WordPress Development Complete Course: final quiz

Twelve questions covering the whole WordPress Development Complete Course.

Intermediate
12 questions

12 questions. Pass mark 70%.

Question 1 of 12 A client wants a “Testimonials” post type that must keep working if they switch theme next year. Where should you register it?
- In a plugin, or a must-use plugin
- In the active theme’s functions.php
- In wp-config.php
- In a file inside wp-includes
Question 2 of 12 What does this filter callback do to post titles?
PHP
```
add_filter( 'the_title', 'myplugin_title' );

function myplugin_title( $title ) {
	strtoupper( $title );
}
```
- It empties them, because the callback returns nothing
- It makes them upper case
- Nothing, because filters cannot change titles
Question 3 of 12 Your callback needs both arguments that the save_post action passes: the post ID and the post object. Which call is correct?
- add_action( 'save_post', 'myplugin_save', 10, 2 );
- add_action( 'save_post', 'myplugin_save', 2 );
- add_action( 'save_post', 'myplugin_save' );
Question 4 of 12 In which database table does WordPress store custom field values for posts?
- wp_postmeta
- wp_options
- wp_posts
- wp_termmeta
Question 5 of 12 You registered a custom post type with a new rewrite slug and its URLs return 404. What fixes it?
- Flush the rewrite rules, for example by saving Settings, Permalinks once
- Call flush_rewrite_rules() on every init
- Rename the post type
Question 6 of 12 You need the five latest events for a sidebar and will never paginate them. Which arguments avoid unnecessary work?
PHP
```
$query = new WP_Query( array(
	'post_type'      => 'myplugin_event',
	'posts_per_page' => 5,
	// ?
) );
```
- 'no_found_rows' => true
- 'paged' => 1
- 'nopaging' => true
Question 7 of 12 Which is the right way to change how many posts the main blog archive shows?
- Use the pre_get_posts action and check $query->is_main_query()
- Call query_posts() at the top of the template
- Run a second WP_Query in the template and ignore the main one
Question 8 of 12 Which of these stop a REST route from doing its work for users who cannot edit posts? Choose two.
Select all that apply.
- A permission_callback that returns current_user_can( 'edit_posts' )
- Checking current_user_can( 'edit_posts' ) at the start of the route callback and returning a WP_Error if it fails
- Setting 'permission_callback' => '__return_true'
- Checking is_user_logged_in() only
Question 9 of 12 You print a post meta value inside an HTML attribute. Which is correct?
PHP
```
$colour = get_post_meta( $post_id, 'myplugin_colour', true );
```
- <div class="<?php echo esc_attr( $colour ); ?>">
- <div class="<?php echo esc_html( $colour ); ?>">
- <div class="<?php echo sanitize_text_field( $colour ); ?>">
- <div class="<?php echo $colour; ?>">
Question 10 of 12 Which query is safe when $email comes from user input?
- $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->users} WHERE user_email = %s", $email ) );
- $wpdb->get_row( "SELECT * FROM {$wpdb->users} WHERE user_email = '$email'" );
- $wpdb->get_row( "SELECT * FROM wp_users WHERE user_email = '" . esc_html( $email ) . "'" );
Question 11 of 12 What happens to a transient after its expiry time has passed?
- get_transient() returns false, so your code rebuilds the value
- WordPress rebuilds the value automatically in the background
- The value is kept forever until you delete it manually
Question 12 of 12 After moving a site from staging to production, which WP-CLI command updates the old domain stored in the database, including inside serialised data?
- wp search-replace 'https://staging.example.com' 'https://example.com'
- wp db query "UPDATE wp_posts SET post_content = REPLACE( post_content, 'staging.example.com', 'example.com' )"
- wp option update siteurl https://example.com on its own