PHP | Command Prompt | Erase stuff that was echo'd?

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PHP has an 'exec' function which runs commands.. but the problem is that the command for clearing the screen is different on different operating systems.

I came up with this. It's basic but it does the job (kind of) and it will work on any system:

<?php
echo "Before clear screen";
$lines = 5000;
echo str_repeat("\n", $lines);
echo "After clear screen";
?>
 
In my php script, I have a thing where the have to enter there password. (It is on command prompt)
How can I make it so that it makes the password disapear after they hit enter?
 
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