Open your /wp-admin/includes/template.php file, and find this code:

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		case 'users':
			$_wp_column_headers[$page] = array(
				'cb' => '<input type="checkbox" />',
				'username' => __('Username'),
				'name' => __('Name'),
				'email' => __('E-mail'),
				'role' => __('Role'),
				'posts' => __('Posts')
			);

then replace with this following code:

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		case 'users':
			$_wp_column_headers[$page] = array(
				'cb' => '<input type="checkbox" />',
				'username' => __('Username'),
				'name' => __('Name'),
				'email' => __('E-mail'),
				'role' => __('Role'),
				'posts' => __('Posts'),
				'user_registered' => __('Registered Date') // added by Masino Sinaga, January 13, 2010
			);

Find again this code:

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			default:
				$r .= "<td $attributes>";
				$r .= apply_filters('manage_users_custom_column', '', $column_name, $user_object->ID);
				$r .= "</td>";
		}

before the first line of that code, please insert this following code:

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			case 'user_registered':  // added by Masino Sinaga, January 13, 2010
				$r .= "<td $attributes>$user_object->user_registered</td>";
				break;

That’s all. Now, go to your wp-admin of your WordPress website, then see the Authors & Users page under the Users menu. You should see now the new column at the right most of the list named Registered Date. I had tested and it worked like a charm.

Please do not hesitate to leave your comment if you have a new idea how to implement this using the plugin in WordPress.

Hopefully this will help someone else out there.

Updated on October 5, 2011: That article above I wrote when the version of WordPress was under 3.0. I found a great plugin today in order to do the same function above. It is Recently Registered.

Suppose we have a table named mytable which has these following records inside:

+----+-------+
| id | name  |
+----+-------+
|  1 | One   |
|  2 | One   |
|  3 | Two   |
|  4 | Two   |
|  5 | Two   |
|  6 | Three |
|  7 | Three |
|  8 | Three |
|  9 | Three |
| 10 | Four  |
| 11 | Five  |
+----+-------+
11 rows in set (0.00 sec)

and you want to display which one has the duplicate content in the name filed become like this:

+-------+---------+
| name  | howmany |
+-------+---------+
| Three |       4 |
| Two   |       3 |
| One   |       2 |
+-------+---------+
3 rows in set (0.00 sec)

In the other words, we will display the value in name field which have more than one records, whereas, the records which do not the duplicate content, will be avoided (in this case the record which have the value in field name-nya: Four and Five).

Well, here is the SQL script to do make it came true:

SELECT name, COUNT(name) AS howmany 
FROM `my_table`
GROUP BY name 
HAVING howmany > 1
ORDER BY howmany DESC;

Open your \include\staff\tickets.inc.php file, and find this code:

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            $qwhere.=" AND ( ticket.email LIKE '%$queryterm%'".
                        " OR ticket.name LIKE '%$queryterm%'".
                        " OR ticket.subject LIKE '%$queryterm%'".
                        " OR message.message LIKE '%$queryterm%'".
                        " OR response.response LIKE '%$queryterm%'".
                        " OR note.note LIKE '%$queryterm%'".
                        " OR note.title LIKE '%$queryterm%'".
                        ' ) ';

then replace with this following code:

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            $qwhere.=" AND ( ticket.email LIKE '%$queryterm%'".
                        " OR ticket.name LIKE '%$queryterm%'".
                        " OR ticket.subject LIKE '%$queryterm%'".
                        " OR message.message LIKE '%$queryterm%'".
                        " OR response.response LIKE '%$queryterm%'".
                        " OR note.note LIKE '%$queryterm%'".
                        " OR note.title LIKE '%$queryterm%'".
                        " OR ticket.applications LIKE '%$queryterm%'". // <-- this is the change
                        ' ) ';

If you add more than one field, then you have to add the other field the same way you do above. Hope it is helpful.

These files are needed to customize if you added new/extra fields in your osTicket:

1. \include\staff\editticket.inc.php
2. \include\class.ticket.php

Basically, the modification you need to apply in the first file above is similar as you did in the \include\client\open.inc.php file for client-side, and in the \include\staff\newticket.inc.php file for staff-side. You also need to customize the update() function as you did also in the create() function that located in the second file above.

We will discuss about it later in the separate article.

1. First of all, alter your ost_ticket table, by adding two new fields: applications and productkey. You may use this following SQL script (please note that ost_ is the table prefix name, in case it differents with yours, adjust it by yourself):

   ALTER TABLE ost_ticket
   ADD COLUMN `applications` varchar(100) default '' NOT NULL,
   ADD COLUMN `productkey` varchar(50) default'' NOT NULL;

2. Open your \include\client\open.inc.php file, and find this code:

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   <? } }?>

   after the last line of that code, please insert this following code:

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   <tr> <td>Applications: </td> <td> <input name=applications[] type=checkbox value="Application 1" >Application 1 <input name=applications[] type=checkbox value="Application 2" >Application 2 <input name=applications[] type=checkbox value="Application 3" >Application 3 <input name=applications[] type=checkbox value="Application 4" >Application 4 <input name=applications[] type=checkbox value="Application 5" >Application 5 </td> </tr> <tr> <td>Product Key: </td> <td> <input type="text" name="productkey" size="35" value="<?=$info['productkey']?>"> </td> </tr>

3. Open your \include\class.ticket.php file, and find this code:

   44	var $overdue;

   after that line, please insert this following code:

   45 46

   var $applications; var $productkey;

   Find again this code:

   88	$this->overdue =$row['isoverdue'];

   then replace with this following code:

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   $this->overdue =$row['isoverdue']; $this->applications =$row['applications']; $this->productkey =$row['productkey'];

   Find again this code:

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   function getSubject() { return $this->subject; }

   after the last line of that code, please insert this following code:

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   function getApplications() { return $this->applications; }   function getProductKey() { return $this->productkey; }

   Find again this code:

   1107	$fields['message'] = array('type'=>'text', 'required'=>1, 'error'=>'Message required');

   after that line, please insert this following code:

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   $fields['applications'] = array('type'=>'text', 'required'=>0, 'error'=>'Applications required'); $fields['productkey'] = array('type'=>'text', 'required'=>0, 'error'=>'Product key required');

   Find again this code:

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   Sys::alertAdmin('Overlimit Notice',$msg); } }

   after the last line of that code, please insert this following code:

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   $mycounter=0; foreach ($var['applications'] as $app) { $strapp .= ($mycounter==0)?$app:", ".$app.""; $mycounter++; } unset($app);

   Find again this code:

   1260	',ip_address='.db_input($ipaddress).

   then replace with this following code:

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   ',ip_address='.db_input($ipaddress). ',applications='.db_input($strapp). ',productkey='.db_input($var['productkey']).

4. Open your \include\client\viewticket.inc.php file, and find this code:

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   <tr> <th>Create Date:</th> <td><?=Format::db_datetime($ticket->getCreateDate())?></td> </tr>

   after the last line of that code, please insert this following code:

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   <tr> <th>Applications:</th> <td><?=$ticket->getApplications()?></td> </tr>

   Find again this code:

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   <tr> <th>Phone:</th> <td><?=Format::phone($ticket->getPhoneNumber())?></td> </tr>

   after that line, please insert this following code:

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   <tr> <th>Product Key:</th> <td><?=$ticket->getProductKey()?></td> </tr>

That’s all. Hopefully this will be helpful.

Open your \include\staff\viewticket.inc.php, and find this code:

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                        <p>
                            <div  style="margin-left: 50px; margin-top: 30px; margin-bottom: 10px;border: 0px;">
                                <input class="button" type='submit' value='Post Reply' />
                                <input class="button" type='reset' value='Reset' />
                                <input class="button" type='button' value='Cancel' onClick="history.go(-1)" />
                            </div>
                        </p>
                    </form>                
                </p>
            </div>

then after the last line of that code, please insert this following code:

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            <div id="youractionhere" class="tabbertab"  align="left">
                <h2>Your New Tab</h2>
                <p>
                This will only demonstrate how you can add your own new tab in viewticket page.
                </p>
	    </div>

It depends on the purpose of that new tab. If you want only to display some information which is read-only, then you simply use the technique that shown on the code above. That’s it, and done until this point! You don’t have to do anything that we will explain on the next paragraph below.

However, if you want this new tab has a form inside, for example, you want to process or send the 2 new field, then we have to created a form and put it inside that new tab. Simply replace this following code that we take from above:

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                <p>
                This will only demonstrate how you can add your own new tab in viewticket page.
                </p>

become:

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                <p>
                    <form action="tickets.php?id=<?=$id?>#youractionhere" name="youractionhere" class="inline" method="post" enctype="multipart/form-data">
                        <input type="hidden" name="ticket_id" value="<?=$id?>">
                        <input type="hidden" name="a" value="youractionhere">
                        <p>
 
                        <div>
                            <label for="field-one">Field One:</label>
                            <input type="text" name="field-one" id="field-one" value="<?=$info['field-one']?>" size=30px />
                            </select><font class="error">*&nbsp;<?=$errors['field-one']?></font>
                        </div>
                        <div style="margin-top: 3px;">
                            <label for="field-two" valign="top">Field Two:</label>
                                <font class="error">*&nbsp;<?=$errors['field-two']?></font></label><br/>
                            <textarea name="field-two" id="field-two" cols="80" rows="7" wrap="soft" style="width:90%"><?=$info['field-two']?></textarea>
                        </div>
 
                            <div  align="left" style="margin-left: 50px;margin-top: 10px; margin-bottom: 10px;border: 0px;">
                                <input class="button" type='submit' value='Submit' />
                                <input class="button" type='reset' value='Reset' />
                                <input class="button" type='button' value='Cancel' onClick="history.go(-1)" />
                            </div>
                        </p>
                    </form>
                </p>

After that, we have to catch that values from the form in the \scp\tickets.php file. Find this code in that file:

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            }else{
                $errors['err']=$errors['err']?$errors['err']:'Unable to post the response.';
            }
            break;

then after the last line of that code above, please insert this following code:

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        case 'youractionhere':
            $fields=array();
            $fields['field-one'] = array('type'=>'text',  'required'=>1, 'error'=>'Field one required');
            $fields['field-two'] = array('type'=>'text',  'required'=>1, 'error'=>'Field two required');
            $params = new Validator($fields);
            if(!$params->validate($_POST)){
                $errors=array_merge($errors,$params->errors());
            }
            // Proceed here, what do you want it to do for those two fields above?
            // Insert it or update the existing value to database? It's up to you, right?
	break;

Generally, only those steps above that you have to do. If you want to add another functionality or your own algorithm, you can follow the techniques that already exist on another modifications I created on this blog. Have a nice try, and good luck!