jeremyfelt · November 1, 2024 14:27
diff --git a/powerful-code-snippets.php b/powerful-code-snippets.php
 <?php
 // Powerful Code Snippets (will there be 10?)

 add_action( 'init', 'puwwp_register_post_type' );
 /**
 * Registering a custom post type provides many out of
 * the box defaults new types of content.
 */
 function puwwp_register_post_type() {
 	$labels = array(); // array of labels
 	$args = array(
 		'labels' => $labels,
 		'description' => 'WordPress Meetups',
 		'public' => true,
 		'hierarchical' => false,
 		'menu_icon' => 'dashicons-heart',
 		'supports' => array (
 			'title',
 			'editor',
 			'revisions',
 			'thumbnail',
 		),
 		'has_archive' => true,
 		'rewrite' => array(
 			'slug' => 'meetups',
 			'with_front' => false
 		),
 	);

 	// https://example.org/meetups/february-meetup/
 	// https://example.org/meetups/
 	
 	// The post type slug can be up to 20 characters.
 	register_post_type( 'puwwp-meetup', $args );
 }

 add_action( 'add_meta_boxes', 'puwwp_add_meetup_meta_boxes', 10, 1 );
 /**
 * Add meta boxes to the current view.
 */
 function puwwp_add_meetup_meta_boxes() {
 	add_meta_box( 'puwwp-meetup-meta', 'Meetup Data', 'puwwp_display_meetup_meta', 'puwwp-meetup' );
 }

 /**
 * Display the meta box that was added above.
 */
 function puwwp_display_meetup_meta( $post ) {
 	// A very powerful feature in WordPress is nonce management.
 	wp_nonce_field( 'save-extra-meetup-data', '_puwwp_extra_nonce' );

 	// Post meta stores extra data about an item in a table.
 	$extra_data = get_post_meta( $post->ID, 'puwwp_extra_data', true );
 	?>
 	<label for="puwwp-extra-data">Extra Data:</label>
 	<p class="description">This is some extra data about the meetup.</p>
 	<textarea id="puwwp-extra-data" name="puwwp_extra_data"><?php echo esc_textarea( $extra_data ); ?></textarea>
 <?php
 }

 add_action( 'save_post', 'puwwp_save_meetup_meta', 10, 2 );
 /**
 * Whenever a post is saved, make sure the meta data is handled
 * as well.
 */
 function puwwp_save_meetup_meta( $post_id, $post ) {
 	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
 		return;
 	}

 	if ( ! isset( $_POST['_puwwp_extra_nonce'] )
 	     || false === wp_verify_nonce( $_POST['_puwwp_extra_nonce'], 'save-extra-meetup-data' ) ) {
 		return;
 	}

 	if ( 'auto-draft' === $post->post_status ) {
 		return;
 	}

 	// Update or delete post meta and take advantage of wp_kses_post
 	// when storing it.
 	if ( isset( $_POST['puwwp_extra_data'] ) && '' !== trim( $_POST['puwwp_extra_data'] ) ) {
 		update_post_meta( $post_id, 'puwwp_extra_data', wp_kses_post( $_POST['wsuwp_extra_data'] ) );
 	} else {
 		delete_post_meta( $post_id, 'puwwp_extra_data' );
 	}
 }

 add_filter( 'manage_puwwp-meetup_columns', 'puwwp_manage_meetup_columns' );
 /**
 * Add an extra column to the list table showing meetups that
 * contains the extra data being stored.
 */
 function puwwp_manage_meetup_columns( $posts_columns ) {
 	$posts_columns['extra_data'] = 'Extra Data';

 	return $posts_columns;
 }

 add_action( 'manage_puwwp-meetup_custom_column', 'puwwp_manage_meetup_custom_columns', 10, 2 );
 /**
 * When the extra column is displayed, retrieve the post meta that is
 * stored for the specific post.
 */
 function puwwp_manage_meetup_custom_columns( $column_name, $post_id ) {
 	if ( 'extra_data' === $column_name ) {
 		$extra_data = get_post_meta( $post_id, 'puwwp_extra_data', true );
 		echo esc_html( $extra_data );
 	}
 }

 add_action( 'init', 'puwwp_register_taxonomy' );
 /**
 * Registering a custom taxonomy also provides many things out of the box
 * for a new way of categorizing content.
 */
 function puwwp_register_taxonomy() {
 	$args = array(
 		'labels' => array( 'name' => 'Meetup Type' ),
 		'hierarchical' => true,
 		'show_ui' => true,
 		'show_admin_column' => true,
 		'query_var' => true,
 		'rewrite' => array( 'slug' => 'meetup-type' ),
 	);
 	
