WordPress Plugin Development – get_option error

I am trying to put the option on selected with the built in function of wordpress called selected. I have tried to change the key from opt to different key names for every select field and it still didn’t work.

At the moment i am stuck, see my code below:

$  taxonomy_args = array(     'public'    =>  true,     '_builtin'  =>  false );  $  taxonomy_names = get_taxonomies($  taxonomy_args);  $  select_field = get_option('select_field');   echo "<form id='example_details' method='post' action''>";     foreach( $  taxonomy_names as $  taxonomy_name ) {         echo "<div class='div_fields'>";         $  taxonomy_name_lc = strtolower($  taxonomy_name);         echo "<label for='$  {taxonomy_name_lc}_select_field'>$  {taxonomy_name}</label>";             echo "<select class='example_form_select' name='details_select_field[opt]' id='$  {taxonomy_name_lc}_select_field'>";                 echo "<option></option>";                 $  terms = get_terms( array(                      'hide_empty'    => false,                     'taxonomy'      => $  taxonomy_name                 ) );                                  foreach ($  terms as $  term) {                     echo "<option id='" . $  term->name . "' value='" . $  term->name . "' " . selected(isset($  select_field['opt']), $  term->name) . ">" . $  term->name . "</option>";                 }               echo "</select>";         echo "</div>";     }     wp_nonce_field( $  this->plugin, 'details_nonce' ); echo "</form>";  

I did a var_dump on the $ select_field variable but that one returns a boolean of false.