Trouble deleting cookies

[php]<?php

$expire = time()-3600;

setcookie(‘user_id’, ‘’, $expire);
setcookie(‘user_email’, ‘’, $expire);
setcookie(‘user_name’, ‘’, $expire);

print_r($_COOKIE);

//header(‘Location: http://alexcoady.co.uk/coadate/’);

?>[/php]

I’m desperately trying to delete these cookies as part of a sign in and out script. I’ve commented out the header section, and the print_r function shows all 3 cookies as their original values. I’m sure the syntax is correct, can anybody help?

Thanks in advance.

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