Page 474 - Beginning PHP 5.3

Part III: Using PHP in Practice
Next, the script makes a decision about which function to call. If the Save Changes button was
clicked, saveMember() is called to update the member record in the database. If Delete Member was
clicked, deleteMember() is called to remove the member from the database. Otherwise,
displayForm() is called to display the member details form and access log records. The script passes
the retrieved $member object to displayForm() so that its data can be displayed.

The displayForm() function works in a similar way to its counterpart in the register.php script you
created earlier in the chapter. First it retrieves the list of LogEntry objects pertaining to the member in
question, and stores them in a $logEntries array. After displaying the page header, the function
outputs any error messages at the top of the page.

Next, displayForm() retrieves the start and order parameters from either the query string or the
form post, and stores them in $start and $order . Then the form itself is displayed. The form includes
three hidden fields:

< input type=”hidden” name=”memberId” id=”memberId” value=” < ?php echo $member-
> getValueEncoded( “id” ) ? > ” / >
< input type=”hidden” name=”start” id=”start” value=” < ?php echo $start ? > ” / >
< input type=”hidden” name=”order” id=”order” value=” < ?php echo $order ? > ” / >
memberId tracks the ID of the member being viewed or edited, and start and order propagate their
respective values from the member list page, so that the administrator can return to the same point in the
member list after viewing or editing the member.

The rest of the form works much like it does in register.php . Each form field is displayed, using
Member::getValueEncoded() , setChecked() , and setSelected() to retrieve the data from the Member
object and display it. The bottom of the form contains a Save Changes button and a Delete Member button.
After the form, the access log details are displayed in the same way as the old view_member.php script.
The Back link at the bottom of the form works slightly differently than register.php . Because you
don ’ t know how many times the administrator has submitted the form, you can ’ t use a JavaScript
function call to move back one page to the members list page, as register.php did. So instead you
construct a new link to return to view_members.php , passing in the $start and $order values as
start and order query string parameters, in order to return the administrator to the same point in the
members list.

saveMember() checks the member data that was submitted in the form and, if valid, updates the
member record in the database. It works much like processForm() in register.php . A new Member
object is created that contains the filtered values sent from the form. If any required fields were missing,
or if the chosen username or email address is already used by another member, an error message is
generated, and the form is redisplayed by calling displayForm() .
If all went well, the member record is updated by calling $member - > update() , and a success message is

displayed by calling displaySuccess() . Note that, thanks to the design of the Member::update()
method, the administrator can leave the password field blank in order to retain the member ’ s existing
password.

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