Multiple Submit Buttons in Same Form

When using multiple submit button in same form one must ensure that the corresponding functions are called for each submit buttons in drupal.

Sample coding for calling specified function is given below.

• Both the buttons are of the same type submit (given in red color)
• but the corresponding function is invoked . (given in green color)
  

function abc_form($form_id, $form_state=NULL) {
// code
$form['submit'] = array(
'#type' => 'submit',
'#value' => t('Submit'),
'#submit'=>array('abc_submit'),
);
$form['update'] = array(
'#type' => 'submit',
'#value' => t('update'),
'#submit'=>array('abc_update'),
);

retun $form;
}

function abc_submit($form_id, $form_state)
{
// this function is called when the submit button is clicked
// code
}


function abc_update($form_id, $form_state)
{
// this function is called when the update button is clicked
// code
}