How can PHP be used to reset dropdown values to display all options after a user has made a selection?

When a user makes a selection in a dropdown menu, you can use PHP to reset the dropdown values to display all options by setting the selected attribute to an empty string. This can be achieved by checking if a specific value has been selected and then setting the selected attribute accordingly.

&lt;select name=&quot;dropdown&quot;&gt;
    &lt;option value=&quot;1&quot;&lt;?php if(isset($_POST[&#039;dropdown&#039;]) &amp;&amp; $_POST[&#039;dropdown&#039;] == &#039;1&#039;) { echo &#039; selected&#039;; } ?&gt;&gt;Option 1&lt;/option&gt;
    &lt;option value=&quot;2&quot;&lt;?php if(isset($_POST[&#039;dropdown&#039;]) &amp;&amp; $_POST[&#039;dropdown&#039;] == &#039;2&#039;) { echo &#039; selected&#039;; } ?&gt;&gt;Option 2&lt;/option&gt;
    &lt;option value=&quot;3&quot;&lt;?php if(isset($_POST[&#039;dropdown&#039;]) &amp;&amp; $_POST[&#039;dropdown&#039;] == &#039;3&#039;) { echo &#039; selected&#039;; } ?&gt;&gt;Option 3&lt;/option&gt;
    &lt;option value=&quot;&quot;&lt;?php if(!isset($_POST[&#039;dropdown&#039;])) { echo &#039; selected&#039;; } ?&gt;&gt;All Options&lt;/option&gt;
&lt;/select&gt;

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PHP dropdown reset selection options

How can PHP be used to reset dropdown values to display all options after a user has made a selection?

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