Migration80/deprecated-Phpdoc专题

PHP 8.0 废弃的功能

PHP 核心中废弃的功能

如果带有默认值的参数后面跟着一个必要的参数，那么默认值就会无效。这在 PHP 8.0.0 中已被废弃，通常可以通过删除默认值，不影响现有功能：
```
<?php
function test($a = [], $b) {} // 之前
function test($a, $b) {} // 之后
?>
```
这条规则的一个例外是 Type $param = null 形式的参数，其中 null 的默认值使得类型隐式为空。这种用法仍然是允许的，但仍建议使用显式可空类型。
```
<?php
function test(A $a = null, $b) {} // 旧写法，仍可用
function test(?A $a, $b) {} // 推荐写法
?>
```
Calling get_defined_functions with exclude_disabled explicitly set to false is deprecated and no longer has an effect. get_defined_functions will never include disabled functions.

Enchant

enchant_broker_set_dict_path and enchant_broker_get_dict_path are deprecated, because that functionality is neither available in libenchant \< 1.5 nor in libenchant-2.
enchant_dict_add_to_personal is deprecated; use enchant_dict_add instead.
enchant_dict_is_in_session is deprecated; use enchant_dict_is_added instead.
enchant_broker_free and enchant_broker_free_dict are deprecated; unset the object instead.
The ENCHANT_MYSPELL and ENCHANT_ISPELL constants are deprecated.

LibXML

libxml_disable_entity_loader has been deprecated. As libxml 2.9.0 is now required, external entity loading is guaranteed to be disabled by default, and this function is no longer needed to protect against XXE attacks.

PGSQL / PDO PGSQL

The constant PG_VERSION_STR now has the same value as PG_VERSION, and thus is deprecated.
Function aliases in the pgsql extension have been deprecated. See the following list for which functions should be used instead:
- pg_errormessage → pg_last_error
- pg_numrows → pg_num_rows
- pg_numfields → pg_num_fields
- pg_cmdtuples → pg_affected_rows
- pg_fieldname → pg_field_name
- pg_fieldsize → pg_field_size
- pg_fieldtype → pg_field_type
- pg_fieldnum → pg_field_num
- pg_result → pg_fetch_result
- pg_fieldprtlen → pg_field_prtlen
- pg_fieldisnull → pg_field_is_null
- pg_freeresult → pg_free_result
- pg_getlastoid → pg_last_oid
- pg_locreate → pg_lo_create
- pg_lounlink → pg_lo_unlink
- pg_loopen → pg_lo_open
- pg_loclose → pg_lo_close
- pg_loread → pg_lo_read
- pg_lowrite → pg_lo_write
- pg_loreadall → pg_lo_read_all
- pg_loimport → pg_lo_import
- pg_loexport → pg_lo_export
- pg_setclientencoding → pg_set_client_encoding
- pg_clientencoding -> pg_client_encoding

Standard Library

Sort comparison functions that return true or false will now throw a deprecation warning, and should be replaced with an implementation that returns an integer less than, equal to, or greater than zero.
```
<?php
// Replace
usort($array, fn($a, $b) => $a > $b);
// With
usort($array, fn($a, $b) => $a <=> $b);
?>
```

Zip

Using an empty file as ZipArchive is deprecated. Libzip 1.6.0 does not accept empty files as valid zip archives any longer. The existing workaround will be removed in the next version.

The procedural API of Zip is deprecated. Use ZipArchive instead. Iteration over all entries can be accomplished using ZipArchive::statIndex and a for loop:

<?php
// iterate using the procedural API
assert(is_resource($zip));
while ($entry = zip_read($zip)) {
    echo zip_entry_name($entry);
}

// iterate using the object-oriented API
assert($zip instanceof ZipArchive);
for ($i = 0; $entry = $zip->statIndex($i); $i++) {
    echo $entry['name'];
}
?>

Reflection

ReflectionFunction::isDisabled is deprecated, as it is no longer possible to create a ReflectionFunction for a disabled function. This method now always returns false.
ReflectionParameter::getClass, ReflectionParameter::isArray, and ReflectionParameter::isCallable are deprecated. ReflectionParameter::getType and the ReflectionType APIs should be used instead.