├── .github
    └── FUNDING.yml
├── README.md
└── src
    ├── add_additional_mime_types_to_media_libary.php
    ├── add_post_images_to_rss_feed.php
    ├── define_excerpt_length.php
    ├── disable_self_pingbacks.php
    ├── embed_responsive_16_to_9_videos.php
    ├── exit_if_direct_access_to_file.php
    ├── fix_php_undefined_index.php
    ├── get_all_tags_from_a_post.php
    ├── get_anything_with_page_id.php
    ├── get_featured_image_from_rest_api.php
    ├── get_number_of_posts_in_term.php
    ├── get_page_id_from_page_title.php
    ├── get_random_post_suggestion_by_categories.php
    ├── get_random_post_suggestion_by_tags.php
    ├── list_authors_alphabetically.php
    ├── remove_inline_styling_from_tag_cloud.php
    ├── show_popular_blog_posts_based_on_cat_shortcode.php
    └── show_related_posts_on_single.php


/.github/FUNDING.yml:
--------------------------------------------------------------------------------
 1 | # These are supported funding model platforms
 2 | 
 3 | github: dalenguyen # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
 4 | patreon: # Replace with a single Patreon username
 5 | open_collective: # Replace with a single Open Collective username
 6 | ko_fi: dalenguyen # Replace with a single Ko-fi username
 7 | tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
 8 | community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
 9 | liberapay: # Replace with a single Liberapay username
10 | issuehunt: # Replace with a single IssueHunt username
11 | otechie: # Replace with a single Otechie username
12 | custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
13 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Useful WordPress Snippets for Web Development
 2 | 
 3 | Below is the list of useful WordPress Snippets that you can use when developing with WordPress.
 4 | 
 5 | + [Add featured image to REST API](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/get_featured_image_from_rest_api.php)
 6 | + [Get page ID from page title](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/get_page_id_from_page_title.php)
 7 | + [Fix Notice Undefined Index](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/fix_php_undefined_index.php)
 8 | + [Get all tags from a post](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/get_all_tags_from_a_post.php)
 9 | + [Get anything with page / post ID](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/get_anything_with_page_id.php)
10 | + [Add additional mime types to media library](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/add_additional_mime_types_to_media_libary.php)
11 | + [Add post images to RSS feed](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/add_post_images_to_rss_feed.php)
12 | + [Define excerpt length](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/define_excerpt_length.php)
13 | + [Disable self pingbacks](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/disable_self_pingbacks.php)
14 | + [Embed responsive 16x9 videos](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/embed_responsive_16_to_9_videos.php)
15 | + [Exit if direct access is made to file](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/exit_if_direct_access_to_file.php)
16 | + [Get number of posts in specified term](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/get_number_of_posts_in_term.php)
17 | + [Get random post suggestion by categories](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/get_random_post_suggestion_by_categories.php)
18 | + [Get random post suggestion by tags](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/get_random_post_suggestion_by_tags.php)
19 | + [Remove inline styling from tag cloud](https://github.com/dalenguyen/wordpress-snippets/blob/master/src/remove_inline_styling_from_tag_cloud.php)
20 | + [Show related posts on single](https://github.com/wajidalitabassum143/wordpress-snippets/blob/master/src/show_related_posts_on_single.php)
21 | + [Shortcode: show popular blog posts based on cat](https://github.com/wajidalitabassum143/wordpress-snippets/blob/master/src/show_popular_blog_posts_based_on_cat_shortcode.php)
22 | + [List all authors of a blog grouped by first name with a single letter as a header character](https://github.com/wajidalitabassum143/wordpress-snippets/blob/master/src/list_authors_alphabetically.php)
23 | 


--------------------------------------------------------------------------------
/src/add_additional_mime_types_to_media_libary.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | function add_custom_mime_types( $mimes ) {
 3 |     $new_file_types = array (
 4 |         'zip'  => 'application/zip',
 5 |         'pdf'  => 'application/pdf',
 6 |         'epub' => 'application/epub+zip',
 7 |         //add more here
 8 |     );
 9 | 
10 |     return array_merge( $mimes,$new_file_types );
11 | }
12 | 
13 | add_filter( 'upload_mimes','add_custom_mime_types' );
14 | 


