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PORegistration key generator
 

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    <p>I am trying to create a program that creates random registration keys and stores it in the database.If the user/customer already has a registration code it displays that key stored in the database in a text box on click 'else' it generates a new key and stores it in the database.The problem is i am not being able to store the key in the database.My code is:</p> <pre><code>&lt;?php if (isset($_POST['keygen'])){ $customer_no = $_POST['customer_no']; $result = mysql_query("SELECT * FROM customer WHERE customer_no = '$customer_no'"); $row = mysql_fetch_array($result); $keyString = $row['key']; if($keyString == ""){ $keyString = generateRandomString(); $query = "UPDATE 'customer' SET key ='$keyString' WHERE customer_no = '$customer_no'"; mysql_query($query); echo $keyString; } else{ echo $keyString; } } function generateRandomString($length = 8) { $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; $randomString = ''; for ($i = 0; $i &lt; $length; $i++) { $randomString .= $characters[rand(0, strlen($characters) - 1)]; } return $randomString; } ?&gt; </code></pre> <p>this is my HTML:</p> <pre><code> &lt;div id="content" class="box2"&gt; &lt;div class="login"&gt; &lt;form action="" method="post" style="margin:12px;"&gt; &lt;table class="nostyle"&gt; &lt;tr&gt; &lt;td align="center"&gt; &lt;label style="font-size:16px;"&gt;&lt;strong&gt;Customer ID: &lt;/strong&gt;&lt;/label&gt; &lt;select name="customer_no"&gt; &lt;?php $result_customer= mysql_query('SELECT customer_no FROM customer ORDER BY customer_no'); ?&gt; &lt;?php while($row_customer= mysql_fetch_assoc($result_customer)) { ?&gt; &lt;option &lt;?php if ($row_customer['customer_no']=='') { ?&gt; selected="selected"&lt;?php } ?&gt;&gt; &lt;?php echo htmlspecialchars($row_customer['customer_no']); ?&gt; &lt;/option&gt; &lt;?php } ?&gt; &lt;/select&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td align="center"&gt;&lt;label style="font-size:16px;"&gt;&lt;br /&gt;&lt;strong&gt;Register Key: &lt;/strong&gt;&lt;/label&gt; &lt;input type="text" id="key" class="input-text" name="key" size="20" align="middle" value = " &lt;?=$row["key"];?&gt;"&gt;&lt;/td&gt; &lt;/tr&gt; &lt;td align="center"&gt;&lt;br /&gt;&lt;input type="submit" id="keygen" class="input-submit" name="keygen" value="Generate" onclick=""/&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/form&gt; &lt;/div&gt; &lt;/div&gt; </code></pre> <p>I am a newbie, and am not that sure about the code.Please help!</p>
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    1. CORead about [SQL Injection](http://en.wikipedia.org/wiki/SQL_injection) and [how to prevent it](http://stackoverflow.com/questions/60174/how-can-i-prevent-sql-injection-in-php) before going any further.
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    2. CO[Please, don't use `mysql_*` functions in new code](http://bit.ly/phpmsql). They are no longer maintained [and are officially deprecated](https://wiki.php.net/rfc/mysql_deprecation). See the [red box](http://j.mp/Te9zIL)? Learn about [*prepared statements*](http://j.mp/T9hLWi) instead, and use [PDO](http://php.net/pdo) or [MySQLi](http://php.net/mysqli) - [this article](http://j.mp/QEx8IB) will help you decide which. If you choose PDO, [here is a good tutorial](http://j.mp/PoWehJ). **You are also wide open to [SQL injections](http://stackoverflow.com/q/60174)**
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    3. COShould use backticks round tables, not single quotes
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