PHP和Drupal：在Drupal中使用php时，如何隐藏/显示我的链接？

Question

Perhaps it is easier if I ask the question this way - Using the coding snippet below, how would I write the code to display the "Change" link only when the value in status is "A"?

I think i'm making this harder than it has to be, but the use of both drupal module structure and php are throwing me, since i am just learning module development.

The link showing in the array below appears at the end of each of my rows. I only want it to appear when the status equals "A".

Because this link is within this array, i can't figure out how and where to implement it. I just want an [if statement] like this:

if (drupal_render($form['status'][$key]['status']) == 'A',)
echo l(t('Change'), 'rooms/avail_room/' . $key . '/' . arg(1), array('attributes' => array('class' => 'room-stat-avail'))),
else{
echo "";
}

so when the html table is displayed, the ' Change ' link will only appear in the last column when the value of status is "A"

Can't believe I got the module working, but can't turn this link on/off as i want. See code snippet below:

function team_room_available_form($form) {
    $output = "No space available.";

  if ($form['roomid']) {
    foreach (element_children($form['roomid']) as $key) {
      $rows[] = array(
        'data' => array(
          drupal_render($form[''][$key]),
          drupal_render($form['room_title'][$key]),
          drupal_render($form['username'][$key]),
          drupal_render($form['status'][$key]['status']),
          l(t('Change'), 'rooms/avail_room/' . $key . '/' . arg(1), array('attributes' => array('class' => 'room-stat-avail'))),
        ),
        'class' => $form['status'][$key]['#value'],
      );
    }

Answer 1

You shouldn't really call drupal_render() on every element of your array.

drupal_render is a theming function to be applied on a renderable array. Check the drupal docs on drupal.org ... Render Arrays in Drupal 7

Practically this means that you should apply your logic within your module before creating your renderable array. Practically your renderable array is just a bunch of values that follows Drupal theming structure.

When you create your array, your logic is just typical PHP. With Drupal you should really try the devel module. It will help you to output your results and help you debug your code.