php - how to preserve data in <select> element -

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for multiple steps form preserve entered value in <input> elements code: 

<input name="city" type="text" value="<?php echo isset($_post['city']) ? $_post['city'] : '' ?>"/>

but don't know how implement <select> elements in order preserve selected option.

add "selected" desired option:

<select>   <option value="a" <?php echo ($_post['select'] == 'a') ? 'selected' : ''; ?>>a</option>;   <option value="b" <?php echo ($_post['select'] == 'b') ? 'selected' : '' ?>>b</option>   <option value="c" <?php echo ($_post['select'] == 'c') ? 'selected' : ''; ?>>c</option> </select>

or, if create select loop, once every options:

<?php $list = array('a', 'b', 'c'); ?>  <select> <?php foreach($list $value): ?>    <option value="<?php echo $value; ?>" <?php echo ($_post['select'] == $value) ? 'selected' : ''; ?>><?php echo $value; ?></option> <?php endforeach; ?> </select>

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