Is this PHP code secure?

Posted by Oliver Bayes-Shelton on Stack Overflow See other posts from Stack Overflow or by Oliver Bayes-Shelton
Published on 2010-02-18T14:32:09Z Indexed on 2010/04/03 12:53 UTC
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Just a quick question: is the following PHP code secure? Also is there anything you think I could or should add?

    $post = $_GET['post'];

    if(is_numeric($post))
    {
        $post = mysql_real_escape_string($post);
    }
    else
    {
        die("NAUGHTY NAUGHTY");
    }

    mysql_select_db("****", $*****);

    $content = mysql_query("SELECT * FROM tbl_***** WHERE Id='" . $post . "'");

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