[php-src] Issue #11383: Fwrite to stdout in childprocess not shown

Issue: https://github.com/php/php-src/issues/11383 Author: remco-pc ### Description it won't write text there so you don't know there is a prompt. (fwrite(STDOUT, $text) also i get a timeout (execute timeout) in my own framework which holds some more code. and if i write something to stdin it wont get accepted / continue executing script. test1.php ``` <?php $command = escapeshellcmd(PHP_BINARY) . ' ' . escapeshellarg(__DIR__ . '/test2.php'); var_dump(exec($command, $output)); var_dump($output); ``` test2.php ``` <?php function my_readline($text='') { fwrite(STDOUT, $text); return trim(fgets(STDIN)); } $a = my_readline('test: '); echo $a; ``` the fwrite to STDOUT isn't executed if i run test1.php ### PHP Version 8.2 ### Operating System Debian 11.6