What are common pitfalls to avoid when trying to output database query results in <input> fields using PHP?

One common pitfall to avoid when outputting database query results in <input> fields using PHP is not properly escaping the data to prevent SQL injection attacks. To solve this issue, use prepared statements with parameterized queries to securely retrieve and display the data in the input fields. 

&lt;?php
// Establish a database connection
$servername = &quot;localhost&quot;;
$username = &quot;username&quot;;
$password = &quot;password&quot;;
$dbname = &quot;database&quot;;

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn-&gt;connect_error) {
    die(&quot;Connection failed: &quot; . $conn-&gt;connect_error);
}

// Prepare and execute a parameterized query
$stmt = $conn-&gt;prepare(&quot;SELECT id, name FROM users WHERE id = ?&quot;);
$stmt-&gt;bind_param(&quot;i&quot;, $id);

$id = 1; // Example ID
$stmt-&gt;execute();
$stmt-&gt;bind_result($id, $name);

// Output the query results in &lt;input&gt; fields
while ($stmt-&gt;fetch()) {
    echo &quot;&lt;input type=&#039;text&#039; name=&#039;id&#039; value=&#039;&quot; . htmlspecialchars($id) . &quot;&#039;&gt;&quot;;
    echo &quot;&lt;input type=&#039;text&#039; name=&#039;name&#039; value=&#039;&quot; . htmlspecialchars($name) . &quot;&#039;&gt;&quot;;
}

$stmt-&gt;close();
$conn-&gt;close();
?&gt;

Keywords

SQL injection htmlentities prepared statements XSS data validation

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