--------------------------------------------------------------------------------
/src/add_post_images_to_rss_feed.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | function add_post_image_to_rss( $content ) {
 3 |     global $post;
 4 |     if ( has_post_thumbnail( $post->ID ) ) {
 5 |         $content = '<div>' . get_the_post_thumbnail( $post->ID, 'large', array( 'style' => 'margin-bottom: 15px;' ) ) . '</div>' . $content;
 6 |     }
 7 |     return $content;
 8 | }
 9 | 
10 | add_filter( 'the_excerpt_rss', 'add_post_images_to_rss' );
11 | add_filter( 'the_content_feed', 'add_post_images_to_rss' );
12 | 


--------------------------------------------------------------------------------
/src/define_excerpt_length.php:
--------------------------------------------------------------------------------
 1 | // Add this to functions.php
 2 | 
 3 | <?php
 4 | function the_excerpt_max_charlength( $charlength ) {
 5 |     $excerpt = get_the_excerpt();
 6 |     $charlength++;
 7 |     if ( mb_strlen( $excerpt ) > $charlength ) {
 8 |         $subex   = mb_substr( $excerpt, 0, $charlength - 5 );
 9 |         $exwords = explode( ' ', $subex );
10 |         $excut   = - ( mb_strlen( $exwords[ count( $exwords ) - 1 ] ) );
11 |         if ( $excut < 0 ) {
12 |             echo mb_substr( $subex, 0, $excut );
13 |         } else {
14 |             echo $subex;
15 |         }
16 |         echo '...';
17 |     } else {
18 |         echo $excerpt;
19 |     }
20 | }
21 | ?>
22 | 
23 | // use the following snippet in any file to define the length of the excerpt for this file
24 | 
25 | <?php the_excerpt_max_charlength( 250 ); ?>


--------------------------------------------------------------------------------
/src/disable_self_pingbacks.php:
--------------------------------------------------------------------------------
1 | <?php
2 | function disable_self_pingback( &$links ) {
3 |     $home = get_option( 'home' );
4 |     foreach ( $links as $l => $link )
5 |     if ( 0 === strpos( $link, $home ) )
6 |     unset( $links[$l] );
7 | }
8 | add_action( 'pre_ping', 'disable_self_pingback' );


--------------------------------------------------------------------------------
/src/embed_responsive_16_to_9_videos.php:
--------------------------------------------------------------------------------
 1 | function responsive_videos( $html ){
 2 |     $html = preg_replace( '/(width|height)="\d*"\s/', "", $html );
 3 |     return '<div class="embed-responsive embed-responsive-16by9">' . $html . '</div>';
 4 | }
 5 | 
 6 | add_filter( 'embed_oembed_html','evolution_wrap_oembed', 10, 1 );
 7 | 
 8 | //needed CSS Classes
 9 | 
10 | .embed-responsive.embed-responsive-16by9 {
11 |     position: relative;
12 |     padding-bottom: 56.25%; /* 16:9 */
13 |     padding-top: 25px;
14 |     height: 0;
15 | }
16 | 
17 | .embed-responsive.embed-responsive-16by9 iframe {
18 |     position: absolute;
19 |     top: 0;
20 |     left: 0;
21 |     width: 100%;
22 |     height: 100%;
23 | }
24 | 
25 | video {
26 |     width: 100% !important;
27 |     height: auto !important;
28 | }


--------------------------------------------------------------------------------
/src/exit_if_direct_access_to_file.php:
--------------------------------------------------------------------------------
1 | <?php
2 | // Exit if direct access attempt to the file for example with a browser
3 | defined( 'ABSPATH' ) || exit;


--------------------------------------------------------------------------------
/src/fix_php_undefined_index.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | // Put this code in functions.php
 3 | 
 4 | // Get array value
 5 | function idx( $array, $key ) {
 6 |   if ( isset( $array[$key] ) ) {
 7 |     return $array[$key];
 8 |   } else {
 9 |     return NULL;
10 |   }
11 | }
12 | 
13 | // This code can be used anywhere, and will return NULL if value doesn't exist in an Array
14 | // No more Notice for Undefined Index
15 | 


