What common mistake was identified in the PHP code provided in the forum thread regarding Select fields?

The common mistake identified in the PHP code provided in the forum thread regarding Select fields is that the value attribute of the <option> tag is not being properly set to match the selected value from the database. To solve this issue, we need to compare the value of each option with the value retrieved from the database and add the 'selected' attribute to the option that matches. 

&lt;select name=&quot;category&quot;&gt;
    &lt;option value=&quot;&quot;&gt;Select Category&lt;/option&gt;
    &lt;?php
    $categories = array(&quot;Category 1&quot;, &quot;Category 2&quot;, &quot;Category 3&quot;);
    foreach($categories as $category) {
        $selected = ($category == $row[&#039;category&#039;]) ? &#039;selected&#039; : &#039;&#039;;
        echo &quot;&lt;option value=&#039;$category&#039; $selected&gt;$category&lt;/option&gt;&quot;;
    }
    ?&gt;
&lt;/select&gt;

Keywords

SQL injection XSS vulnerability select field form validation prepared statements

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