WordPress adds links to the specified keywords in the content of the article

function replace_text_wps($text){
$replace = array(
'Theme King' => '<a href="https://yijile.com/tag/wordpress/" rel="tag" >Theme King</a>',
'WordPresstheme' => '<a href="https://wpfans.org/theme" rel="category tag" >WordPresstheme</a>',
'WrodPresscourse' => '<a href="https://wpfans.org/wplearn" rel="nofollow" target="_blank" >WrodPresscourse</a>'
);
$text = str_replace(array_keys($replace), $replace, $text);
return $text;
}

add_filter('the_content', 'replace_text_wps');

usage method

Paste the following code into your own WordPress theme functions.php File.