Sindbad~EG File Manager

<?php 
/*
 * Security 	: blocking direct access
 * Source		: http://codex.wordpress.org/Theme_Development#Template_Files
*/
defined('ABSPATH') or die("Access Restricted");

/*
 * AMP : Register Metabox
*/
add_action('add_meta_boxes','amp_init_metabox');
function amp_init_metabox(){
  add_meta_box('mwp_amp_skip', 'AMP', 'mwp_amp_skip', 'post', 'side');
}

/*
 * AMP : Metabox Checked
*/
function field_checked($cible,$test){
  if(in_array($test,$cible)){return ' checked="checked" ';}
}

/*
 * AMP : Metabox fields
*/
function mwp_amp_skip($post){
	$mwpampskip = get_post_meta($post->ID, '_mwp_amp_skip', false);

	echo '<label style="padding:0 5px;"><input type="checkbox" ' . field_checked( $mwpampskip, 1 ) . ' name="mwpampskip[]" value="1" /></label>';
	_e( 'Disable AMP for This Post', MWP_TEXT_DOMAIN );

}

/*
 * AMP : Save MetaBox
*/
function save_amp_metabox($post_id){
	if(isset($_POST['mwpampskip'])){
		delete_post_meta($post_id, '_mwp_amp_skip');
		foreach($_POST['mwpampskip'] as $c){
			add_post_meta($post_id, '_mwp_amp_skip', intval($c) );
		}
	}
}
add_action('save_post','save_amp_metabox');