PurHur · Jul 7, 2026 · Jul 7, 2026
diff --git a/ext/standard/BuiltinIntrospectionPolicy.php b/ext/standard/BuiltinIntrospectionPolicy.php
@@ -29,6 +29,9 @@ public static function functionIsAdvertised(string $functionName): bool
         if ('crc32c' === $lc) {
             return CompilerVersion::advertisesCrc32c();
         }
+        if ('hebrevc' === $lc) {
+            return CompilerVersion::advertisesHebrevc();
+        }
         if (\in_array($lc, [
             'array_any',
             'array_all',

diff --git a/ext/standard/Module.php b/ext/standard/Module.php
@@ -250,7 +250,7 @@ public function getFunctions(): array
             new soundex(),
             new metaphone(),
             new hebrev(),
-            new hebrevc(),
+            ...(CompilerVersion::supportsHebrevc() ? [new hebrevc()] : []),
             ...(CompilerVersion::supportsConvertCyrString() ? [new convert_cyr_string()] : []),
             new strnatcmp(),
             new strnatcasecmp(),

diff --git a/lib/CompilerVersion.php b/lib/CompilerVersion.php
@@ -367,21 +367,25 @@ public static function advertisesStrIncrement(): bool
     /**
      * PHP 8.3+ class_uses_recursive() (ext/standard/basic_functions.c, issue #6469, #12816, #16708).
      *
-     * Enabled by default on the 8.4.0-dev toolchain (runtime reports 8.4; php-src has the builtin since 8.3).
-     * `PHP_COMPILER_PROFILE=8.2` (or older) keeps the Zend 8.2 reference gate (function absent).
+     * Withheld on 8.4.0-dev reference profile (matches Zend 8.2 function_exists gate). Enable via
+     * stable 8.4.0+ or explicit `PHP_COMPILER_PROFILE=8.3` / `8.4` forward profile.
      */
     public static function supportsClassUsesRecursive(): bool
     {
         if (version_compare(self::VERSION, '8.3', '<')) {
             return false;
         }
 
+        if (version_compare(self::VERSION, '8.4.0', '>=')) {
+            return true;
+        }
+
         $raw = getenv('PHP_COMPILER_PROFILE');
-        if (\is_string($raw) && '' !== trim($raw)) {
-            return version_compare(self::languageProfileVersion(), '8.3.0', '>=');
+        if (!\is_string($raw) || '' === trim($raw)) {
+            return false;
         }
 
-        return self::advertisesBuiltinSince('8.3.0');
+        return version_compare(self::languageProfileVersion(), '8.3.0', '>=');
     }
 
     /**
@@ -961,27 +965,40 @@ public static function supportsClassHasFunctions(): bool
      * PHP 8.4+ attribute_exists(), class_meth_exists(), unitenum_exists()
      * (ext/reflection/php_reflection.c, ext/standard/basic_functions.c; #14995, #15692, #17138).
      *
-     * Default 8.4.0-dev toolchain registers the builtins; withheld when
-     * {@see languageProfileVersion()} is below 8.4.0 (e.g. `PHP_COMPILER_PROFILE=8.2`).
+     * Withheld on 8.4.0-dev reference profile (matches Zend 8.2 function_exists gate). Enable via
+     * stable 8.4.0+ or explicit `PHP_COMPILER_PROFILE=8.4` forward profile.
      */
     public static function supportsPhp84ReflectionProbeBuiltins(): bool
     {
         if (version_compare(self::VERSION, '8.4', '<')) {
             return false;
         }
 
+        if (version_compare(self::VERSION, '8.4.0', '>=')) {
+            return true;
+        }
+
         $raw = getenv('PHP_COMPILER_PROFILE');
-        if (\is_string($raw) && '' !== trim($raw)) {
-            return version_compare(self::languageProfileVersion(), '8.4.0', '>=');
+        if (!\is_string($raw) || '' === trim($raw)) {
+            return false;
         }
 
-        return version_compare(self::builtinAdvertisementVersion(), '8.4.0', '>=');
+        return version_compare(self::languageProfileVersion(), '8.4.0', '>=');
     }
 
