Can I extract a tar as special user?

My special username is:
user123

My special password is:
password123

This is how I extract files from a tar:
tar xf tar.tar

When I am logged in as "foo" how can I extract the files from a tar as user123 so they are owned by user123?

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hankknightAsked:
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zerodollarsCommented:
use the 'su' command.

type 'man su' to get the help manual up and it will give you all the available info on it.
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michofreihaCommented:
use sudo su and extract the file
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hankknightAuthor Commented:
Could you please be more specific?

I am doing this from PHP so I have only one line to do it in:

<?php  shell_exec('tar xf tar.tar'); ?>
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hankknightAuthor Commented:
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