PHP Autocomplete has combo box built-in. Combo box is a combination of drop-down list and text box. Users can either type a value directly into the text box or choose from a list of existing options.
Combo box feature is not enabled by default. To enable combobox, call enable_combobox() and set parameter to true. Note that the $data definition has the same definition as the previous examples.
$pac_cb = new C_PhpAutocomplete('combobox', $data);
<input id="combobox" type="hidden" />
Try it yourself (type something that is NOT in the selection, then press Enter):