shortcode to create dynamic dropdown box form shortcode attributes

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Based on your example at the bottom of your question, and your statement that you would like something like that for readability, I’d do something like this:

function dropdown_option($atts) {
  $dropid = (isset($atts['dropid'])) ? $atts['dropid'] : '';
  global $sco_array;
  if (!empty($atts['value']) && !empty($atts['text'])) {
    $sco_array[$dropid][$atts['value']] = $atts['text'];
  }
}
add_shortcode('sco','dropdown_option');

function sc_dropdown($atts) {
  $id = (isset($atts['id'])) ? $atts['id'] : 'sc_dropdown';
  $dropid = (isset($atts['dropid'])) ? $atts['dropid'] : '';
  global $sco_array;
  $sel="";
  if (!empty($sco_array[$dropid])) {
    $sel .= '<select id="'.$id.'" >';
      $sel .= '<option value="option0">Please select a module to download</option>';
      foreach($sco_array[$dropid] as $k=>$v) {
        $sel .= '<option value="'.$k.'">'.$v.'</option>';
      }
    $sel .= '</select>';
  }
  return $sel;
}
add_shortcode('scd','sc_dropdown');

Then you can build and display your dropdown with two shortcodes:

[sco dropid="one" value="http://example.com" text="Option1"]
[sco dropid="one" value="http://example1.com" text="Option2"]
[sco dropid="one" value="http://example2.com" text="Option3"]
[scd dropid="one" id="wlmm-select-dropdown"]

The first shortcode builds your options one at a time– three shown. The second one displays it. The dropid value should let you put multiple selects on the same page, if you wanted to.

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