Content page customization in Drupal

If you want to customize Content page (admin/content/node) in Drupal (on screen below) you can insert form altering hook:

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1. /** 
2.  * Implementation of hook_form_alter(). 
3.  */  
4. function custom_form_alter(&$form, $form_state, $form_id) {   
5.  if($form_id == 'node_admin_content') { // form overview name   
6.   // available fields:  
7.   // $form['admin']['title'][nid]  
8.   // $form['admin']['name'][nid]  
9.   // $form['admin']['username'][nid]  
10.   // $form['admin']['status'][nid]  
11.   // $form['admin']['language'][nid]  
12.   
13.   // or in simplest way  
14.   echo "<pre>";  
15.   print_r($form['admin']);  
16.   echo "</pre>";  
17.  }  
18. }  

/**
 * Implementation of hook_form_alter().
 */
function custom_form_alter(&$form, $form_state, $form_id) { 
 if($form_id == 'node_admin_content') { // form overview name 
  // available fields:
  // $form['admin']['title'][nid]
  // $form['admin']['name'][nid]
  // $form['admin']['username'][nid]
  // $form['admin']['status'][nid]
  // $form['admin']['language'][nid]

  // or in simplest way
  echo "
";
  print_r($form['admin']);
  echo "
";
 }
}