--------------------------------------------------------------------------------
/src/get_all_tags_from_a_post.php:
--------------------------------------------------------------------------------
1 | <?php
2 | // Get an array of tag object from a post id
3 | wp_get_post_tags( get_the_ID() );
4 | 
5 | // Get an array of tags name from a post id
6 | wp_get_post_tags( get_the_ID(), array( 'fields' => 'names' ) ); // ids
7 | 


--------------------------------------------------------------------------------
/src/get_anything_with_page_id.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | // Get the page / post content (easy way)
 3 | echo get_post_field( 'post_content', $page_id );
 4 | 
 5 | // $more_link_text Optional. Content for when there is more text. Default is null
 6 | // $stripteaser Optional. Strip teaser content before the more text. Default is false.
 7 | 
 8 | $post = get_post( $page_id );
 9 | setup_postdata( $post, $more_link_text, $stripteaser );
10 | the_content();
11 | 
12 | // get other info by using ID
13 | get_the_permalink( $page_id );
14 | get_the_title( $page_id );
15 | get_the_post_thumbnail_url( $page_id );
16 | get_the_excerpt( $page_id );
17 | get_the_date( 'l F j, Y', $page_id );
18 | 
19 | // Check if the page is front page or not
20 | get_option( 'page_on_front' ) == $page_id;


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/src/get_featured_image_from_rest_api.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | // Put this code in functions.php or a separate plugin
 3 | 
 4 | add_action( 'rest_api_init', 'register_rest_images' );
 5 | 
 6 | function register_rest_images() {
 7 |     register_rest_field( array( 'post' ),
 8 |         'fimg_url',
 9 |         array(
10 |             'get_callback'    => 'get_rest_featured_image',
11 |             'update_callback' => null,
12 |             'schema'          => null,
13 |         )
14 |     );
15 | }
16 | 
17 | function get_rest_featured_image( $object, $field_name, $request ) {
18 |     if ( $object['featured_media'] ) {
19 |         $img = wp_get_attachment_image_src( $object['featured_media'], 'thumbnail' ); // change 'thumbnail' to other image size if needed
20 |         if ( empty( $img ) ) {
21 |             return false;
22 |         }
23 |         return $img[0];
24 |     }
25 |     return false;
26 | }
27 | 


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/src/get_number_of_posts_in_term.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | //Show the number of posts in an archive page
 3 | 
 4 | //get the term object
 5 | $term = get_queried_object();
 6 | //get the number of posts in that term
 7 | $term->count;
 8 | 
 9 | 
10 | //Show the number of posts of any term by any identifier (e.g. for the term category and the term with id 1)
11 | 
12 | $term = get_term_by( 'id', 1, 'category' );
13 | if ( ! empty( $term ) ) {
14 |     echo $term->count;
15 | }


--------------------------------------------------------------------------------
/src/get_page_id_from_page_title.php:
--------------------------------------------------------------------------------
1 | <?php
2 | // This will return an object of the page
3 | $page = get_page_by_title( 'page-name' );
4 | if ( ! empty( $page ) ) {
5 |     $page_id = $page->ID;
6 | }
7 | 


--------------------------------------------------------------------------------
/src/get_random_post_suggestion_by_categories.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | //get categories of post
 3 | $categories = get_the_terms( get_the_ID(), 'category' );
 4 | 
 5 | if ( ! empty( $categories ) ) {
 6 |     //extract category id's from term objects
 7 |     $cat_ids    = array_column( $categories, 'term_id' );
 8 | 
 9 |     //concat id's to a string with ',' as seperator
10 |     $cat_ids    = implode( ',', $cat_ids );
11 | 
12 |     //get five random posts that are in any category of the current post
13 |     $posts = get_posts( [
14 |         'post_not_in'   => get_the_ID(),
15 |         'cat'           => $cat_ids,
16 |         'order'         => 'ASC',
17 |         'orderby'       => 'rand',
18 |         'post_per_page' => 5
19 |     ] );
20 | }


