PLUGIN-DEV - TOP LEVEL ADMIN MENU WITH SUB MENUS

gistfile1.txt

function page_callback_function() {
	
	// check if user is allowed access
	if ( ! current_user_can( 'manage_options' ) ) return;
	
	?>
	
	<div class="wrap">
		<h1><?php echo esc_html( get_admin_page_title() ); ?></h1>
		<form action="options.php" method="post">
			
			<?php
			
			// output security fields
			settings_fields( 'myplugin_options' );
			
			// output setting sections
			do_settings_sections( 'myplugin' );
			
			// submit button
			submit_button();
			
			?>
			
		</form>
	</div>
	
	<?php
	
}

function page_callback_function1() {
	
	// check if user is allowed access
	if ( ! current_user_can( 'manage_options' ) ) return;
	
	?>
	
	<div class="wrap">
		<h1><?php echo esc_html( get_admin_page_title() ); ?></h1>
		<form action="options.php" method="post">
			
			<?php
			
			// output security fields
			settings_fields( 'myplugin_options' );
			
			// output setting sections
			do_settings_sections( 'myplugin' );
			
			// submit button
			submit_button();
			
			?>
			
		</form>
	</div>
	
	<?php
	
}

function page_callback_function2() {
	
	// check if user is allowed access
	if ( ! current_user_can( 'manage_options' ) ) return;
	
	?>
	
	<div class="wrap">
		<h1><?php echo esc_html( get_admin_page_title() ); ?></h1>
		<form action="options.php" method="post">
			
			<?php
			
			// output security fields
			settings_fields( 'myplugin_options' );
			
			// output setting sections
			do_settings_sections( 'myplugin' );
			
			// submit button
			submit_button();
			
			?>
			
		</form>
	</div>
	
	<?php
	
}

// add top-level administrative menu
function myplugin_add_toplevel_menu() {
	

	add_menu_page( 'Page Title', 'Menu Title', 'manage_options', 'menu_slug', 'page_callback_function', 'dashicons-media-spreadsheet' );
	add_submenu_page( 'menu_slug', 'Page Title 1', 'Sub-menu 1 Title', 'manage_options', 'submenu1_slug', 'page_callback_function1' );
	add_submenu_page( 'menu_slug', 'Page Title 2', 'Sub-menu 2 Title', 'manage_options', 'submenu2_slug', 'page_callback_function2' );
	
}
add_action( 'admin_menu', 'myplugin_add_toplevel_menu' );