为什么add_filter（）被应用两次？

Question

function replace_text_wps($text){
        $replace = array(
            // 'WORD TO REPLACE' => 'REPLACE WORD WITH THIS'
            'wordpress' => '<a href="#">wordpress</a>',
            'excerpt' => '<a href="#">excerpt</a>',
            'function' => '<a href="#">function</a>'
        );
        $text = str_replace(array_keys($replace),
    $replace, $text);
        return $text; }

    add_filter('the_content','replace_text_wps');
    add_filter('the_excerpt','replace_text_wps');

This code is used to replace some words, why is he using add_filter() function twice, is he wrong?

Also, what does the line $text = str_replace(array_keys($replace), $replace, $text) mean?

Answer 1

$text = str_replace(array_keys($replace), $replace, $text);

Replaces all given keys with $replace in $text string

this code is just filtering two different strings.