<form action="" method="post">
    Description: <br />
    <textarea name="description" rows="10" cols="40">
    </textarea>

    <br />

    Error: <br />
    <textarea name="error" rows="10" cols="40">
    </textarea>
    <br />

    Code: <br />
    <textarea name="code" rows="10" cols="40">
    </textarea>
    <input type="submit" value="Create thread" />
</form>
<?php
    &description = &_POST["description"];
    &error = &_POST["error"];
    &code = &_POST["code"];
    &text = &description . "\n[code]" . &error . "[/code]\n[code=java]" . &code . "[/code]";
?>