Various common Wordpress Snippets

Wordpress Snippets

<?php // Load in WP functions outside of wordpress
define('WP_USE_THEMES', false);
require('/home/kindyhub/public_html/wp-blog-header.php'); ?>

add_action('wp_enqueue_scripts', 'no_more_jquery');
function no_more_jquery(){
  //if(!is_bbpress()) { //sample condition inside function
    wp_deregister_script('jquery');
  //}
}

$args = array(
    'meta_key' => '_wp_page_template',
    'meta_value' => 'pages-yachts.php',
    'hierarchical' => 0,
);
$pages = get_pages($args);

<?php $headerImages = get_uploaded_header_images();
			$headerImages = shuffle($headerImages); //randomize 
		    foreach($headerImages as $headerImage) {

		    	print_r($headerImage); ?>
		        
		    <?php } ?>


if(is_user_logged_in() && current_user_can('manage_options')){ 
// user is logged in && admin
}
else {
//not admin or logged in
	header('Location: ' . get_site_url());
	exit;
}

is_page_template('pages-listings-property.php');
get_page_template_slug($page->ID) == 'pages-news.php');

//get page ids based on templates used 
$the_query = new WP_Query(array(
    'post_type'  => 'page',
    'meta_key'   => '_wp_page_template',
    'meta_value' => 'templates/_partner.php'
));


//add menu item under appearance for editors
$role_object = get_role( 'editor' );
$role_object->add_cap( 'edit_theme_options' );
if (!current_user_can('activate_plugins')) {
    function hide_menu() {
        remove_submenu_page( 'themes.php', 'themes.php' ); // hide the theme selection submenu
        remove_submenu_page( 'themes.php', 'widgets.php' ); // hide the widgets submenu
        remove_submenu_page( 'themes.php', 'customize.php' ); // hide the widgets submenu
        remove_submenu_page('themes.php', 'nav-menus.php'); // hide the menus submenu
    }
    add_action('admin_head', 'hide_menu');
}


post_password_required( $post );

if(is_page('private-media') || in_category('private-media')) { 
    echo '<meta name="robots" content="noindex, nofollow" />'; 
}

global  $post;
if  ($post->post_parent && post_password_required($post->post_parent)) {
  wp_redirect(get_permalink($post->post_parent));
}

//better way to include template files with variables in scope in parent or child theme
include(locate_template('your-template-name.php'));

//format post_content
$page_id = 4;
$page = get_page($page_id);
echo apply_filters('the_content', $page->post_content);

// remove images from post_content
$content = get_the_content();
$postOutput = preg_replace('/<img[^>]+./','', $content);


<?php $args = array(
		'posts_per_page' => -1,
		'orderby' => 'menu_order',
		'order' => 'ASC',
		'post_type' => 'attachment',
		'post_mime_type' => 'image',
		'post_parent' => $post->ID,
	);
	$images = get_posts($args);
	foreach ($images as $image) {
		if($image->post_title == 'feature'){
			list($url, $width, $height) = wp_get_attachment_image_src($image->ID, 'thumbnail'); ?>
			<img src="<?php echo $url; ?>" alt="<?php echo $post->post_title; ?>">
		<?php }
	} ?>


<?php $args = array(
					'post_type' => 'offer',
					'paged' => $paged,
				);
				$offerQuery = new WP_Query($args);
				if($offerQuery->have_posts()) { ?>
					<div class="offersContainer articleContainer">
						<?php while ( $offerQuery->have_posts() ) : $offerQuery->the_post(); include(locate_template('includes/includes-post.php'));
						endwhile;

						if ($offerQuery->max_num_pages > 1) { ?>
							<div class="navBelow navigation">
								<div class="pageNav navPrevious animate"><?php next_posts_link('Older'); ?></div>
								<div class="pageNav navNext animate"><?php previous_posts_link('Newer'); ?></div>
							</div><!--END NavBelow-->
						<?php }
						wp_reset_postdata(); ?>
					</div><!--END BlogContainer-->
				<?php } ?>



//remove admin bar for all but admin/editors
add_action('after_setup_theme', 'remove_admin_bar');
function remove_admin_bar() {
if (!current_user_can('edit_pages')) {
  add_filter('show_admin_bar', '__return_false');
}
}


