How can one preselect a value in a dynamic select form field based on a previous query result in PHP?

To preselect a value in a dynamic select form field based on a previous query result in PHP, you can first fetch the query result and store the selected value in a variable. Then, when generating the select options in the form, you can use a conditional statement to check if the option value matches the selected value, and add the 'selected' attribute to that option accordingly. 

// Assuming $selectedValue contains the value to be preselected

echo '<select name="dynamic_select">';
foreach ($options as $option) {
    if ($option['value'] == $selectedValue) {
        echo '<option value="' . $option['value'] . '" selected>' . $option['label'] . '</option>';
    } else {
        echo '<option value="' . $option['value'] . '">' . $option['label'] . '</option>';
    }
}
echo '</select>';

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