--- /dev/null
+Based on the following upstream commits:
+
+https://github.com/php/php-src/commit/8d35a423838eb462cd39ee535c5d003073cc5f22
+https://github.com/php/php-src/commit/d8200e48857aeaf09f7127751efc5632ef7660a7
+https://github.com/php/php-src/commit/9a8e7b571896f39f83cb000fdb7c466b6d328d52
+
+--- a/ext/intl/breakiterator/breakiterator_class.cpp
++++ b/ext/intl/breakiterator/breakiterator_class.cpp
+@@ -38,6 +38,7 @@ extern "C" {
+ }
+
+ using PHP::CodePointBreakIterator;
++using icu::RuleBasedBreakIterator;
+
+ /* {{{ Global variables */
+ zend_class_entry *BreakIterator_ce_ptr;
+--- a/ext/intl/breakiterator/breakiterator_class.h
++++ b/ext/intl/breakiterator/breakiterator_class.h
+@@ -26,6 +26,8 @@
+
+ #ifndef USE_BREAKITERATOR_POINTER
+ typedef void BreakIterator;
++#else
++using icu::BreakIterator;
+ #endif
+
+ typedef struct {
+--- a/ext/intl/breakiterator/breakiterator_methods.cpp
++++ b/ext/intl/breakiterator/breakiterator_methods.cpp
+@@ -32,6 +32,8 @@ extern "C" {
+ }
+
+ using PHP::CodePointBreakIterator;
++using icu::BreakIterator;
++using icu::Locale;
+
+ U_CFUNC PHP_METHOD(BreakIterator, __construct)
+ {
+--- a/ext/intl/breakiterator/codepointiterator_internal.cpp
++++ b/ext/intl/breakiterator/codepointiterator_internal.cpp
+@@ -31,6 +31,8 @@ typedef union {
+
+ using namespace PHP;
+
++using icu::UCharCharacterIterator;
++
+ UOBJECT_DEFINE_RTTI_IMPLEMENTATION(CodePointBreakIterator);
+
+ CodePointBreakIterator::CodePointBreakIterator()
+--- a/ext/intl/breakiterator/codepointiterator_internal.h
++++ b/ext/intl/breakiterator/codepointiterator_internal.h
+@@ -18,8 +18,11 @@
+ #define CODEPOINTITERATOR_INTERNAL_H
+
+ #include <unicode/brkiter.h>
++#include <unicode/unistr.h>
+
+-using U_ICU_NAMESPACE::BreakIterator;
++using icu::BreakIterator;
++using icu::CharacterIterator;
++using icu::UnicodeString;
+
+ namespace PHP {
+
+--- a/ext/intl/breakiterator/rulebasedbreakiterator_methods.cpp
++++ b/ext/intl/breakiterator/rulebasedbreakiterator_methods.cpp
+@@ -25,6 +25,9 @@ extern "C" {
+
+ #include "../intl_convertcpp.h"
+
++using icu::RuleBasedBreakIterator;
++using icu::Locale;
++
+ static inline RuleBasedBreakIterator *fetch_rbbi(BreakIterator_object *bio) {
+ return (RuleBasedBreakIterator*)bio->biter;
+ }
+--- a/ext/intl/calendar/calendar_class.cpp
++++ b/ext/intl/calendar/calendar_class.cpp
+@@ -34,6 +34,9 @@ extern "C" {
+ #include <assert.h>
+ }
+
++using icu::GregorianCalendar;
++using icu::Locale;
++
+ /* {{{ Global variables */
+ zend_class_entry *Calendar_ce_ptr;
+ zend_class_entry *GregorianCalendar_ce_ptr;
+--- a/ext/intl/calendar/calendar_class.h
++++ b/ext/intl/calendar/calendar_class.h
+@@ -26,6 +26,8 @@
+
+ #ifndef USE_CALENDAR_POINTER
+ typedef void Calendar;
++#else
++using icu::Calendar;
+ #endif
+
+ typedef struct {
