_* constants
|
|
instead.
|
|
. Removed set_magic_quotes_runtime() and its alias magic_quotes_runtime().
|
|
|
|
- JSON:
|
|
. Rejected RFC 7159 incompatible number formats in json_decode string -
|
|
top level (07, 0xff, .1, -.1) and all levels ([1.], [1.e1])
|
|
. Empty PHP string passed to json_encode emits a JSON syntax error.
|
|
|
|
- Stream:
|
|
. Removed set_socket_blocking() in favor of its alias stream_set_blocking().
|
|
|
|
========================================
|
|
2. New Features
|
|
========================================
|
|
|
|
- Core
|
|
. Added null coalesce operator (??).
|
|
(RFC: https://wiki.php.net/rfc/isset_ternary)
|
|
. Support for strings with length >= 2^31 bytes in 64 bit builds.
|
|
. Closure::call() method added.
|
|
. Added \u{xxxxxx} Unicode Codepoint Escape Syntax for double-quoted strings
|
|
and heredocs.
|
|
. define() now supports arrays as constant values, fixing an oversight where define() did not support arrays yet const syntax did.
|
|
|
|
========================================
|
|
3. Changes in SAPI modules
|
|
========================================
|
|
|
|
- FPM
|
|
. Fixed bug #65933 (Cannot specify config lines longer than 1024 bytes).
|
|
. Listen = port now listen on all addresses (IPv6 and IPv4-mapped).
|
|
|
|
========================================
|
|
4. Deprecated Functionality
|
|
========================================
|
|
|
|
|
|
========================================
|
|
5. Changed Functions
|
|
========================================
|
|
|
|
- parse_ini_file():
|
|
- parse_ini_string():
|
|
. Added scanner mode INI_SCANNER_TYPED to yield typed .ini values.
|
|
- unserialize():
|
|
. Added second parameter for unserialize function
|
|
(RFC: https://wiki.php.net/rfc/secure_unserialize) allowing to specify
|
|
acceptable classes:
|
|
unserialize($foo, ["allowed_classes" => ["MyClass", "MyClass2"]);
|
|
|
|
|
|
========================================
|
|
6. New Functions
|
|
========================================
|
|
- GMP
|
|
. Added gmp_random_seed().
|
|
|
|
- Standard
|
|
. Added intdiv() function for integer division.
|
|
|
|
========================================
|
|
7. New Classes and Interfaces
|
|
========================================
|
|
|
|
|
|
========================================
|
|
8. Removed Extensions and SAPIs
|
|
========================================
|
|
|
|
- sapi/aolserver
|
|
- sapi/apache
|
|
- sapi/apache_hooks
|
|
- sapi/apache2filter
|
|
- sapi/caudium
|
|
- sapi/continuity
|
|
- sapi/isapi
|
|
- sapi/milter
|
|
- sapi/phttpd
|
|
- sapi/pi3web
|
|
- sapi/roxen
|
|
- sapi/thttpd
|
|
- sapi/tux
|
|
- sapi/webjames
|
|
- ext/mssql
|
|
- ext/sybase_ct
|
|
For more details see https://wiki.php.net/rfc/removal_of_dead_sapis_and_exts
|
|
|
|
========================================
|
|
9. Other Changes to Extensions
|
|
========================================
|
|
|
|
|
|
========================================
|
|
10. New Global Constants
|
|
========================================
|
|
|
|
- Core
|
|
. PHP_INT_MIN added.
|
|
|
|
========================================
|
|
11. Changes to INI File Handling
|
|
========================================
|
|
|
|
- Core
|
|
. Removed asp_tags ini directive. Trying to enable it will result in a fatal
|
|
error.
|
|
. Removed always_populate_raw_post_data ini directive.
|
|
|
|
========================================
|
|
12. Windows Support
|
|
========================================
|
|
|
|
- Core
|
|
. Support for native 64 bit integers in 64 bit builds.
|
|
. Support for large files in 64 bit builds.
|
|
|
|
========================================
|
|
13. Other Changes
|
|
========================================
|
|
|
|
- Core
|
|
. Instead of being undefined and platform-dependent, NaN and Infinity will
|
|
always be zero when casted to integer.
|
|
. Calling a method on a non-object no longer raises a fatal error; see
|
|
also: https://wiki.php.net/rfc/catchable-call-to-member-of-non-object.
|
|
. Error messages for zend_parse_parameters, type hints and conversions now always say "integer" and "float" instead of "long" and "double".
|