--------------------------------------------------------------------------------
/src/get_random_post_suggestion_by_tags.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | //get tags of post
 3 | $tags = get_the_tags( get_the_ID() );
 4 | 
 5 | if ( ! empty( $tags ) ) {
 6 |     //extract tag id's from term objects
 7 |     $tag_ids = array_column( $tags, 'term_id' );
 8 | 
 9 |     //get five random posts that are in any tag of the current post
10 |     $posts = get_posts( [
11 |         'post_not_in'   => get_the_ID(),
12 |         'tag__in'       => $tags_string,
13 |         'order'         => 'ASC',
14 |         'orderby'       => 'rand',
15 |         'post_per_page' => 5
16 |     ] );
17 | }


--------------------------------------------------------------------------------
/src/list_authors_alphabetically.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | 
 3 | //* List all authors of a blog grouped by first name with a single letter as a header character.
 4 | 
 5 | function list_authors_alphabetically() {
 6 | 
 7 | 	$users = get_users( 'orderby=user_login&role=author' ); 
 8 | 
 9 | 	$first_letter = '';
10 | 
11 | 	foreach ( $users as $user ) {
12 | 
13 | 		$space  = strpos( $user->user_login, ' ' );
14 | 		$letter = substr( $user->user_login, 0, 1 );
15 | 		$letter = strtoupper( $letter );
16 | 		
17 | 		if ( $letter !== $first_letter ) {
18 | 
19 | 			$first_letter = $letter;
20 | 
21 | 			echo "<h4 id='ft_contrib_alphaletter_$first_letter'> $first_letter </h4>";
22 | 
23 | 		}
24 | 
25 | 		echo '<a href="' . get_author_posts_url( $user->ID, $user->user_nicename ) . '" title="' . $user->display_name . '">' . $user->display_name . '</a>';
26 | 		
27 | 		echo '<br>';
28 | 	}
29 | 
30 | }


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/src/remove_inline_styling_from_tag_cloud.php:
--------------------------------------------------------------------------------
1 | <?php
2 | function remove_tagcloud_inline_styling( $input ) {
3 |     return preg_replace( '/ style=("|\')(.*?)("|\')/', '', $input );
4 | }
5 | 
6 | add_filter( 'wp_generate_tag_cloud', 'remove_tagcloud_inline_styling', 10, 1 );
7 | 