+--- a/ext/intl/calendar/calendar_methods.cpp
++++ b/ext/intl/calendar/calendar_methods.cpp
+@@ -40,6 +40,8 @@ extern "C" {
+ }
+ #include "../common/common_enum.h"
+
++using icu::Locale;
++
+ U_CFUNC PHP_METHOD(IntlCalendar, __construct)
+ {
+ zend_throw_exception( NULL,
+--- a/ext/intl/calendar/gregoriancalendar_methods.cpp
++++ b/ext/intl/calendar/gregoriancalendar_methods.cpp
+@@ -23,6 +23,8 @@
+ #include <unicode/locid.h>
+ #include <unicode/calendar.h>
+ #include <unicode/gregocal.h>
++#include <unicode/ustring.h>
++
+ extern "C" {
+ #include "../php_intl.h"
+ #define USE_TIMEZONE_POINTER 1
+@@ -32,6 +34,11 @@ extern "C" {
+ #include <ext/date/php_date.h>
+ }
+
++using icu::GregorianCalendar;
++using icu::Locale;
++using icu::UnicodeString;
++using icu::StringPiece;
++
+ static inline GregorianCalendar *fetch_greg(Calendar_object *co) {
+ return (GregorianCalendar*)co->ucal;
+ }
+--- a/ext/intl/common/common_date.cpp
++++ b/ext/intl/common/common_date.cpp
+@@ -25,6 +25,9 @@ extern "C" {
+ #include <ext/date/php_date.h>
+ }
+
++using icu::TimeZone;
++using icu::UnicodeString;
++
+ #ifndef INFINITY
+ #define INFINITY (DBL_MAX+DBL_MAX)
+ #endif
+--- a/ext/intl/common/common_date.h
++++ b/ext/intl/common/common_date.h
+@@ -28,6 +28,8 @@ U_CDECL_END
+
+ #include <unicode/timezone.h>
+
++using icu::TimeZone;
++
+ U_CFUNC TimeZone *timezone_convert_datetimezone(int type, void *object, int is_datetime, intl_error *outside_error, const char *func TSRMLS_DC);
+ U_CFUNC int intl_datetime_decompose(zval *z, double *millis, TimeZone **tz,
+ intl_error *err, const char *func TSRMLS_DC);
+--- a/ext/intl/common/common_enum.h
++++ b/ext/intl/common/common_enum.h
+@@ -69,6 +69,7 @@ U_CFUNC void zoi_with_current_get_current_data(zend_object_iterator *iter, zval
+ U_CFUNC void zoi_with_current_invalidate_current(zend_object_iterator *iter TSRMLS_DC);
+
+ #ifdef __cplusplus
++using icu::StringEnumeration;
+ U_CFUNC void IntlIterator_from_StringEnumeration(StringEnumeration *se, zval *object TSRMLS_DC);
+ #endif
+
+--- a/ext/intl/converter/converter.c
++++ b/ext/intl/converter/converter.c
+@@ -18,6 +18,8 @@
+ #include "zend_exceptions.h"
+
+ #include <unicode/utypes.h>
++#include <unicode/utf8.h>
++#include <unicode/utf16.h>
+ #include <unicode/ucnv.h>
+ #include <unicode/ustring.h>
+
+--- a/ext/intl/dateformat/dateformat_format_object.cpp
++++ b/ext/intl/dateformat/dateformat_format_object.cpp
+@@ -33,6 +33,12 @@ extern "C" {
+ #include "../common/common_date.h"
+ }
+
++using icu::Locale;
++using icu::DateFormat;
++using icu::GregorianCalendar;
++using icu::StringPiece;
++using icu::SimpleDateFormat;
++
+ static const DateFormat::EStyle valid_styles[] = {
+ DateFormat::kNone,
+ DateFormat::kFull,
+--- a/ext/intl/dateformat/dateformat_helpers.cpp
++++ b/ext/intl/dateformat/dateformat_helpers.cpp
