wp php admin add page

addpage.php

<?php 
//****************admin*********************
//страница настроек 
add_action('admin_menu', 'compare_cars_wc_submenu_page_url', 999);

function compare_cars_wc_submenu_page_url() {
  add_submenu_page( 'edit.php?post_type=pixad-autos', __('Compare page', 'compare_cars'), _x('Compare page', 'menu', 'compare_cars'), 'manage_options', 'compare-cars', 'compare_cars_submenu_page' );
}

function compare_cars_submenu_page(){

	?>
	<div class="wrap">
		<h3><?php echo get_admin_page_title() ?></h3>

		<form action="options.php" method="POST">
			<?php
				settings_fields( 'compare_opt_gr' ); 
				do_settings_sections( 'compare_page1' );
				submit_button();
			?>
		</form>
	</div>
	<?php
}

add_action('admin_init', 'compare_cars_settings_page');
function compare_cars_settings_page(){

	register_setting( 'compare_opt_gr', 'compare_cars_templ', 'compare_sanitize_clb' );
	add_settings_section( 'section_id',  __('Compare settings', 'compare_cars'), '', 'compare_page1' ); 
	add_settings_field('primer_field1', __('Select compare page', 'compare_cars'), 'compare_fields_display', 'compare_page1', 'section_id' );
	add_settings_field('compare_field_favorite',  __('Not use favorite', 'compare_cars'), 'compare_fields_favorite', 'compare_page1', 'section_id' );
	add_settings_field('compare_field_resize',  __('Resize', 'compare_cars'), 'compare_fields_resize', 'compare_page1', 'section_id' );
}

function compare_fields_display(){

	$val = get_option('compare_cars_templ'); 
	$template = !empty($val['template']) ? $val['template'] : -1;
	?>

	<select name="compare_cars_templ[template]"> 
	 <option value="-1">
	<?php echo esc_attr( __( 'Select page', 'compare_cars' ) ); ?></option> 
	 <?php 
	  $pages = get_pages(); 
	  foreach ( $pages as $page ) {
			$option = '<option value="' .  $page->ID . '" ' . selected( $template, $page->ID ) . '>';
			$option .= $page->post_title;
			$option .= '</option>';
			echo $option;
	  }
	 ?>
	</select>

	<?php
}
function compare_fields_favorite(){

	$val = get_option('compare_cars_templ'); 
	$no_favorite = !empty($val['no_favorite']) ? $val['no_favorite'] : false;
	?>
	<label><input type="checkbox" name="compare_cars_templ[no_favorite]" value="1" <?php checked( 1, $no_favorite ) ?> /></label>
	<?php
}
function compare_fields_resize(){

	$val = get_option('compare_cars_templ'); 
	$resize = !empty($val['resize']) ? $val['resize'] : false;
	?>
	<label><input type="checkbox" name="compare_cars_templ[resize]" value="1" <?php checked( 1, $resize ) ?> /></label>
	<?php
}

function compare_sanitize_clb( $options ){ 

	return $options;
}
//****************end admin*********************