 	// https://example.org/meetup-type/presentation/
 	
 	// The taxonomy slug can be up to 20 characters.
 	register_taxonomy( 'puwwp-meetup-type', $args );
 }

 add_action( 'wp_head', 'puwp_output_header_data' );
 /**
 * The wp_head action can be used for outputting any sort of
 * data that should exist in <head></head> in your HTML.
 */
 function puwp_output_header_data() {
 	?>
 	<meta property="og:title" content="WordPress Meetups" />
 	<meta property="og:description" content="This is a listing of our WordPress Meetups" />
 	<?php
 }

 add_action( 'pre_get_posts', 'puwwp_modify_query', 10, 1 );
 /**
 * pre_get_posts is a powerful action as it allows you to hook in
 * immediately before a query is performed to alter the query.
 */
 function puwwp_modify_query( $query ) {
 	// Only show 2 posts per page when viewing a meetup type archive.
 	if ( $query->is_main_query() && $query->is_tax( 'puwwp-meetup-type' ) ) {
 		$query->set( 'posts_per_page', 2 );
 	}
 	
 	// Sort an archive of meetups by the extra data.
 	if ( $query->is_main_query() && $query->is_post_type_archive( 'puwwp-meetup' ) ) {
 		$query->set( 'meta_key', 'puwwp_extra_data' );
 		$query->set( 'orderby', 'meta_value' );
 		$query->set( 'order', 'ASC' );
 	}
 }

 add_filter( 'body_class', 'puwwp_add_body_classes', 10, 1 );
 /**
 * Several filters like body_class exist as a way to tweak small
 * parts of code for big results.
 */
 function puwwp_add_body_classes( $classes ) {
 	// Add an extra class to <body> if the meetup has extra data.
 	if ( is_singular( 'puwwp-meetup' ) ) {
 		if ( get_post_meta( get_the_ID(), 'puwwp_extra_data', true ) ) {
 			$classes[] = 'has-extra-data';
 		}
 	}
 	
 	return $classes;
 }

 add_action( 'after_setup_theme', 'puwwp_additional_image_sizes', 10 );
 /**
 * Harnessing post thumbnails (featured images) and different image
 * sizes is much easier than it may seem.
 */
 function puwwp_additional_image_sizes() {
 	add_theme_support( 'post-thumbnails' );
 	set_post_thumbnail_size( 198, 198, true );
 	add_image_size( 'puwwp-small', 400, 99999 );
 	add_image_size( 'puwwp-medium', 800, 99999 );
 	add_image_size( 'puwwp-large', 1200, 99999 );
 	add_image_size( 'puwwp-xlarge', 1600, 99999 );
 }

 // What do you want to see?
	<?php
	// Powerful Code Snippets (will there be 10?)

	add_action( 'init', 'puwwp_register_post_type' );
	/**
	* Registering a custom post type provides many out of
	* the box defaults new types of content.
	*/
	function puwwp_register_post_type() {
	$labels = array(); // array of labels
	$args = array(
	'labels' => $labels,
	'description' => 'WordPress Meetups',
	'public' => true,
	'hierarchical' => false,
	'menu_icon' => 'dashicons-heart',
	'supports' => array (
	'title',
	'editor',
	'revisions',
	'thumbnail',
	),
	'has_archive' => true,
	'rewrite' => array(
	'slug' => 'meetups',
	'with_front' => false
	),
	);

	// https://example.org/meetups/february-meetup/
	// https://example.org/meetups/

	// The post type slug can be up to 20 characters.
	register_post_type( 'puwwp-meetup', $args );
	}

	add_action( 'add_meta_boxes', 'puwwp_add_meetup_meta_boxes', 10, 1 );
	/**
	* Add meta boxes to the current view.
	*/
	function puwwp_add_meetup_meta_boxes() {
	add_meta_box( 'puwwp-meetup-meta', 'Meetup Data', 'puwwp_display_meetup_meta', 'puwwp-meetup' );
	}

	/**
	* Display the meta box that was added above.
	*/
	function puwwp_display_meetup_meta( $post ) {
	// A very powerful feature in WordPress is nonce management.
	wp_nonce_field( 'save-extra-meetup-data', '_puwwp_extra_nonce' );