-    /** attribute_exists()/class_meth_exists()/unitenum_exists() visible to function_exists() — same gate as {@see supportsPhp84ReflectionProbeBuiltins()}. */
+    /** attribute_exists()/class_meth_exists()/unitenum_exists() visible to function_exists() — stable runtime or forward 8.4+ (#17206). */
     public static function advertisesPhp84ReflectionProbeBuiltins(): bool
     {
-        return self::supportsPhp84ReflectionProbeBuiltins();
+        if (version_compare(self::VERSION, '8.4.0', '>=')) {
+            return true;
+        }
+
+        $raw = getenv('PHP_COMPILER_PROFILE');
+        if (!\is_string($raw) || '' === trim($raw)) {
+            return false;
+        }
+
+        return version_compare(self::languageProfileVersion(), '8.4.0', '>=');
     }
 
     /**
@@ -1593,29 +1610,42 @@ public static function supportsArrayPadPadType(): bool
     /**
      * PHP 8.4+ mb_trim/ltrim/rtrim (ext/mbstring/mbstring.c, issue #11901, #12797, #9977, #17120).
      *
-     * Default 8.4.0-dev toolchain registers the builtins; withheld when
-     * {@see languageProfileVersion()} is below 8.4.0 (e.g. `PHP_COMPILER_PROFILE=8.2`).
+     * Withheld on 8.4.0-dev reference profile (matches Zend 8.2 function_exists gate). Enable via
+     * stable 8.4.0+ or explicit `PHP_COMPILER_PROFILE=8.4` forward profile.
      */
     public static function supportsMbTrimFunctions(): bool
     {
         if (version_compare(self::VERSION, '8.4', '<')) {
             return false;
         }
 
+        if (version_compare(self::VERSION, '8.4.0', '>=')) {
+            return true;
+        }
+
         $raw = getenv('PHP_COMPILER_PROFILE');
-        if (\is_string($raw) && '' !== trim($raw)) {
-            return version_compare(self::languageProfileVersion(), '8.4.0', '>=');
+        if (!\is_string($raw) || '' === trim($raw)) {
+            return false;
         }
 
-        return version_compare(self::builtinAdvertisementVersion(), '8.4.0', '>=');
+        return version_compare(self::languageProfileVersion(), '8.4.0', '>=');
     }
 
     /**
-     * mb_trim/ltrim/rtrim visible to function_exists() — same gate as {@see supportsMbTrimFunctions()}.
+     * mb_trim/ltrim/rtrim visible to function_exists() — stable runtime or forward 8.4+ (#17206).
      */
     public static function advertisesMbTrimFunctions(): bool
     {
-        return self::supportsMbTrimFunctions();
+        if (version_compare(self::VERSION, '8.4.0', '>=')) {
+            return true;
+        }
+
+        $raw = getenv('PHP_COMPILER_PROFILE');
+        if (!\is_string($raw) || '' === trim($raw)) {
+            return false;
+        }
+
+        return version_compare(self::languageProfileVersion(), '8.4.0', '>=');
     }
 
     /**
@@ -1707,29 +1737,81 @@ public static function supportsDisktotalspace(): bool
     /**
      * PHP 8.3+ crc32c() (ext/standard/crc32.c, issue #3270, #17139).
      *
-     * Enabled by default on the 8.4.0-dev toolchain (runtime reports 8.4; php-src has the builtin since 8.3).
-     * `PHP_COMPILER_PROFILE=8.2` keeps the Zend 8.2 reference gate (function absent).
+     * Withheld on 8.4.0-dev reference profile (matches Zend 8.2 function_exists gate). Enable via
+     * stable 8.4.0+ or explicit `PHP_COMPILER_PROFILE=8.3` / `8.4` forward profile.
      */
     public static function supportsCrc32c(): bool
     {
         if (version_compare(self::VERSION, '8.3', '<')) {
             return false;
         }
 
+        if (version_compare(self::VERSION, '8.4.0', '>=')) {
+            return true;
+        }
+
         $raw = getenv('PHP_COMPILER_PROFILE');
-        if (\is_string($raw) && '' !== trim($raw)) {
-            return version_compare(self::languageProfileVersion(), '8.3.0', '>=');
+        if (!\is_string($raw) || '' === trim($raw)) {
+            return false;
         }
 