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/src/show_popular_blog_posts_based_on_cat_shortcode.php:
--------------------------------------------------------------------------------
  1 | <?php
  2 | 
  3 | // Popular posts - counting hits.
  4 | 
  5 | /**
  6 |  * Increments the post hit counter.
  7 |  *
  8 |  * @param int $post_id Post ID.
  9 |  *
 10 |  * @return void
 11 |  */
 12 | function wp_popular_posts( $post_id ) {
 13 | 
 14 | 	$count_key = 'popular_posts';
 15 | 
 16 | 	$count = get_post_meta( $post_id, $count_key, true );
 17 | 
 18 | 	if ( '' === $count ) {
 19 | 
 20 | 		delete_post_meta( $post_id, $count_key );
 21 | 
 22 | 		add_post_meta( $post_id, $count_key, '0' );
 23 | 
 24 | 	} else {
 25 | 
 26 | 		$count++;
 27 | 
 28 | 		update_post_meta( $post_id, $count_key, $count );
 29 | 
 30 | 	}
 31 | }
 32 | 
 33 | /**
 34 |  * Tracks post view count.
 35 |  *
 36 |  * @param int|null $post_id Post ID. Use global post if empty.
 37 |  *
 38 |  * @return void
 39 |  */
 40 | function wp_track_posts( $post_id ) {
 41 | 
 42 | 	if ( ! is_single() ) {
 43 | 		return;
 44 | 	}
 45 | 
 46 | 	if ( empty( $post_id ) ) {
 47 | 
 48 | 		global $post;
 49 | 
 50 | 		$post_id = $post->ID;
 51 | 
 52 | 	}
 53 | 
 54 | 	wp_popular_posts( $post_id );
 55 | 
 56 | }
 57 | 
 58 | add_action( 'wp_head', 'wp_track_posts' );
 59 | 
 60 | // Shortcode: display popular posts based on cat.
 61 | add_shortcode( 'popular-posts', 'wp_display_popular_posts' );
 62 | 
 63 | /**
 64 |  * Display popular posts shortcode.
 65 |  *
 66 |  * @param array $attr Shortcode attributes.
 67 |  *
 68 |  * @return false|string
 69 |  */
 70 | function wp_display_popular_posts( $attr ) {
 71 | 
 72 | 	ob_start();
 73 | 
 74 | 	$atts = shortcode_atts(
 75 | 		array(
 76 | 			'num' => 5,
 77 | 			'cat' => '',
 78 | 		),
 79 | 		$attr
 80 | 	);
 81 | 
 82 | 	$temps = explode( ',', $atts['cat'] );
 83 | 
 84 | 	$array = array();
 85 | 
 86 | 	foreach ( $temps as $temp ) {
 87 | 		$array[] = trim( $temp );
 88 | 	}
 89 | 
 90 | 	$cats = ! empty( $cat ) ? $array : '';
 91 | 
 92 | 	echo '<ul class="rp-posts">';
 93 | 
 94 | 	$popular = new WP_Query(
 95 | 		array(
 96 | 			'posts_per_page' => $atts['num'],
 97 | 			'meta_key'       => 'popular_posts',
 98 | 			'orderby'        => 'meta_value_num',
 99 | 			'order'          => 'DESC',
100 | 			'category__in'   => $cats,
101 | 		)
102 | 	);
103 | 
104 | 	while ( $popular->have_posts() ) :
105 | 		$popular->the_post();
106 | 
107 | 		echo '<li><a href="' . esc_url( get_the_permalink() ) . '">' . esc_html( get_the_title() ) . '</a></li>';
108 | 
109 | 	endwhile;
110 | 
111 | 	wp_reset_postdata();
112 | 
113 | 	echo '</ul>';
114 | 
115 | 	return ob_get_clean();
116 | 
117 | }
118 | 


--------------------------------------------------------------------------------
/src/show_related_posts_on_single.php:
--------------------------------------------------------------------------------
 1 | <?php
 2 | 
 3 | // Show related posts @ single post.
 4 | 
 5 | /**
 6 |  * Show random posts from the same categories as the current post.
 7 |  *
 8 |  * @return void
 9 |  */
10 | function related_posts() {
11 | 
12 | 	// current post id.
13 | 	$current_post_id = get_the_ID();
14 | 
15 | 	$related = new WP_Query(
16 | 		array(
17 | 			'category__in'   => wp_get_post_categories( $current_post_id ),
18 | 			'posts_per_page' => 4,
19 | 			'orderby'        => 'rand',
20 | 			'post__not_in'   => array( $current_post_id ), // exclude current post.
21 | 		)
22 | 	);
23 | 
24 | 	if ( $related->have_posts() ) {
25 | 
26 | 		echo '<div class="all-related-posts">';
27 | 
28 | 		while ( $related->have_posts() ) {
29 | 			$related->the_post();
30 | 
31 | 			// entry div structure.
32 | 			echo '<div class="related-post-item">';
33 | 			echo '<div class="post-featured-image">';
34 | 			the_post_thumbnail( 'medium' );
35 | 			echo '</div>';
36 | 			echo '<h3 class="post-title">' . esc_html( get_the_title() ) . '</h3>';
37 | 			echo '<a href="' . esc_url( get_the_permalink() ) . '" class="button">Read More</a>';
38 | 			echo '</div>';
39 | 
40 | 		}
41 | 
42 | 		echo '</div>';
43 | 
44 | 	} else {
45 | 
46 | 		echo '<p>No related post found!!!</p>';
47 | 
48 | 	}
49 | 
50 | 	wp_reset_postdata();
51 | 
52 | }
53 | 


--------------------------------------------------------------------------------