+@@ -28,6 +28,8 @@ extern "C" {
+ #include "../calendar/calendar_class.h"
+ }
+
++using icu::GregorianCalendar;
++
+ int datefmt_process_calendar_arg(zval* calendar_zv,
+ Locale const& locale,
+ const char *func_name,
+--- a/ext/intl/dateformat/dateformat_helpers.h
++++ b/ext/intl/dateformat/dateformat_helpers.h
+@@ -22,11 +22,16 @@
+ #endif
+
+ #include <unicode/calendar.h>
++#include <unicode/datefmt.h>
+
+ extern "C" {
+ #include "../php_intl.h"
+ }
+
++using icu::Locale;
++using icu::Calendar;
++using icu::DateFormat;
++
+ int datefmt_process_calendar_arg(zval* calendar_zv,
+ Locale const& locale,
+ const char *func_name,
+--- a/ext/intl/grapheme/grapheme_string.c
++++ b/ext/intl/grapheme/grapheme_string.c
+@@ -24,6 +24,7 @@
+ #include "grapheme_util.h"
+
+ #include <unicode/utypes.h>
++#include <unicode/utf8.h>
+ #include <unicode/ucol.h>
+ #include <unicode/ustring.h>
+ #include <unicode/ubrk.h>
+@@ -860,10 +861,10 @@ PHP_FUNCTION(grapheme_extract)
+ pstr = str + start;
+
+ /* just in case pstr points in the middle of a character, move forward to the start of the next char */
+- if ( !UTF8_IS_SINGLE(*pstr) && !U8_IS_LEAD(*pstr) ) {
++ if ( !U8_IS_SINGLE(*pstr) && !U8_IS_LEAD(*pstr) ) {
+ unsigned char *str_end = str + str_len;
+
+- while ( !UTF8_IS_SINGLE(*pstr) && !U8_IS_LEAD(*pstr) ) {
++ while ( !U8_IS_SINGLE(*pstr) && !U8_IS_LEAD(*pstr) ) {
+ pstr++;
+ if ( pstr >= str_end ) {
+ intl_error_set( NULL, U_ILLEGAL_ARGUMENT_ERROR,
+--- a/ext/intl/intl_convertcpp.h
++++ b/ext/intl/intl_convertcpp.h
+@@ -25,6 +25,8 @@
+
+ #include <unicode/unistr.h>
+
++using icu::UnicodeString;
++
+ int intl_stringFromChar(UnicodeString &ret, char *str, int32_t str_len, UErrorCode *status);
+
+ int intl_charFromString(const UnicodeString &from, char **res, int *res_len, UErrorCode *status);
+--- a/ext/intl/msgformat/msgformat_helpers.cpp
++++ b/ext/intl/msgformat/msgformat_helpers.cpp
+@@ -76,6 +76,16 @@ MessageFormatAdapter::getMessagePattern(MessageFormat* m) {
+ #endif
+ U_NAMESPACE_END
+
++using icu::Formattable;
++using icu::Format;
++using icu::DateFormat;
++using icu::MessageFormat;
++#ifdef HAS_MESSAGE_PATTERN
++using icu::MessagePattern;
++#endif
++using icu::MessageFormatAdapter;
++using icu::FieldPosition;
++
+ U_CFUNC int32_t umsg_format_arg_count(UMessageFormat *fmt)
+ {
+ int32_t fmt_count = 0;
+@@ -227,15 +237,16 @@ static HashTable *umsg_parse_format(MessageFormatter_object *mfo,
+ UnicodeString typeString = mp.getSubstring(type_part);
+ /* This is all based on the rules in the docs for MessageFormat
+ * @see http://icu-project.org/apiref/icu4c/classMessageFormat.html */
+- if (typeString == "number") {
++#define ASCII_LITERAL(s) UNICODE_STRING(s, sizeof(s)-1)
++ if (typeString == ASCII_LITERAL("number")) {
+ MessagePattern::Part style_part = mp.getPart(i + 1); /* Not advancing i */
