fix: return an empty string when readline() reaches end-of-file

system/CLI/InputOutput.php

@@ -46,14 +46,14 @@ public function input(?string $prefix = null): string
             // @codeCoverageIgnoreStart
             $prompt = $this->readlinePrompt($prefix, readline_info('library_version'));
 
-            if ($prompt !== null) {
-                return readline($prompt);
+            if ($prompt === null) {
+                // The library cannot render the prompt, so write it ourselves and let readline() only read the line.
+                self::fwrite(STDOUT, $prefix ?? '');
             }
 
-            // The library cannot render the prompt, so write it ourselves and let readline() only read the line.
-            self::fwrite(STDOUT, $prefix ?? '');
+            $input = readline($prompt);
 
-            return readline();
+            return $input === false ? '' : $input;
             // @codeCoverageIgnoreEnd
         }
 

user_guide_src/source/changelogs/v4.7.5.rst

@@ -39,6 +39,7 @@ Bugs Fixed
 - **CLI:** Fixed a bug where pressing backspace in a ``CLI::prompt()`` erased the prompt text when the ``readline`` extension is enabled. The prompt is now passed to ``readline()`` so line redraws repaint it.
   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``.
 - **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).
 - **Content Security Policy:** Fixed a bug where empty ``Content-Security-Policy``, ``Content-Security-Policy-Report-Only``, and ``Reporting-Endpoints`` response headers were generated when no corresponding values existed.