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POPHP SQL-INJECTION PROTECTION
 

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    <blockquote> <p><strong>Possible Duplicate:</strong><br> <a href="https://stackoverflow.com/questions/60174/best-way-to-stop-sql-injection-in-php">Best way to stop SQL Injection in PHP</a> </p> </blockquote> <p>I just got this PHP script to post my form fields to a SQL table, and it's working fine. Since I plan on using this site with many users, I do not want to allow SQL-Injection's to ruin everything. I am a huge noob to PHP and I was hoping someone here could help me SQL-Inject proof my code.</p> <pre><code> &lt;?php //Check for mysql connection if (!mysql_connect("mysql4.000webhost.com","a3516066_form","lasvegas1")) die('Could not connect: ' . mysql_error()); //Escape SQL characters to protect against SQL injection $username = mysql_real_escape_string($_POST['username']); $hostname = mysql_real_escape_string($_POST['hostname']); $ip = mysql_real_escape_string($_POST['ip']); $email = mysql_real_escape_string($_POST['email']); mysql_select_db("a3516066_form"); //Query to check for username match $userCheck = "SELECT * FROM `Accounts` WHERE username = '$username'"; if(mysql_num_rows(mysql_query($userCheck)) != 0) die("Sorry, username is already in use. Please go back and try again."); //If the username isn't found, insert the values $sql = "INSERT INTO Accounts VALUES ('$username','$hostname','$ip','$email')"; if (mysql_query($sql)) { //Successful query header ("location: /done.html"); exit(); } else //Failed query die("Something is wrong, we could not complete your request."); ?&gt; </code></pre>
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