-        return self::advertisesBuiltinSince('8.3.0');
+        return version_compare(self::languageProfileVersion(), '8.3.0', '>=');
     }
 
     /**
-     * crc32c() visible to function_exists() — same gate as {@see supportsCrc32c()} (#17139).
+     * crc32c() visible to function_exists() — stable runtime or forward 8.3+ (#17206).
      */
     public static function advertisesCrc32c(): bool
     {
-        return self::supportsCrc32c();
+        if (version_compare(self::VERSION, '8.4.0', '>=')) {
+            return true;
+        }
+
+        $raw = getenv('PHP_COMPILER_PROFILE');
+        if (!\is_string($raw) || '' === trim($raw)) {
+            return false;
+        }
+
+        return version_compare(self::languageProfileVersion(), '8.3.0', '>=');
+    }
+
+    /**
+     * PHP 8.3+ hebrevc() (ext/standard/string.c, issue #17183, #17206).
+     *
+     * Withheld on 8.4.0-dev reference profile (matches Zend 8.2 function_exists gate). Enable via
+     * stable 8.4.0+ or explicit `PHP_COMPILER_PROFILE=8.3` / `8.4` forward profile.
+     */
+    public static function supportsHebrevc(): bool
+    {
+        if (version_compare(self::VERSION, '8.3', '<')) {
+            return false;
+        }
+
+        if (version_compare(self::VERSION, '8.4.0', '>=')) {
+            return true;
+        }
+
+        $raw = getenv('PHP_COMPILER_PROFILE');
+        if (!\is_string($raw) || '' === trim($raw)) {
+            return false;
+        }
+
+        return version_compare(self::languageProfileVersion(), '8.3.0', '>=');
+    }
+
+    /** hebrevc() visible to function_exists() — stable runtime or forward 8.3+ (#17206). */
+    public static function advertisesHebrevc(): bool
+    {
+        if (version_compare(self::VERSION, '8.4.0', '>=')) {
+            return true;
+        }
+
+        $raw = getenv('PHP_COMPILER_PROFILE');
+        if (!\is_string($raw) || '' === trim($raw)) {
+            return false;
+        }
+
+        return version_compare(self::languageProfileVersion(), '8.3.0', '>=');
     }
 
     /**

diff --git a/test/compliance/JITTest.php b/test/compliance/JITTest.php
@@ -151,6 +151,15 @@ public static function providePHPTests(): \Generator
                 && !str_contains($name, 'crc32c_phantom')) {
                 continue;
             }
+            if (!CompilerVersion::supportsHebrevc()
+                && str_contains($name, 'hebrevc')
+                && !str_contains($name, 'hebrevc_phantom')) {
+                continue;
+            }
+            if (CompilerVersion::supportsHebrevc()
+                && str_contains($name, 'hebrevc_phantom')) {
+                continue;
+            }
             if (!CompilerVersion::supportsMbStrPad()
                 && str_contains($name, 'mb_str_pad')
                 && !str_contains($name, 'mb_str_pad_phantom')) {

diff --git a/test/compliance/VMTest.php b/test/compliance/VMTest.php
@@ -146,6 +146,15 @@ public static function providePHPTests(): \Generator
                 && !str_contains($name, 'crc32c_phantom')) {
                 continue;
             }
+            if (!CompilerVersion::supportsHebrevc()
+                && str_contains($name, 'hebrevc')
+                && !str_contains($name, 'hebrevc_phantom')) {
+                continue;
+            }
+            if (CompilerVersion::supportsHebrevc()
+                && str_contains($name, 'hebrevc_phantom')) {
+                continue;
+            }
             if (!CompilerVersion::supportsJsonValidate()
                 && str_contains($name, 'json_validate')
                 && !str_contains($name, 'json_validate_phantom')

diff --git a/test/compliance/cases/stdlib/hebrevc.phpt b/test/compliance/cases/stdlib/hebrevc.phpt
@@ -1,5 +1,7 @@
 --TEST--
 stdlib hebrevc() visual Hebrew with newline conversion (#17183)
+--ENV--
+PHP_COMPILER_PROFILE=8.4
 --FILE--
 <?php
 $shalomOlam = "\xf9\xec\xe5\xed\x20\xf2\xe5\xec\xed";

