Fwrite to stdout in childprocess not shown

[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

Working in php 7.4

Operating System

Debian 11.6

[nielsdos]

Are you sure this worked in 7.4? I tried versions 7.3-8.2 and the result is always the same.
It is my understanding of this function that the standard output must be captured by exec, and not displayed to the screen. I could be wrong of course.
If you do want to display the output on screen, use STDERR to print your prompt.

[remco-pc]

So you saying this should work ?

<?php
function my_readline($text='') { 
fwrite(STDERR, $text); 
return trim(fgets(STDIN)); 
} 
$a = my_readline('test: ');
echo $a;

Yes it was working. I made an install script which executes a setup command this way and it did work in the latest php7.4 on Debian 11. So basically exec to a prompt script resulted well in 7.4 and not from 8.0 and up.

The prompt script is in a different composer package so that was the reason

[nielsdos]

Yes with STDERR it works for me because exec only captures STDOUT.

The prompt script is in a different composer package so that was the reason

I'm not sure what you mean by this?

[remco-pc]

Yes with STDERR it works for me because exec only captures STDOUT.

The prompt script is in a different composer package so that was the reason

I'm not sure what you mean by this?

the reason i do it this way. the framework has no idea/knowledge of the package, but if the package has a setup file, it will load it so you can install it. This was working in php 7.4 and not anymore when i updated to 8.2 (also tested in 8.0 & 8.1)

but i will try std_err and will reply here if it works