	// Post meta stores extra data about an item in a table.
	$extra_data = get_post_meta( $post->ID, 'puwwp_extra_data', true );
	?>
	<label for="puwwp-extra-data">Extra Data:</label>
	<p class="description">This is some extra data about the meetup.</p>
	<textarea id="puwwp-extra-data" name="puwwp_extra_data"><?php echo esc_textarea( $extra_data ); ?></textarea>
	<?php
	}

	add_action( 'save_post', 'puwwp_save_meetup_meta', 10, 2 );
	/**
	* Whenever a post is saved, make sure the meta data is handled
	* as well.
	*/
	function puwwp_save_meetup_meta( $post_id, $post ) {
	if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
	return;
	}

	if ( ! isset( $_POST['_puwwp_extra_nonce'] )
	\|\| false === wp_verify_nonce( $_POST['_puwwp_extra_nonce'], 'save-extra-meetup-data' ) ) {
	return;
	}

	if ( 'auto-draft' === $post->post_status ) {
	return;
	}

	// Update or delete post meta and take advantage of wp_kses_post
	// when storing it.
	if ( isset( $_POST['puwwp_extra_data'] ) && '' !== trim( $_POST['puwwp_extra_data'] ) ) {
	update_post_meta( $post_id, 'puwwp_extra_data', wp_kses_post( $_POST['wsuwp_extra_data'] ) );
	} else {
	delete_post_meta( $post_id, 'puwwp_extra_data' );
	}
	}

	add_filter( 'manage_puwwp-meetup_columns', 'puwwp_manage_meetup_columns' );
	/**
	* Add an extra column to the list table showing meetups that
	* contains the extra data being stored.
	*/
	function puwwp_manage_meetup_columns( $posts_columns ) {
	$posts_columns['extra_data'] = 'Extra Data';

	return $posts_columns;
	}

	add_action( 'manage_puwwp-meetup_custom_column', 'puwwp_manage_meetup_custom_columns', 10, 2 );
	/**
	* When the extra column is displayed, retrieve the post meta that is
	* stored for the specific post.
	*/
	function puwwp_manage_meetup_custom_columns( $column_name, $post_id ) {
	if ( 'extra_data' === $column_name ) {
	$extra_data = get_post_meta( $post_id, 'puwwp_extra_data', true );
	echo esc_html( $extra_data );
	}
	}

	add_action( 'init', 'puwwp_register_taxonomy' );
	/**
	* Registering a custom taxonomy also provides many things out of the box
	* for a new way of categorizing content.
	*/
	function puwwp_register_taxonomy() {
	$args = array(
	'labels' => array( 'name' => 'Meetup Type' ),
	'hierarchical' => true,
	'show_ui' => true,
	'show_admin_column' => true,
	'query_var' => true,
	'rewrite' => array( 'slug' => 'meetup-type' ),
	);

	// https://example.org/meetup-type/presentation/

	// The taxonomy slug can be up to 20 characters.
	register_taxonomy( 'puwwp-meetup-type', $args );
	}

	add_action( 'wp_head', 'puwp_output_header_data' );
	/**
	* The wp_head action can be used for outputting any sort of
	* data that should exist in <head></head> in your HTML.
	*/
	function puwp_output_header_data() {
	?>
	<meta property="og:title" content="WordPress Meetups" />
	<meta property="og:description" content="This is a listing of our WordPress Meetups" />
	<?php
	}

	add_action( 'pre_get_posts', 'puwwp_modify_query', 10, 1 );
	/**
	* pre_get_posts is a powerful action as it allows you to hook in
	* immediately before a query is performed to alter the query.
	*/
	function puwwp_modify_query( $query ) {
	// Only show 2 posts per page when viewing a meetup type archive.
	if ( $query->is_main_query() && $query->is_tax( 'puwwp-meetup-type' ) ) {
	$query->set( 'posts_per_page', 2 );
	}

	// Sort an archive of meetups by the extra data.
	if ( $query->is_main_query() && $query->is_post_type_archive( 'puwwp-meetup' ) ) {
	$query->set( 'meta_key', 'puwwp_extra_data' );
	$query->set( 'orderby', 'meta_value' );
	$query->set( 'order', 'ASC' );
	}
	}

	add_filter( 'body_class', 'puwwp_add_body_classes', 10, 1 );
	/**
	* Several filters like body_class exist as a way to tweak small
	* parts of code for big results.
	*/
	function puwwp_add_body_classes( $classes ) {
	// Add an extra class to <body> if the meetup has extra data.
	if ( is_singular( 'puwwp-meetup' ) ) {
	if ( get_post_meta( get_the_ID(), 'puwwp_extra_data', true ) ) {
	$classes[] = 'has-extra-data';
	}
	}

	return $classes;
	}

	add_action( 'after_setup_theme', 'puwwp_additional_image_sizes', 10 );
	/**
	* Harnessing post thumbnails (featured images) and different image
	* sizes is much easier than it may seem.
	*/
	function puwwp_additional_image_sizes() {
	add_theme_support( 'post-thumbnails' );
	set_post_thumbnail_size( 198, 198, true );
	add_image_size( 'puwwp-small', 400, 99999 );
	add_image_size( 'puwwp-medium', 800, 99999 );
	add_image_size( 'puwwp-large', 1200, 99999 );
	add_image_size( 'puwwp-xlarge', 1600, 99999 );
	}

	// What do you want to see?
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