diff --git a/reference/intl/grapheme/grapheme-levenshtein.xml b/reference/intl/grapheme/grapheme-levenshtein.xml
new file mode 100644
index 000000000000..85adc133b010
--- /dev/null
+++ b/reference/intl/grapheme/grapheme-levenshtein.xml
@@ -0,0 +1,117 @@
+
+
+
+
+ grapheme_levenshtein
+ Calculate the Levenshtein distance between two strings in grapheme units
+
+
+ &reftitle.description;
+ &style.procedural;
+
+ intfalsegrapheme_levenshtein
+ stringstring1
+ stringstring2
+ intcost_ins1
+ intcost_rep1
+ intcost_del1
+ stringlocale""
+
+
+ Calculates the Levenshtein distance between two strings, where the distance
+ is measured in grapheme units rather than bytes or characters.
+
+
+
+
+ &reftitle.parameters;
+
+
+ string1
+
+
+ One of the strings being evaluated for Levenshtein distance.
+ Must be valid UTF-8.
+
+
+
+
+ string2
+
+
+ One of the strings being evaluated for Levenshtein distance.
+ Must be valid UTF-8.
+
+
+
+
+ cost_ins
+
+
+ Defines the cost of insertion.
+
+
+
+
+ cost_rep
+
+
+ Defines the cost of replacement.
+
+
+
+
+ cost_del
+
+
+ Defines the cost of deletion.
+
+
+
+
+ locale
+
+ &intl.param.grapheme.locale;
+
+
+
+
+
+
+ &reftitle.returnvalues;
+
+ This function returns the Levenshtein-Distance between the two argument
+ strings (in grapheme units), or &false; if one of the argument strings is
+ longer than the limit of 255 grapheme units.
+
+
+
+
+ &reftitle.seealso;
+
+ levenshtein
+ grapheme_strlen
+
+
+
+
+
diff --git a/reference/intl/locale.xml b/reference/intl/locale.xml
index 3ecb571c876a..570c4d72c1c4 100644
--- a/reference/intl/locale.xml
+++ b/reference/intl/locale.xml
@@ -177,6 +177,14 @@
+
+ 8.5.0
+
+ Locale methods now throw a
+ ValueError when a locale argument
+ contains null bytes.
+
+
8.4.0
diff --git a/reference/intl/locale/add-likely-subtags.xml b/reference/intl/locale/add-likely-subtags.xml
new file mode 100644
index 000000000000..355a0ce770f3
--- /dev/null
+++ b/reference/intl/locale/add-likely-subtags.xml
@@ -0,0 +1,88 @@
+
+
+
+
+ Locale::addLikelySubtags
+ locale_add_likely_subtags
+ Add likely subtags to a locale
+
+
+
+ &reftitle.description;
+
+ &style.oop;
+
+
+ public static stringfalseLocale::addLikelySubtags
+ stringlocale
+
+
+ &style.procedural;
+
+
+ stringfalselocale_add_likely_subtags
+ stringlocale
+
+
+ Expands a locale tag by adding likely subtags based on the ICU locale data.
+ For example, en becomes en_Latn_US.
+
+
+
+
+ &reftitle.parameters;
+
+
+ locale
+
+
+ The locale to expand.
+
+
+
+
+
+
+
+ &reftitle.returnvalues;
+
+ Returns the locale with likely subtags added, or &false; on failure.
+
+
+
+
+ &reftitle.errors;
+
+ Throws a ValueError when the locale
+ argument contains null bytes.
+
+
+
+
+ &reftitle.seealso;
+
+ Locale::minimizeSubtags
+
+
+
+
+
diff --git a/reference/intl/locale/minimize-subtags.xml b/reference/intl/locale/minimize-subtags.xml
new file mode 100644
index 000000000000..acf57673ac9d
--- /dev/null
+++ b/reference/intl/locale/minimize-subtags.xml
@@ -0,0 +1,89 @@
+
+
+
+
+ Locale::minimizeSubtags
+ locale_minimize_subtags
+ Remove likely subtags from a locale
+
+
+
+ &reftitle.description;
+
+ &style.oop;
+
+
+ public static stringfalseLocale::minimizeSubtags
+ stringlocale
+
+
+ &style.procedural;
+
+
+ stringfalselocale_minimize_subtags
+ stringlocale
+
+
+ Minimizes a locale tag by removing subtags that can be inferred using the
+ ICU likely subtag data. For example, en_Latn_US becomes
+ en.
+
+
+
+
+ &reftitle.parameters;
+
+
+ locale
+
+
+ The locale to minimize.
+
+
+
+
+
+
+
+ &reftitle.returnvalues;
+
+ Returns the locale with likely subtags removed, or &false; on failure.
+
+
+
+
+ &reftitle.errors;
+
+ Throws a ValueError when the locale
+ argument contains null bytes.
+
+
+
+
+ &reftitle.seealso;
+
+ Locale::addLikelySubtags
+
+
+
+
+