diff --git a/stubs/extensions/intl.phpstub b/stubs/extensions/intl.phpstub
new file mode 100644
index 00000000000..99ead8eaeed
--- /dev/null
+++ b/stubs/extensions/intl.phpstub
@@ -0,0 +1,107 @@
+<?php
+
+/** @var string */
+const INTL_ICU_VERSION = '70.1';
+
+const INTL_MAX_LOCALE_LEN = 156;
+const IDNA_DEFAULT = 0;
+const IDNA_ALLOW_UNASSIGNED = 1;
+const IDNA_USE_STD3_RULES = 2;
+const IDNA_CHECK_BIDI = 4;
+const IDNA_CHECK_CONTEXTJ = 8;
+const IDNA_NONTRANSITIONAL_TO_ASCII = 16;
+const IDNA_NONTRANSITIONAL_TO_UNICODE = 32;
+// const INTL_IDNA_VARIANT_2003 = 0; // Listed in docs but not installed on my PHP 8.1.2 system
+const INTL_IDNA_VARIANT_UTS46 = 1;
+const IDNA_ERROR_EMPTY_LABEL = 1;
+const IDNA_ERROR_LABEL_TOO_LONG = 2;
+const IDNA_ERROR_DOMAIN_NAME_TOO_LONG = 4;
+const IDNA_ERROR_LEADING_HYPHEN = 8;
+const IDNA_ERROR_TRAILING_HYPHEN = 16;
+const IDNA_ERROR_HYPHEN_3_4 = 32;
+const IDNA_ERROR_LEADING_COMBINING_MARK = 64;
+const IDNA_ERROR_DISALLOWED = 128;
+const IDNA_ERROR_PUNYCODE = 256;
+const IDNA_ERROR_LABEL_HAS_DOT = 512;
+const IDNA_ERROR_INVALID_ACE_LABEL = 1024;
+const IDNA_ERROR_BIDI = 2048;
+const IDNA_ERROR_CONTEXTJ = 4096;
+
+class NumberFormatter
+{
+    public const PATTERN_DECIMAL = 0;
+    public const DECIMAL = 1;
+    public const CURRENCY = 2;
+    public const PERCENT = 3;
+    public const SCIENTIFIC = 4;
+    public const SPELLOUT = 5;
+    public const ORDINAL = 6;
+    public const DURATION = 7;
+    public const PATTERN_RULEBASED = 9;
+    public const IGNORE = 0;
+    /** @php-from 7.4.1 */
+    public const CURRENCY_ACCOUNTING = 12;
+    public const DEFAULT_STYLE = 1;
+    public const ROUND_CEILING = 0;
+    public const ROUND_FLOOR = 1;
+    public const ROUND_DOWN = 2;
+    public const ROUND_UP = 3;
+    public const ROUND_HALFEVEN = 4;
+    public const ROUND_HALFDOWN = 5;
+    public const ROUND_HALFUP = 6;
+    public const PAD_BEFORE_PREFIX = 0;
+    public const PAD_AFTER_PREFIX = 1;
+    public const PAD_BEFORE_SUFFIX = 2;
+    public const PAD_AFTER_SUFFIX = 3;
+    public const PARSE_INT_ONLY = 0;
+    public const GROUPING_USED = 1;
+    public const DECIMAL_ALWAYS_SHOWN = 2;
+    public const MAX_INTEGER_DIGITS = 3;
+    public const MIN_INTEGER_DIGITS = 4;
+    public const INTEGER_DIGITS = 5;
+    public const MAX_FRACTION_DIGITS = 6;
+    public const MIN_FRACTION_DIGITS = 7;
+    public const FRACTION_DIGITS = 8;
+    public const MULTIPLIER = 9;
+    public const GROUPING_SIZE = 10;
+    public const ROUNDING_MODE = 11;
+    public const ROUNDING_INCREMENT = 12;
+    public const FORMAT_WIDTH = 13;
+    public const PADDING_POSITION = 14;
+    public const SECONDARY_GROUPING_SIZE = 15;
+    public const SIGNIFICANT_DIGITS_USED = 16;
+    public const MIN_SIGNIFICANT_DIGITS = 17;
+    public const MAX_SIGNIFICANT_DIGITS = 18;
+    public const LENIENT_PARSE = 19;
+    public const POSITIVE_PREFIX = 0;
+    public const POSITIVE_SUFFIX = 1;
+    public const NEGATIVE_PREFIX = 2;
+    public const NEGATIVE_SUFFIX = 3;
+    public const PADDING_CHARACTER = 4;
+    public const CURRENCY_CODE = 5;
+    public const DEFAULT_RULESET = 6;
+    public const PUBLIC_RULESETS = 7;
+    public const DECIMAL_SEPARATOR_SYMBOL = 0;
+    public const GROUPING_SEPARATOR_SYMBOL = 1;
+    public const PATTERN_SEPARATOR_SYMBOL = 2;
+    public const PERCENT_SYMBOL = 3;
+    public const ZERO_DIGIT_SYMBOL = 4;
+    public const DIGIT_SYMBOL = 5;
+    public const MINUS_SIGN_SYMBOL = 6;
+    public const PLUS_SIGN_SYMBOL = 7;
+    public const CURRENCY_SYMBOL = 8;
+    public const INTL_CURRENCY_SYMBOL = 9;
+    public const MONETARY_SEPARATOR_SYMBOL = 10;
+    public const EXPONENTIAL_SYMBOL = 11;
+    public const PERMILL_SYMBOL = 12;
+    public const PAD_ESCAPE_SYMBOL = 13;
+    public const INFINITY_SYMBOL = 14;
+    public const NAN_SYMBOL = 15;
+    public const SIGNIFICANT_DIGIT_SYMBOL = 16;
+    public const MONETARY_GROUPING_SEPARATOR_SYMBOL = 17;
+    public const TYPE_DEFAULT = 0;
+    public const TYPE_INT32 = 1;
+    public const TYPE_INT64 = 2;
+    public const TYPE_DOUBLE = 3;
+    public const TYPE_CURRENCY = 4;
+}