+ if (style_part.getType() == UMSGPAT_PART_TYPE_ARG_STYLE) {
+ UnicodeString styleString = mp.getSubstring(style_part);
+- if (styleString == "integer") {
++ if (styleString == ASCII_LITERAL("integer")) {
+ type = Formattable::kInt64;
+- } else if (styleString == "currency") {
++ } else if (styleString == ASCII_LITERAL("currency")) {
+ type = Formattable::kDouble;
+- } else if (styleString == "percent") {
++ } else if (styleString == ASCII_LITERAL("percent")) {
+ type = Formattable::kDouble;
+ } else { /* some style invalid/unknown to us */
+ type = Formattable::kDouble;
+@@ -243,12 +254,13 @@ static HashTable *umsg_parse_format(MessageFormatter_object *mfo,
+ } else { // if missing style, part, make it a double
+ type = Formattable::kDouble;
+ }
+- } else if ((typeString == "date") || (typeString == "time")) {
++ } else if ((typeString == ASCII_LITERAL("date")) || (typeString == ASCII_LITERAL("time"))) {
+ type = Formattable::kDate;
+- } else if ((typeString == "spellout") || (typeString == "ordinal")
+- || (typeString == "duration")) {
++ } else if ((typeString == ASCII_LITERAL("spellout")) || (typeString == ASCII_LITERAL("ordinal"))
++ || (typeString == ASCII_LITERAL("duration"))) {
+ type = Formattable::kDouble;
+ }
++#undef ASCII_LITERAL
+ } else {
+ /* If there's no UMSGPAT_PART_TYPE_ARG_TYPE right after a
+ * UMSGPAT_ARG_TYPE_SIMPLE argument, then the pattern
+--- a/ext/intl/normalizer/normalizer_normalize.c
++++ b/ext/intl/normalizer/normalizer_normalize.c
+@@ -24,6 +24,7 @@
+ #include "normalizer_class.h"
+ #include "normalizer_normalize.h"
+ #include "intl_convert.h"
++#include <unicode/utf8.h>
+
+ /* {{{ proto string Normalizer::normalize( string $input [, string $form = FORM_C] )
+ * Normalize a string. }}} */
+--- a/ext/intl/timezone/timezone_class.cpp
++++ b/ext/intl/timezone/timezone_class.cpp
+@@ -37,6 +37,8 @@ extern "C" {
+ #include <ext/date/php_date.h>
+ }
+
++using icu::Calendar;
++
+ /* {{{ Global variables */
+ U_CDECL_BEGIN
+ zend_class_entry *TimeZone_ce_ptr = NULL;
+--- a/ext/intl/timezone/timezone_class.h
++++ b/ext/intl/timezone/timezone_class.h
+@@ -29,6 +29,8 @@
+
+ #ifndef USE_TIMEZONE_POINTER
+ typedef void TimeZone;
++#else
++using icu::TimeZone;
+ #endif
+
+ typedef struct {
+--- a/ext/intl/timezone/timezone_methods.cpp
++++ b/ext/intl/timezone/timezone_methods.cpp
+@@ -23,6 +23,7 @@
+ #include <unicode/locid.h>
+ #include <unicode/timezone.h>
+ #include <unicode/ustring.h>
++#include <unicode/calendar.h>
+ #include "intl_convertcpp.h"
+
+ #include "../common/common_date.h"
+@@ -37,6 +38,9 @@ extern "C" {
+ }
+ #include "common/common_enum.h"
+
++using icu::Locale;
++using icu::Calendar;
++
+ U_CFUNC PHP_METHOD(IntlTimeZone, __construct)
+ {
+ zend_throw_exception( NULL,
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