[Solved] Why does this code produce an error?add_filter('the_excerpt', 'modify_excerpt');function modify_excerpt($excerpt) { return strtolower($excerpt);}echo apply_filters('the_excerpt'); | Wordpress

Wordpress - WordPress Hooks System

Why does this code produce an error?

add_filter('the_excerpt', 'modify_excerpt');
function modify_excerpt($excerpt) {
  return strtolower($excerpt);
}
echo apply_filters('the_excerpt');

Aapply_filters is called without the required second argument

BThe function 'modify_excerpt' is not defined

Cadd_filter cannot be used with 'the_excerpt'

DThe callback function must echo, not return a value

Step-by-Step Solution

Solution:

Step 1: Check apply_filters usage
apply_filters requires the value to filter as the second argument.
Step 2: Identify missing argument
Here, apply_filters('the_excerpt') lacks the value to filter.
Final Answer:
apply_filters is called without the required second argument -> Option A
Quick Check:
apply_filters needs a value argument [OK]

Quick Trick: apply_filters must have a value argument [OK]

Common Mistakes:

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Why does this code produce an error?