After the html drop-down menu is submitted, the selected value is retained without returning to the default value_HTML/Xhtml_Web page production

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The code is as follows:

// Get the select value
$select_value = isset($_GET['select']) ? $_GET['select'] : '';
?>

default
// If the value obtained above is the same as the value in this option,
// print selected and let this option be selected by default
echo $select_value == 'option1 ' ? 'selected' : ''
?>>option1

This script must be added to each option. If there are multiple options, they can be printed in a loop.