// record page load and queries
add_action( 'wp_footer', 'tcb_note_server_side_page_speed' );
function tcb_note_server_side_page_speed() {
  date_default_timezone_set( get_option( 'timezone_string' ) );
  $content  = '[ ' . date( 'Y-m-d H:i:s T' ) . ' ] ';
  $content .= 'Page created in ';
  $content .= timer_stop( $display = 0, $precision = 2 );
  $content .= ' seconds from ';
  $content .= get_num_queries();
  $content .= ' queries';
  if( ! current_user_can( 'administrator' ) ) $content = "<!-- $content -->";
  echo $content;
}



/**
 * Restricts certain menu items from appearing the WP Admin area. Does not
 * affect Administrator users.
 *
 * @action admin_menu
 */
function my_restrict_admin_menu_items() {
    // Don't restrict Administrator users.
    if(current_user_can( 'manage_options')){
        return;
    }

    // Array of the menu item slugs you want to remove.
    $restricted = array(
        'menu-comments', // Comments (slug is ID of nav item)
        'menu-tools', // Tools(slug is ID of nav item)
    );
    global $menu;

    foreach ($menu as $item => $data) {
        if (!isset($data[5])) {
            continue; // Move along if the current $item doesn't have a slug.
        }
        elseif (in_array( $data[5], $restricted)) {
            unset($menu[$item]); // Remove the current $item from the $menu.
        }
    }
}
add_action('admin_menu', 'my_restrict_admin_menu_items');

//redirect page within wp-admin
function feature_bookings_preprocess_pages($value){
	    global $pagenow;
	    $page = (isset($_REQUEST['page']) ? $_REQUEST['page'] : false);
	    if($pagenow == 'admin.php' && $page == 'feature-bookings'){
	        wp_redirect('http://google.com');
	        exit;
	    }
	}
	add_action('admin_init', 'feature_bookings_preprocess_pages');
	
	
	
	/*-------------------------------------------------------------------------------------*/
/* Login Hooks and Filters for custom login redirects
/*-------------------------------------------------------------------------------------*/
if( ! function_exists( 'custom_login_fail' ) ) {
    function custom_login_fail( $username ) {
        $referrer = $_SERVER['HTTP_REFERER']; // where did the post submission come from?
        // if there's a valid referrer, and it's not the default log-in screen
        if ( !empty($referrer) && !strstr($referrer,'wp-login') && !strstr($referrer,'wp-admin') ) {
            if ( !strstr($referrer,'?login=failed') ) { // make sure we don’t append twice
                wp_redirect( $referrer . '?login=failed' ); // append some information (login=failed) to the URL for the theme to use
            } else {
                wp_redirect( $referrer );
            }
            exit;
        }
    }
}
add_action( 'wp_login_failed', 'custom_login_fail' ); // hook failed login
if( ! function_exists( 'custom_login_empty' ) ) {
    function custom_login_empty(){
        $referrer = $_SERVER['HTTP_REFERER'];
        if ( strstr($referrer,get_home_url()) && $user==null ) { // mylogin is the name of the loginpage.
            if ( !strstr($referrer,'?login=empty') ) { // prevent appending twice
                wp_redirect( $referrer . '?login=empty' );
            } else {
                wp_redirect( $referrer );
            }
        }
    }
}
add_action( 'authenticate', 'custom_login_empty');


//embed video using wordpress player 
global $wp_embed;
									/**
									 * Replace the global $post with a fake ID (a really crazy one!)
									 * or else WP_Embed::autoembed() will skip the oEmbed check
									 * for some reason.
									 **/
									global $post;
									$oldpost = $post;
									$post = new stdClass();
									$post->ID = PHP_INT_MAX;

									// Process oEmbeds
									echo $wp_embed->autoembed( do_shortcode('https://www.youtube.com/watch?v=waYqBVqZQEU') );

									// Restore the original $post
									$post = $oldpost;

Hi,
I'm trying your snippet //add menu item under appearance for editors
I added it to my theme's functions.php file but it doesn't work.
Any clue what can go wrong?
Thanks