Try the following...
<?php
if (isset($_POST["user_id"]))
echo "<br><input type='text' name='user_id' size='40' maxlength='15' value='".$_POST["user_id"]."'>";
else
echo "<br><input type='text' name='user_id' size='40' maxlength='15'>";
?>
... you just need to come out of the string and back into PHP code. You can do it within the string but I prefer to separate my PHP from strings so that I know where the logic is.
Tryst
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