tty with shell_exec?

Is it possible to do shell_exec in PHP, which requires a tty?

<?php
   $output = shell_exec("read foo; echo $foo");
?>

If not开发者_开发技巧, what are the alternatives?

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What about:

<?php

echo shell_exec('read foo; export foo; echo $foo');

Note: The var foo will not be available in your shell after the script exit.