Link: http://www.stevelvalmond.org/2012/07/how-to-select-an-option-in-phptal/

with a defined option array:

<div tal:repeat="row rows">
      <select name="value">
          <option
              tal:repeat="option options"
              value="${option/value}"
              tal:attributes="selected php:option['value'] == row['value']"
          >${option/text}</option>
      </select>
</div>

Related

From Template:


 <span tal:define="global svalue segments/0/unit_operable"/>

          <option value="I" tal:attributes="selected php:svalue == 'I'">
            Inoperable ${svalue}
          </option>

          <option value="O" tal:attributes="selected php:svalue == 'O'">
            Operable
          </option>

          <option value="U" tal:attributes="selected php:svalue == 'U'">
            Unknown
           </option>