Identify form control id in Drupal 7 Forms API

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Does form controls in Forms API have id's? Below is my sample code:

function myid_user_page_form(){  
    $form = array();
    $form['id'] = array(
        '#type' => 'fieldset',
        '#title' => t('ID Information'),
        '#collapsible' => TRUE, 
        '#collapsed' => FALSE,
    );  
    $form['id']['myphoto_button'] = array(
        '#type' => 'button', 
        '#value' => '...',
        '#attributes' => array(
        'onclick' => "myphoto_options();",),  
    );
    return $form;
 }

Sorry for this very simple beginner's question but how to identify my button's id in the sample above(e.g) $form['id']['myphoto_button']?

asked 58 secs ago

Alyssa Gono

190

Identify form control id in Drupal 7 Forms API