Firstly, a bare bones PHP class. Add this in it’s own file, eg mynewclass.php, and include it in functions.php
<?php
class MyNewClassName
{
public function __construct()
{
}
}
$mynewclass=new MyNewClassName();
?>Now a slightly more sophisticated one to add an admin menu item and page, with page tabs.
<?php
class MyNewClassName
{
protected $admin_page_url;
public function __construct()
{
$this->admin_page_url="my-new-class";
add_action("admin_menu",array($this,"my_new_class_admin_menu"));
}
function my_new_class_admin_menu()
{
add_menu_page("My New Class","My New Class","manage_options",$this->admin_page_url,array($this,"my_new_class_page_contents"),"dashicons-schedule",3);
}
function my_new_class_page_contents()
{
$default_tab = 'general';
$tab = isset($_GET['tab']) ? $_GET['tab'] : $default_tab;
echo "<div class='wrap'>";
echo "<h1>".esc_html( get_admin_page_title())."</h1>";
echo '<nav class="nav-tab-wrapper">';
?>
<a href="?page=<?php echo $this->admin_page_url;?>&tab=general" class="nav-tab <?php if($tab==='general'):?>nav-tab-active<?php endif; ?>">General</a>
<?php
echo '</nav>';
echo '<div class="tab-content">';
switch($tab) :
case 'general':
echo $this->general_tab();
break;
default:
break;
endswitch;
echo '</div>';
}
function general_tab()
{
echo "<div>";
echo "<p>hello world!</p>";
echo "</div>";
}
}
$mynewclass=new MyNewClassName();
?>