diff --git a/test/compliance/cases/stdlib/hebrevc_jit.phpt b/test/compliance/cases/stdlib/hebrevc_jit.phpt
@@ -1,5 +1,7 @@
 --TEST--
 stdlib hebrevc() JIT (#17183)
+--ENV--
+PHP_COMPILER_PROFILE=8.4
 --JIT--
 --FILE--
 <?php

diff --git a/test/compliance/cases/stdlib/hebrevc_phantom.phpt b/test/compliance/cases/stdlib/hebrevc_phantom.phpt
@@ -0,0 +1,9 @@
+--TEST--
+stdlib hebrevc() — not advertised on PHP 8.2 reference profile (#17206, ext/standard/string.c)
+--ENV--
+PHP_COMPILER_PROFILE=8.2
+--FILE--
+<?php
+echo function_exists('hebrevc') ? "fail\n" : "ok\n";
+--EXPECT--
+ok
diff --git a/test/compliance/cases/stdlib/profile_gate/forward_profile_builtin_leak_82.phpt b/test/compliance/cases/stdlib/profile_gate/forward_profile_builtin_leak_82.phpt
@@ -0,0 +1,11 @@
+--TEST--
+stdlib forward-profile builtins — withheld on 8.2 reference profile (#17206)
+--FILE--
+<?php
+$leaked = array_filter(
+    ['mb_trim', 'crc32c', 'hebrevc', 'attribute_exists', 'class_uses_recursive'],
+    static fn (string $fn): bool => function_exists($fn)
+);
+echo [] === $leaked ? "ok\n" : 'fail: '.implode(',', $leaked)."\n";
+--EXPECT--
+ok
diff --git a/test/repro/maintainer_gap_crc32c_builtin.php b/test/repro/maintainer_gap_crc32c_builtin.php
@@ -3,7 +3,9 @@
 declare(strict_types=1);
 
 /**
- * Maintainer repro: crc32c() enabled on default dev profile (#17139, ext/standard/crc32.c).
+ * Maintainer repro: crc32c() on forward profile (#17139, ext/standard/crc32.c).
+ *
+ * Run with: PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/repro/maintainer_gap_crc32c_builtin.php
  */
 
 if (!function_exists('crc32c')) {

diff --git a/test/repro/maintainer_gap_forward_profile_builtin_leak_82.php b/test/repro/maintainer_gap_forward_profile_builtin_leak_82.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * Maintainer repro: forward-profile builtins must not leak on 8.2 reference profile (#17206).
+ *
+ * Default harness (unset PHP_COMPILER_PROFILE) matches Zend 8.2 function_exists gates.
+ */
+
+$leaked = [];
+foreach ([
+    'mb_trim',
+    'crc32c',
+    'hebrevc',
+    'attribute_exists',
+    'class_uses_recursive',
+] as $fn) {
+    if (function_exists($fn)) {
+        $leaked[] = $fn;
+    }
+}
+
+if ([] !== $leaked) {
+    fwrite(STDERR, 'fail: leaked on reference profile: '.implode(', ', $leaked)."\n");
+    exit(1);
+}
+
+echo "ok\n";
diff --git a/test/repro/maintainer_gap_hebrevc_missing.php b/test/repro/maintainer_gap_hebrevc_missing.php
@@ -4,6 +4,8 @@
 
 /**
  * Maintainer repro: hebrevc() registration and newline conversion (#17183).
+ *
+ * Run with: PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/repro/maintainer_gap_hebrevc_missing.php
  */
 
 if (!function_exists('hebrevc')) {
-Original file line number
+Diff line change
@@ Expand Up / @@ -4,6 +4,8 @@ @@
     /**
      * Maintainer repro: hebrevc() registration and newline conversion (#17183).
+     *
+     * Run with: PHP_COMPILER_PROFILE=8.4 php bin/vm.php test/repro/maintainer_gap_hebrevc_missing.php
      */
     if (!function_exists('hebrevc')) {
@@ Expand Down @@