php stdin problem

[matej]

I have quite old server (mandriva "perfect setup", ispconfig 2.0, php version 5.2.5) and I have problem with php (reading from stdin). If I put simple script

<?php
 echo "Are you sure you want to do this?  Type 'yes' to continue: ";
 $handle = fopen ("php://stdin","r");
 $line = fgets($handle);
 if(trim($line) != 'yes'){
         echo "ABORTING!\n";
         exit;
 }
 echo "\n";
 echo "Thank you, continuing...\n";
 ?>

and execute it through console, I get error:
PHP Warning: fopen(php://stdin): failed to open stream: No such file or directory

I have same php.ini on "similar" server where this works without problem.

Thanks for any idea/hint.

Matej