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    <p>Your question is a bit confusing. Inserting data "by validating it" doesn't make sense.</p> <p>If you want to know how to insert data, well that's a basic MySQL question which is probably best answered by consulting the <a href="http://dev.mysql.com/doc/refman/5.1/en/insert.html" rel="nofollow noreferrer">online documentation</a>.</p> <p>If you want to know how to validate the data, you're going to have to specify the kind of validation you want--as sanders has answered. It's sort of like asking "how do I make a GUI?" There are infinite ways you can do it. The question is too vague.</p> <p>If you just want to check to see if the value submitted is a valid date, a quick and dirty (lazy) way of doing it is just to insert it into the table (assuming you have a column of the <a href="http://dev.mysql.com/doc/refman/5.0/en/datetime.html" rel="nofollow noreferrer">DATE/DATETIME type</a>), then make a follow-up query to retrieve the value stored. If the stored value is that data type's "zero" value (i.e. '0000-00-00' or '0000-00-00 00:00:00'), then the submitted value was not a valid date.</p> <p>So your code would look something like:</p> <pre><code>&lt;? $month = mysql_real_escape_string($_POST['month']); $day = mysql_real_escape_string($_POST['day']); $year = mysql_real_escape_string($_POST['year']); $query = "INSERT INTO my_table (`birthday`) VALUES ('$year-$month-$day')"; mysql_query($query); $query = "SELECT `birthday` FROM my_table WHERE `id`=LAST_INSERT_ID()"; $qid = mysql_query($query); $res = mysql_fetch_object($query); if ($res-&gt;birthday == '0000-00-00') { // submitted date was invalid } ?&gt; </code></pre> <p>Of course, there are many drawbacks to the above code. Ideally, you probably want to validate the data <i>before</i> you insert it, and if you are updating a record rather than inserting a new one, then you will need to fetch the original value before it is overwritten with an invalid one.</p> <p>BTW: I think you meant to say "drop-down list" or "select list." A drop-down menu is something else.</p>
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    1. POHow to validate drop down menus in php?
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