diff --git a/reference/array/functions/array-all.xml b/reference/array/functions/array-all.xml
index e3329d12cc8..9316b851f88 100644
--- a/reference/array/functions/array-all.xml
+++ b/reference/array/functions/array-all.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<!-- EN-Revision: 596c11440dc232b8ed1836d7e3afe2ed5b225a7b Maintainer: KentarouTakeda Status: ready -->
+<!-- EN-Revision: 679cf93fa1e54cde82fc9cf545966eb13bcb0638 Maintainer: KentarouTakeda Status: ready -->
 <!-- CREDITS: KentarouTakeda -->
 <refentry xml:id="function.array-all" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
@@ -11,7 +11,7 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <type>mixed</type><methodname>array_all</methodname>
+   <type>bool</type><methodname>array_all</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
    <methodparam><type>callable</type><parameter>callback</parameter></methodparam>
   </methodsynopsis>
diff --git a/reference/array/functions/array-any.xml b/reference/array/functions/array-any.xml
index 9d9184b52ec..449df10a0bb 100644
--- a/reference/array/functions/array-any.xml
+++ b/reference/array/functions/array-any.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<!-- EN-Revision: 596c11440dc232b8ed1836d7e3afe2ed5b225a7b Maintainer: KentarouTakeda Status: ready -->
+<!-- EN-Revision: 679cf93fa1e54cde82fc9cf545966eb13bcb0638 Maintainer: KentarouTakeda Status: ready -->
 <!-- CREDITS: KentarouTakeda -->
 <refentry xml:id="function.array-any" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
@@ -11,7 +11,7 @@
  <refsect1 role="description">
   &reftitle.description;
   <methodsynopsis>
-   <type>mixed</type><methodname>array_any</methodname>
+   <type>bool</type><methodname>array_any</methodname>
    <methodparam><type>array</type><parameter>array</parameter></methodparam>
    <methodparam><type>callable</type><parameter>callback</parameter></methodparam>
   </methodsynopsis>
diff --git a/reference/fileinfo/finfo/set-flags.xml b/reference/fileinfo/finfo/set-flags.xml
index 614602900c6..0d8fe336337 100644
--- a/reference/fileinfo/finfo/set-flags.xml
+++ b/reference/fileinfo/finfo/set-flags.xml
@@ -1,41 +1,41 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- $Revision$ -->
-<!-- EN-Revision: 1160ec4e7d21a2619e9661d6afe3a6356267c6c2 Maintainer: satoruyoshida Status: ready -->
-<!-- Credits: mumumu -->
-<refentry xml:id="finfo.set-flags" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
- <refnamediv>
-  <refname>finfo::set_flags</refname>
-  <refpurpose><link linkend="function.finfo-set-flags">finfo_set_flags()</link> &Alias;</refpurpose>
- </refnamediv>
-
- <refsect1 role="description">
-  &reftitle.description;
-  <methodsynopsis role="finfo">
-   <modifier>public</modifier> <type>bool</type><methodname>finfo::set_flags</methodname>
-   <methodparam><type>int</type><parameter>flags</parameter></methodparam>
-  </methodsynopsis>
-  <para>
-   &info.function.alias; <link linkend="function.finfo-set-flags">finfo_set_flags()</link>
-  </para>
- </refsect1>
-</refentry>
-<!-- Keep this comment at the end of the file
-Local variables:
-mode: sgml
-sgml-omittag:t
-sgml-shorttag:t
-sgml-minimize-attributes:nil
-sgml-always-quote-attributes:t
-sgml-indent-step:1
-sgml-indent-data:t
-indent-tabs-mode:nil
-sgml-parent-document:nil
-sgml-default-dtd-file:"~/.phpdoc/manual.ced"
-sgml-exposed-tags:nil
-sgml-local-catalogs:nil
-sgml-local-ecat-files:nil
-End:
-vim600: syn=xml fen fdm=syntax fdl=2 si
-vim: et tw=78 syn=sgml
-vi: ts=1 sw=1
--->
+<?xml version="1.0" encoding="utf-8"?>
+<!-- $Revision$ -->
+<!-- EN-Revision: 679cf93fa1e54cde82fc9cf545966eb13bcb0638 Maintainer: satoruyoshida Status: ready -->
+<!-- Credits: mumumu -->
+<refentry xml:id="finfo.set-flags" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
+ <refnamediv>
+  <refname>finfo::set_flags</refname>
+  <refpurpose><link linkend="function.finfo-set-flags">finfo_set_flags()</link> &Alias;</refpurpose>
+ </refnamediv>
+
+ <refsect1 role="description">
+  &reftitle.description;
+  <methodsynopsis role="finfo">
+   <modifier>public</modifier> <type>true</type><methodname>finfo::set_flags</methodname>
+   <methodparam><type>int</type><parameter>flags</parameter></methodparam>
+  </methodsynopsis>
+  <para>
+   &info.function.alias; <link linkend="function.finfo-set-flags">finfo_set_flags()</link>
+  </para>
+ </refsect1>
+</refentry>
+<!-- Keep this comment at the end of the file
+Local variables:
+mode: sgml
+sgml-omittag:t
+sgml-shorttag:t
+sgml-minimize-attributes:nil
+sgml-always-quote-attributes:t
+sgml-indent-step:1
+sgml-indent-data:t
+indent-tabs-mode:nil
+sgml-parent-document:nil
+sgml-default-dtd-file:"~/.phpdoc/manual.ced"
+sgml-exposed-tags:nil
+sgml-local-catalogs:nil
+sgml-local-ecat-files:nil
+End:
+vim600: syn=xml fen fdm=syntax fdl=2 si
+vim: et tw=78 syn=sgml
+vi: ts=1 sw=1
+-->
diff --git a/reference/fileinfo/functions/finfo-set-flags.xml b/reference/fileinfo/functions/finfo-set-flags.xml
index 16d9333f21e..4e284f67c67 100644
--- a/reference/fileinfo/functions/finfo-set-flags.xml
+++ b/reference/fileinfo/functions/finfo-set-flags.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<!-- EN-Revision: db22a7cfcbc3af221f67e228336ac3e2d62aaf2c Maintainer: takagi Status: ready -->
+<!-- EN-Revision: 679cf93fa1e54cde82fc9cf545966eb13bcb0638 Maintainer: takagi Status: ready -->
 <refentry xml:id="function.finfo-set-flags" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>finfo_set_flags</refname>
@@ -17,7 +17,7 @@
   </methodsynopsis>
   <para>&style.oop;</para>
   <methodsynopsis role="finfo">
-   <modifier>public</modifier> <type>bool</type><methodname>finfo::set_flags</methodname>
+   <modifier>public</modifier> <type>true</type><methodname>finfo::set_flags</methodname>
    <methodparam><type>int</type><parameter>flags</parameter></methodparam>
   </methodsynopsis>
 
diff --git a/reference/gettext/functions/bind-textdomain-codeset.xml b/reference/gettext/functions/bind-textdomain-codeset.xml
index 5d0f3a4dadf..d1042f29529 100644
--- a/reference/gettext/functions/bind-textdomain-codeset.xml
+++ b/reference/gettext/functions/bind-textdomain-codeset.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<!-- EN-Revision: a4fd6e61bdde94db011541268e6ff2738ac1ab9f Maintainer: hirokawa Status: ready -->
+<!-- EN-Revision: 679cf93fa1e54cde82fc9cf545966eb13bcb0638 Maintainer: hirokawa Status: ready -->
 <!-- Credits: mumumu,jdkfx -->
 <refentry xml:id="function.bind-textdomain-codeset" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
@@ -13,7 +13,7 @@
   <methodsynopsis>
    <type class="union"><type>string</type><type>false</type></type><methodname>bind_textdomain_codeset</methodname>
    <methodparam><type>string</type><parameter>domain</parameter></methodparam>
-   <methodparam><type class="union"><type>string</type><type>null</type></type><parameter>codeset</parameter></methodparam>
+   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>codeset</parameter><initializer>&null;</initializer></methodparam>
   </methodsynopsis>
   <para>
    <function>bind_textdomain_codeset</function> を使用することで、
@@ -81,6 +81,13 @@
        <exceptionname>ValueError</exceptionname> をスローするようになりました。
       </entry>
      </row>
+     <row>
+      <entry>8.4.0</entry>
+      <entry>
+       <parameter>codeset</parameter> パラメータが任意になりました。
+       これより前のバージョンでは、常に指定しなければなりませんでした。
+      </entry>
+     </row>
      <row>
       <entry>8.0.3</entry>
       <entry>
diff --git a/reference/gettext/functions/bindtextdomain.xml b/reference/gettext/functions/bindtextdomain.xml
index 2b2321f3371..94ea56cec9d 100644
--- a/reference/gettext/functions/bindtextdomain.xml
+++ b/reference/gettext/functions/bindtextdomain.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<!-- EN-Revision: f456b5951e08d9c010e9717b2a7f7009a46ae5d8 Maintainer: hirokawa Status: ready -->
+<!-- EN-Revision: 679cf93fa1e54cde82fc9cf545966eb13bcb0638 Maintainer: hirokawa Status: ready -->
 <refentry xml:id="function.bindtextdomain" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>bindtextdomain</refname>
@@ -12,7 +12,7 @@
   <methodsynopsis>
    <type class="union"><type>string</type><type>false</type></type><methodname>bindtextdomain</methodname>
    <methodparam><type>string</type><parameter>domain</parameter></methodparam>
-   <methodparam><type class="union"><type>string</type><type>null</type></type><parameter>directory</parameter></methodparam>
+   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>directory</parameter><initializer>&null;</initializer></methodparam>
   </methodsynopsis>
   <para>
    <function>bindtextdomain</function> 関数は、ドメインへのパスを取得/設定します。
@@ -64,6 +64,13 @@
      </row>
     </thead>
     <tbody>
+     <row>
+      <entry>8.4.0</entry>
+      <entry>
+       <parameter>directory</parameter> パラメータが任意になりました。
+       これより前のバージョンでは、常に指定しなければなりませんでした。
+      </entry>
+     </row>
