Filter hooks in Wordpress - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a filter hook that modifies the content.

Wordpress

<?php
add_filter('the_content', [1]);
function modify_content($content) {
    return $content . ' - Modified';
}
?>

Drag options to blanks, or click blank then click option'

A'change_content'

B'content_filter'

C'filter_content'

D'modify_content'

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the function name without quotes.

Using a function name that does not exist.

The function name 'modify_content' must be passed as a string to add_filter to hook it properly.

2fill in blank

medium

Complete the code to apply the filter and get the modified content.

Wordpress

<?php
$content = 'Hello World';
$modified = apply_filters('the_content', [1]);
echo $modified;
?>

Drag options to blanks, or click blank then click option'

A$content

B'content'

C'Hello World'

D$modified

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a string literal instead of the variable.

Passing the output variable instead of the input.

apply_filters needs the original content variable to pass through the filter hooks.

3fill in blank

hard

Fix the error in the filter hook registration by completing the code.

Wordpress

<?php
add_filter('the_title', [1]);
function change_title($title) {
    return strtoupper($title);
}
?>

Drag options to blanks, or click blank then click option'

A'change_title'

Bchange_title()

Cchange_title

D'changeTitle'

Attempts:

3 left

💡 Hint

Common Mistakes

Including parentheses after the function name.

Passing the function name without quotes.

The function name must be passed as a string without parentheses to add_filter.

4fill in blank

hard

Fill both blanks to create a filter hook that adds a suffix to the excerpt.

Wordpress

<?php
add_filter([1], [2]);
function add_suffix($excerpt) {
    return $excerpt . '... Read more';
}
?>

Drag options to blanks, or click blank then click option'

A'the_excerpt'

B'add_suffix'

C'excerpt_suffix'

D'suffix_function'

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up filter tag and function name.

Using incorrect filter tag names.

The filter name is 'the_excerpt' and the function hooked is 'add_suffix'.

5fill in blank

hard

Fill all three blanks to create a filter hook that changes the author name to uppercase.

Wordpress

<?php
add_filter([1], [2]);
function [3]($author) {
    return strtoupper($author);
}
?>

Drag options to blanks, or click blank then click option'

A'the_author'

B'uppercase_author'

Cuppercase_author

Attempts:

3 left

💡 Hint

Common Mistakes

Not matching the function name in all places.

Passing function name without quotes in add_filter.

The filter tag is 'the_author', the function name is 'uppercase_author' passed as string, and the function is named uppercase_author.