fix: avoid undefined STDERR and STDIN outside the CLI

rector.php

@@ -100,6 +100,7 @@
 
         // Exclude test file because `is_cli()` is mocked and Rector might remove needed parameters.
         RemoveExtraParametersRector::class => [
+            __DIR__ . '/tests/system/CLI/CLITest.php',
             __DIR__ . '/tests/system/Debug/ToolbarTest.php',
         ],
 

system/CLI/CLI.php

@@ -481,7 +481,7 @@ public static function error(string $text, string $foreground = 'light_red', ?st
         // Check color support for STDERR
         $stdout = static::$isColored;
 
-        static::$isColored = static::hasColorSupport(STDERR);
+        static::$isColored = is_cli() && static::hasColorSupport(STDERR);
 
         if ($foreground !== '' || (string) $background !== '') {
             $text = static::color($text, $foreground, $background);
@@ -493,7 +493,7 @@ public static function error(string $text, string $foreground = 'light_red', ?st
             static::$lastWrite = 'write';
         }
 
-        static::fwrite(STDERR, $text . PHP_EOL);
+        static::fwrite(is_cli() ? STDERR : STDOUT, $text . PHP_EOL);
 
         // return STDOUT color support
         static::$isColored = $stdout;
@@ -572,7 +572,7 @@ public static function clearScreen()
     {
         // Unix systems, and Windows with VT100 Terminal support (i.e. Win10)
         // can handle CSI sequences. For lower than Win10 we just shove in 40 new lines.
-        is_windows() && ! static::streamSupports('sapi_windows_vt100_support', STDOUT)
+        is_windows() && is_cli() && ! static::streamSupports('sapi_windows_vt100_support', STDOUT)
             ? static::newLine(40)
             : static::fwrite(STDOUT, "\033[H\033[2J");
     }

system/CLI/SignalTrait.php

@@ -394,7 +394,7 @@ protected function getProcessState(): array
         if ($this->isPosixAvailable()) {
             $state['session_id']               = posix_getsid($pid);
             $state['process_group']            = posix_getpgid($pid);
-            $state['has_controlling_terminal'] = posix_isatty(STDIN);
+            $state['has_controlling_terminal'] = is_cli() && posix_isatty(STDIN);
         }
 
         return $state;

tests/system/CLI/CLITest.php

@@ -563,6 +563,32 @@ public function testError(): void
         $this->assertSame($expected, $this->getStreamFilterBuffer());
     }
 
+    public function testErrorOutsideCliWritesToStdoutWithoutColor(): void
+    {
+        $io = new class () extends InputOutput {
+            /**
+             * @var list<array{string, string}>
+             */
+            public array $writes = [];
+
+            public function fwrite($handle, string $string): void
+            {
+                $this->writes[] = [$handle === STDERR ? 'STDERR' : 'STDOUT', $string];
+            }
+        };
+        CLI::setInputOutput($io);
+
+        is_cli(false);
+
+        try {
+            CLI::error('test');
+        } finally {
+            is_cli(true);
+        }
+
+        $this->assertSame([['STDOUT', "\ntest\n"]], $io->writes);
+    }
+
     public function testMixedWriteError(): void
     {
         CLI::write('test 1');

user_guide_src/source/changelogs/v4.7.5.rst

@@ -46,6 +46,8 @@ Bugs Fixed
   ANSI color codes in the prompt (e.g., option defaults) are wrapped in readline's non-printing markers under GNU readline so cursor positioning stays accurate.
   On Windows, where the ``readline`` extension is built on WinEditLine, the prompt is written to STDOUT first because WinEditLine reports no library version and prints ANSI sequences literally.
 - **CLI:** Fixed a bug where ``CLI::input()`` and ``CLI::prompt()`` threw a ``TypeError`` when STDIN reached end-of-file (e.g., Ctrl+D) with the ``readline`` extension enabled. An empty string is now returned, matching the behavior without ``readline``.
+- **CLI:** Fixed a bug where ``CLI::error()`` threw an ``Error`` for the undefined ``STDERR`` constant when a command ran outside the CLI (e.g., through ``command()`` in a controller). The message is now written like other output.
+  ``CLI::clearScreen()`` on Windows and ``SignalTrait::getProcessState()`` no longer probe the standard streams outside the CLI either.
 - **CLIRequest:** Fixed a bug where ``parseCommand()`` could throw a TypeError when ``argv`` is missing.
 - **CodeIgniter:** Fixed a bug where ``gatherOutput()`` could be called twice when ``startController()`` returned a ``ResponseInterface`` (e.g., from filter attributes or closure routes).
 - **Commands:** Fixed a bug where ``make:migration --session`` silently generated a broken migration when the database group's driver is neither ``MySQLi`` nor ``Postgre``. The command now reports an error and returns ``EXIT_ERROR``.

utils/phpstan-baseline/arguments.count.neon

@@ -1,7 +1,12 @@
-# total 2 errors
+# total 4 errors
 
 parameters:
     ignoreErrors:
+        -
+            message: '#^Function is_cli invoked with 1 parameter, 0 required\.$#'
+            count: 2
+            path: ../../tests/system/CLI/CLITest.php
+
         -
             message: '#^Function is_cli invoked with 1 parameter, 0 required\.$#'
             count: 2

utils/phpstan-baseline/loader.neon

@@ -1,4 +1,4 @@
-# total 12 errors
+# total 14 errors
 
 includes:
     - arguments.count.neon