function replace_text_wps($text){

    $replace = array(

        // '替换前的内容' => '替换后的内容'

        '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_content', 'replace_text_wps');