Databases
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PO
 

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    <p>First point: If you're getting an error from <code>mysql_real_escape_string()</code>, it's because you are calling the function before you're connected to the database.</p> <p>It looks like you connect to the database right before you run a query. So anything you do before you call your <code>mm_mysqlquery()</code> function won't have a connection.</p> <p>The <code>mysql_real_escape_string()</code> function needs a live connection to the database, so it can do the right kind of escaping with respect to the connection's character set. So you need to connect <em>before</em> you do escaping.</p> <p>It's better to do that anyway, because if you make several queries during the course of a single PHP request, it's less overhead to connect <em>once</em> and use the same connection for all your queries.</p> <p>Second, please don't take suggestions to use <code>addslashes()</code> -- it does not do the same thing as <code>mysql_real_escape_string()</code>. The two are not interchangeable. You should get into the habit of using <code>mysql_real_escape_string()</code>.</p> <p>Third, your <code>sani()</code> function shows a common misconception.</p> <pre><code>function sani($string){ $string = strip_tags($string); $string = htmlspecialchars($string); $string = trim(rtrim(ltrim($string))); $string = mysql_real_escape_string($string); return $string; } </code></pre> <p>The common misconception is that you need all these functions to make a string safe in an SQL statement. You don't. Only <code>mysql_real_escape_string()</code> is necessary. All the other functions in this example do nothing to protect against SQL injection.</p> <p>Those functions are useful if you output a string in an HTML presentation and you want to reduce the risk of XSS attacks, but then <code>mysql_real_escape_string()</code> is irrelevant.</p> <p>Use each type of sanitizing method in its appropriate context.</p>
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    1. POCan't use mysql_real_escape_string
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    1. USBill Karwin
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      1. VTUpMod
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    3. VO
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    1. CO+1 it's all about context
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      1. USalex
 

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