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UPGRADING.INTERNALS
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UPGRADING.INTERNALS
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PHP 8.1 INTERNALS UPGRADE NOTES
1. Internal API changes
a. Removed Zend APIs
b. Zend Stream API
c. zend_get_opcode_id()
d. Removed support for "p" printf format specifier
e. ZEND_ATOL() changes
f. Non-serializable classes should use ZEND_ACC_NOT_SERIALIZABLE
g. _zend_hash_find_known_hash renamed to zend_hash_find_known_hash
2. Build system changes
a. New compiler flags
3. Module changes
a. ext/hash
b. ext/pdo
c. ext/standard
d. ext/pgsql
e. ext/pcre
========================
1. Internal API changes
========================
a. The following APIs have been removed from the Zend Engine:
- The spl_ce_Aggregate, spl_ce_ArrayAccess, spl_ce_Countable, spl_ce_Iterator, spl_ce_Serializable,
spl_ce_Stringable, spl_ce_Traversable alias class entries have been removed in favor of zend_ce_aggregate,
zend_ce_arrayaccess, zend_ce_countable, zend_ce_iterator, zend_ce_serializable, zend_ce_stringable,
zend_ce_traversable.
- The ZVAL_NEW_ARR() macro has been removed. Use array_init() or ZVAL_ARR
with zend_new_array() instead.
- The IGNORE_URL_WIN macro has been removed; it had no effect as of PHP 5.0.0.
b. Zend Stream API has been changed to use "zend_string*" instead of "char*"
- zend_file_handle.filename now is zend_string*
- zend_file_handle.free_filename is removed. Now zend_file_handle.filename is always released.
- added zend_file_handle.primary_script flag. SAPIs should set it for main executed script.
- added zend_file_handle.in_list flag, which is set when a file_handle is added into CG(open_files)
- added zend_stream_init_filename_ex() function, that takes filename as zend_string*
- the "filename" parameter of functons zend_stream_open(), php_stream_open_for_zend_ex() and
callback zend_stream_open_function() has been removed (it's now passed as a "filename" field of the
file_handle parameter)
- in zend_fopen() and zend_resolve_path() callbacks filename now passed as zend_string*
- file_handles should be destroyed by zend_destroy_file_handle() function (usually in the same function
the same function where they were created by zend_stream_init_*()). Previously there were two different
destructors zend_destroy_file_handle() and zend_file_handle_dtor().
- zend_ini_scanner_globals.filename now is zend_string*
c. Added the zend_get_opcode_id() function, which is intended to get opcode id from name.
d. Removed support for "p" modifier (%pd, %pu, etc) in PHP's printf
implementations. Use ZEND_LONG_FMT and ZEND_ULONG_FMT instead.
e. ZEND_ATOL() now returns the integer instead of assigning it as part of the
macro. Replace ZEND_ATOL(i, s) with i = ZEND_ATOL(s).
f. Non-serializable classes should be indicated using the
ZEND_ACC_NOT_SERIALIZABLE (@not-serializable in stubs) rather than the
zend_class_(un)serialize_deny handlers which are removed.
g. _zend_hash_find_known_hash has been renamed to zend_hash_find_known_hash.
========================
2. Build system changes
========================
a. New compiler flags
- [-Wimplicit-fallthrough=1] is now enabled by default.
It is possible to use the new ZEND_FALLTHROUGH macro keyword to suppress the warning.
========================
3. Module changes
========================
a. ext/hash
- The init signatures are extended with an additional `HashTable*`
argument. The passed HT is to contain the algorithm specific
configuration. If an algorithm doesn't make use of any additional
configuration, the argument is to be marked with ZEND_ATTRIBUTE_UNUSED.
b. ext/pdo
- The "preparer" callback now accepts a zend_string* instead of
char* + size_t pair the query string. Similarly, the query_string and
active_query_string members of pdo_stmt_t are now zend_string*.
- The way in which drivers provide results has changed: Previously,
the "describer" callback populated the "pdo_type" member in the
pdo_column_data structure, and the "get_col" callback then had to return
pointers to data of appropriate type.
In PHP 8.1, the "describer" callback no longer determines the pdo_type
(and this member has been removed from pdo_column_data). Instead, the
"get_col" callback accepts a zval pointer that may be populated with a
value of arbitrary type. This gives drivers more flexibility in
determining result types (e.g. based on whether a specific integer fits
the PHP integer type) and avoid awkward juggling of temporary buffers.
As the "describer" no longer determines pdo_type, the "get_column_meta"
function is now responsible for providing this information for use by
getColumnMeta(). The type provided here does not need to match the type
returned by get_col (in fact no corresponding type might exist, e.g. for
floats). It should be the closest logical equivalent for the column type.
- The transaction, set_attribute, and preparer handler's return type
has been formalized to bool instead of int.
- The check_liveness handler's return type has been formalized to zend_return
instead of int.
- The closer, and fetch_error handlers have been voidified.
- The quoter handler now returns the quoted string as zend_string* instead
of returning a boolean, and the quoted string as a pair of out params.
Similarly the unquoted string is now a zend_string* instead of a pair of
char* and size_t length.
- The doer handler now accepts a zend_string* instead of char* + size_t
pair for the SQL statement.
- The last_id handler now returns a zend_string* instead of returning a
char* and the length as an out param, and accepts a zend_string* instead
of char* for the optional sequence/table name.
- The php_pdo_str_tolower_dup() PDO_API has been removed use zend_str_tolower_dup()
or zend_string_tolower_ex().
c. ext/standard
- The PHP API php_fputcsv() now takes an extra zend_string* argument at the end
for a custom EOL sequence, passing NULL provides the old default of "\n".
d. ext/pgsql
- The functions php_pgsql_meta_data(), php_pgsql_convert(), php_pgsql_insert(),
php_pgsql_update(), php_pgsql_delete(), and php_pgsql_select() have had
their return type formalized to zend_result.
- The functions php_pgsql_meta_data(), php_pgsql_convert(), php_pgsql_insert(),
php_pgsql_update(), php_pgsql_delete(), and php_pgsql_select() now accept a
zend_string* instead of a char* for the table name.
e. ext/pcre
- Bundled PCRE2 is at version 10.37. The most important diff to the previous
version is the JIT support on the S390 platform.