      <row>
       <entry>8.0.3</entry>
       <entry>
diff --git a/reference/gettext/functions/textdomain.xml b/reference/gettext/functions/textdomain.xml
index 38ef6d9b102..d3b9af8df0d 100644
--- a/reference/gettext/functions/textdomain.xml
+++ b/reference/gettext/functions/textdomain.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
 <!-- splitted from ./ja/functions/gettext.xml, last change in rev 1.2 -->
-<!-- EN-Revision: a4fd6e61bdde94db011541268e6ff2738ac1ab9f Maintainer: hirokawa Status: ready -->
+<!-- EN-Revision: 679cf93fa1e54cde82fc9cf545966eb13bcb0638 Maintainer: hirokawa Status: ready -->
 <refentry xml:id="function.textdomain" xmlns="http://docbook.org/ns/docbook">
  <refnamediv>
   <refname>textdomain</refname>
@@ -11,7 +11,7 @@
   &reftitle.description;
   <methodsynopsis>
    <type>string</type><methodname>textdomain</methodname>
-   <methodparam><type>string</type><parameter>text_domain</parameter><initializer>&null;</initializer></methodparam>
+   <methodparam choice="opt"><type class="union"><type>string</type><type>null</type></type><parameter>domain</parameter><initializer>&null;</initializer></methodparam>
   </methodsynopsis>
   <para>
    この関数は、<function>gettext</function> がコールされた際に検索を
@@ -71,6 +71,13 @@
        <exceptionname>ValueError</exceptionname> をスローするようになりました。
       </entry>
      </row>
+     <row>
+      <entry>8.4.0</entry>
+      <entry>
+       <parameter>domain</parameter> パラメータが任意になりました。
+       これより前のバージョンでは、常に指定しなければなりませんでした。
+      </entry>
+     </row>
     </tbody>
    </tgroup>
   </informaltable>
diff --git a/reference/intl/collator/set-strength.xml b/reference/intl/collator/set-strength.xml
index 1dd48cd2aa7..7e443aa9b30 100644
--- a/reference/intl/collator/set-strength.xml
+++ b/reference/intl/collator/set-strength.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<!-- EN-Revision: 8eec6fe5573d8de8fa65ac04974c8b637d832753 Maintainer: takagi Status: ready -->
+<!-- EN-Revision: 679cf93fa1e54cde82fc9cf545966eb13bcb0638 Maintainer: takagi Status: ready -->
 <refentry xml:id="collator.setstrength" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <refnamediv>
   <refname>Collator::setStrength</refname>
@@ -14,14 +14,14 @@
    &style.oop;
   </para>
   <methodsynopsis role="Collator">
-   <modifier>public</modifier> <type>bool</type><methodname>Collator::setStrength</methodname>
+   <modifier>public</modifier> <type>true</type><methodname>Collator::setStrength</methodname>
    <methodparam><type>int</type><parameter>strength</parameter></methodparam>
   </methodsynopsis>
   <para>
    &style.procedural;
   </para>
   <methodsynopsis>
-   <type>bool</type><methodname>collator_set_strength</methodname>
+   <type>true</type><methodname>collator_set_strength</methodname>
    <methodparam><type>Collator</type><parameter>object</parameter></methodparam>
    <methodparam><type>int</type><parameter>strength</parameter></methodparam>
   </methodsynopsis>
@@ -189,7 +189,7 @@
  <refsect1 role="returnvalues">
   &reftitle.returnvalues;
   <para>
-   &return.success;
+   &return.true.always;
   </para>
  </refsect1>
 
diff --git a/reference/intl/locale/set-default.xml b/reference/intl/locale/set-default.xml
index 6ce3644cf28..d6c45cb1b56 100644
--- a/reference/intl/locale/set-default.xml
+++ b/reference/intl/locale/set-default.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- $Revision$ -->
-<!-- EN-Revision: 1976eae0d815797af97a1e16c5cd90ffc2868395 Maintainer: takagi Status: ready -->
+<!-- EN-Revision: 679cf93fa1e54cde82fc9cf545966eb13bcb0638 Maintainer: takagi Status: ready -->
 <!-- Credits: mumumu -->
 <refentry xml:id="locale.setdefault" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <refnamediv>
@@ -15,14 +15,14 @@
    &style.oop;
   </para>
   <methodsynopsis role="Locale">
-   <modifier>public</modifier> <modifier>static</modifier> <type>bool</type><methodname>Locale::setDefault</methodname>
+   <modifier>public</modifier> <modifier>static</modifier> <type>true</type><methodname>Locale::setDefault</methodname>
    <methodparam><type>string</type><parameter>locale</parameter></methodparam>
   </methodsynopsis>
   <para>
    &style.procedural;
   </para>
   <methodsynopsis>
-   <type>bool</type><methodname>locale_set_default</methodname>
+   <type>true</type><methodname>locale_set_default</methodname>
    <methodparam><type>string</type><parameter>locale</parameter></methodparam>
   </methodsynopsis>
   <para>