Is mysql_real_escape_string() Still Necessary with Prepared Statements?

Escaping Strings in Prepared Statements: The Necessity of mysql_real_escape_string()

When working with SQL queries, it's crucial to safeguard against SQL injection attacks by escaping user-provided input. The question arises: is the mysql_real_escape_string() function still necessary when utilizing prepared statements?

In a given query:

<code class="php">$consulta = $_REQUEST["term"]."%";
$sql = $db->prepare('select location from location_job where location like ?');
$sql->bind_param('s', $consulta);
$sql->execute();
$sql->bind_result($location);

$data = array();

while ($sql->fetch()) {
    $data[] = array('label' => $location);
}</code>

Prepared statements enhance SQL security by separating data from the query, preventing malicious injections. However, it doesn't make mysql_real_escape_string() obsolete.

To ensure data input isn't altering the query, a simple modification in your code can further secure it:

<code class="php">$sql->execute([$consulta]);</code>

This change passes parameters directly through the execute method, utilizing the '?' placeholder. However, remember to process user input through htmlspecialchars() before outputting to defend against HTML injection attacks.

By adhering to proper prepared statement usage, you eliminate the need for mysql_real_escape_string() and enhance the security of your SQL queries.

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