Adds a top-level menu page.

Description

This function takes a capability which will be used to determine whether or not a page is included in the menu.

The function which is hooked in to handle the output of the page must check that the user has the required capability as well.

Parameters

$page_titlestringrequired

The text to be displayed in the title tags of the page when the menu is selected.

$menu_titlestringrequired

The text to be used for the menu.

$capabilitystringrequired

The capability required for this menu to be displayed to the user.

$menu_slugstringrequired

The slug name to refer to this menu by. Should be unique for this menu page and only include lowercase alphanumeric, dashes, and underscores characters to be compatible with sanitize_key() .

$callbackcallableoptional

The function to be called to output the content for this page.

Default:''

$icon_urlstringoptional

The URL to the icon to be used for this menu.

• Pass a base64-encoded SVG using a data URI, which will be colored to match the color scheme. This should begin with 'data:image/svg+xml;base64,'.
• Pass the name of a Dashicons helper class to use a font icon, e.g. 'dashicons-chart-pie'.
• Pass 'none' to leave div.wp-menu-image empty so an icon can be added via CSS.

Default:''

$positionint|floatoptional

The position in the menu order this item should appear.

Default:null

Return

More Information

Notes

• Important Note: Since WordPress 4.4, you do not need to worry about making the position number unique to avoid conflicts. See trac ticket #23316 for more information.
• If you’re running into the “You do not have sufficient permissions to access this page” error, then you’ve hooked too early. The hook you should use is admin_menu.
• If you only want to move existing admin menu items to different positions, you can use the admin_menu hook to unset menu items from their current positions in the global $menu and $submenu variables (which are arrays), and reset them elsewhere in the array.
• This function takes a ‘capability’ (see Roles and Capabilities) which will be used to determine whether or not a page is included in the menu. The function which is hooked in to handle the output of the page must check that the user has the required ‘capability’ as well.
• If you are using the Settings API to save data, and need the user to be other than the administrator, will need to modify the permissions via the hook option_page_capability_{$option_group}, where $option_group is the same as option_group in register_setting() . Check out the Settings API.

Menu Structure

Default: bottom of menu structure

• 2 – Dashboard
• 4 – Separator
• 5 – Posts
• 10 – Media
• 15 – Links
• 20 – Pages
• 25 – Comments
• 59 – Separator
• 60 – Appearance
• 65 – Plugins
• 70 – Users
• 75 – Tools
• 80 – Settings
• 99 – Separator

For the Network Admin menu, the values are different:

• 2 – Dashboard
• 4 – Separator
• 5 – Sites
• 10 – Users
• 15 – Themes
• 20 – Plugins
• 25 – Settings
• 30 – Updates
• 99 – Separator

Source

function add_menu_page( $page_title, $menu_title, $capability, $menu_slug, $callback = '', $icon_url = '', $position = null ) {
	global $menu, $admin_page_hooks, $_registered_pages, $_parent_pages;

	$menu_slug = plugin_basename( $menu_slug );

	$admin_page_hooks[ $menu_slug ] = sanitize_title( $menu_title );

	$hookname = get_plugin_page_hookname( $menu_slug, '' );

	if ( ! empty( $callback ) && ! empty( $hookname ) && current_user_can( $capability ) ) {
		add_action( $hookname, $callback );
	}

	if ( empty( $icon_url ) ) {
		$icon_url   = 'dashicons-admin-generic';
		$icon_class = 'menu-icon-generic ';
	} else {
		$icon_url   = set_url_scheme( $icon_url );
		$icon_class = '';
	}

	$new_menu = array( $menu_title, $capability, $menu_slug, $page_title, 'menu-top ' . $icon_class . $hookname, $hookname, $icon_url );

	if ( null !== $position && ! is_numeric( $position ) ) {
		_doing_it_wrong(
			__FUNCTION__,
			sprintf(
				/* translators: %s: add_menu_page() */
				__( 'The seventh parameter passed to %s should be numeric representing menu position.' ),
				'<code>add_menu_page()</code>'
			),
			'6.0.0'
		);
		$position = null;
	}

	if ( null === $position || ! is_numeric( $position ) ) {
		$menu[] = $new_menu;
	} elseif ( isset( $menu[ (string) $position ] ) ) {
		$collision_avoider = base_convert( substr( md5( $menu_slug . $menu_title ), -4 ), 16, 10 ) * 0.00001;
		$position          = (string) ( $position + $collision_avoider );
		$menu[ $position ] = $new_menu;
	} else {
		/*
		 * Cast menu position to a string.
		 *
		 * This allows for floats to be passed as the position. PHP will normally cast a float to an
		 * integer value, this ensures the float retains its mantissa (positive fractional part).
		 *
		 * A string containing an integer value, eg "10", is treated as a numeric index.
		 */
		$position          = (string) $position;
		$menu[ $position ] = $new_menu;
	}

	$_registered_pages[ $hookname ] = true;

	// No parent as top level.
	$_parent_pages[ $menu_slug ] = false;

	return $hookname;
}

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