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    <p>As long as you sanitize data appropriately for your queries then you don't <strong>have</strong> to use PDO/prepared statements. <em>Though</em>, I would personally recommend using PDO/prepared statements simply because they do both make development/debugging easier and prepared statements prevent incorrect data types from even getting in to a query.</p> <p>If you want to learn more about how to create a simple prepared statement look in to the function <code>sprintf</code>. You simply replace any variable strings, integers, etc with a type specifier (in this case <code>%s</code> and <code>%d</code> respectively).</p> <p>So for example in the following query, I know that <code>id</code> is going to be an integer (it will be numerical) and <code>name</code> will be a string (alphanumeric).</p> <pre><code>$username = 'Simon'; $id = 3; $query = "SELECT FROM `users` WHERE `id` = {$id} AND `name` = '{$username}'"; </code></pre> <p>If I'm getting either of this variables from an un-trusted source (such as a POST/GET) then I can make sure they are the correct data types by replacing the final line (the $query set) with a <code>sprintf</code> call like this:</p> <pre><code>$username = 'Simon'; $id = 3; $query = sprintf( "SELECT FROM `users` WHERE `id` = %d AND `name` = '%s'", $id, $username ); </code></pre> <p><code>sprintf</code> will simply not let me use a string for the $id or an integer for the $name when it is called which ensures the correct types of data are given (this gives me that little extra bit of security). IF incorrect data types ARE given then <em>I believe</em> it'll cast the variables to the requested type.</p> <p>To read more about <code>sprintf</code> visit here: <a href="http://php.net/sprintf" rel="nofollow noreferrer">http://php.net/sprintf</a></p> <p>I hope this explains enough (it's my first answer) :).</p>
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    1. POShould I really be using PDO and prepared statements?
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    1. COI have seen the sprintf() used before in things like wordpress, vbulletin, and other well known code. In your example, $query would then be ran in a regular mysql function? I realize sprintf() is more secure but I am curious, is this considered a real "prepared statement" or just a similar technique? Thanks
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      1. USJasonDavis
    2. COIt won't, however, sanitise your SQL for you. That code won't work. You'll end up with `... AND \`name\` = Simon`—you didn't add the quotes around "Simon", and `sprintf` definitely won't do that for you.
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      1. USSamir Talwar
    3. COYes, you'd then run this through your relevant MySQL query function (mysql_query() if you're using the standard driver). I'm not sure if you would consider sprintf as a real prepared statement but it's close enough at least :-) @Samir: Apologies, I removed the ' by a mistake. Thanks for pointing it out! +1
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