diff --git a/.gitignore b/.gitignore
index 91120a5fa6b2..55c441323cf1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -237,6 +237,7 @@ php
 **/tests/**/*.exp
 **/tests/**/*.log
 **/tests/**/*.sh
+**/tests/**/*.stdin
 
 # Generated by some test cases
 **/tests/**/*.db
diff --git a/run-tests.php b/run-tests.php
index 0db6937c7a84..a90681c7ff7f 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -1934,6 +1934,7 @@ function run_test(string $php, $file, array $env): string
     $diff_filename = $temp_dir . DIRECTORY_SEPARATOR . $main_file_name . 'diff';
     $log_filename = $temp_dir . DIRECTORY_SEPARATOR . $main_file_name . 'log';
     $exp_filename = $temp_dir . DIRECTORY_SEPARATOR . $main_file_name . 'exp';
+    $stdin_filename = $temp_dir . DIRECTORY_SEPARATOR . $main_file_name . 'stdin';
     $output_filename = $temp_dir . DIRECTORY_SEPARATOR . $main_file_name . 'out';
     $memcheck_filename = $temp_dir . DIRECTORY_SEPARATOR . $main_file_name . 'mem';
     $sh_filename = $temp_dir . DIRECTORY_SEPARATOR . $main_file_name . 'sh';
@@ -1972,6 +1973,7 @@ function run_test(string $php, $file, array $env): string
     @unlink($diff_filename);
     @unlink($log_filename);
     @unlink($exp_filename);
+    @unlink($stdin_filename);
     @unlink($output_filename);
     @unlink($memcheck_filename);
     @unlink($sh_filename);
@@ -2696,6 +2698,16 @@ function run_test(string $php, $file, array $env): string
             $diff = generate_diff($wanted, $wanted_re, $output);
         }
 
+        // write .stdin
+        if ($test->hasSection('STDIN') || $test->hasSection('PHPDBG')) {
+            $stdin = $test->hasSection('STDIN')
+                ? $test->getSection('STDIN')
+                : $test->getSection('PHPDBG') . "\n";
+            if (file_put_contents($stdin_filename, $stdin) === false) {
+                error("Cannot create test stdin - $stdin_filename");
+            }
+        }
+
         if (is_array($IN_REDIRECT)) {
             $orig_shortname = str_replace(TEST_PHP_SRCDIR . '/', '', $file);
             $diff = "# original source file: $orig_shortname\n" . $diff;