What is WordPress Hook: pre_link_rel
The pre_link_rel hook in WordPress is used to modify the rel attribute value of the link tag before it is printed to the page. This hook allows developers to change or add additional values to the rel attribute of the link tag.
Understanding the Hook: pre_link_rel
The pre_link_rel hook is located within the wp_rel_link() function in the WordPress core. This function is responsible for generating the rel attribute value for the link tag. The pre_link_rel hook is called just before the rel attribute value is printed to the page, giving developers the opportunity to modify it.
Hook Parameters (if applicable): pre_link_rel
The pre_link_rel hook does not accept any parameters. It simply allows developers to modify the rel attribute value of the link tag before it is outputted.
Hook Doesn’t Work: pre_link_rel
If the pre_link_rel hook doesn’t seem to be working, it could be due to the hook not being properly added to the theme or plugin files. Double-check that the hook is being added correctly and that the function to modify the rel attribute value is properly defined.
Best Practices & Usage Notes (if applicable): pre_link_rel
When using the pre_link_rel hook, it’s important to keep in mind that any modifications made to the rel attribute value should be relevant to the link being outputted. It’s best practice to only modify the rel attribute if there is a specific need to do so, such as adding a custom value for SEO purposes.
pre_link_rel Usage Example: pre_link_rel
“`php
function custom_pre_link_rel($rel, $link) {
// Add ‘nofollow’ to the rel attribute value
$rel .= ‘ nofollow’;
return $rel;
}
add_filter(‘pre_link_rel’, ‘custom_pre_link_rel’, 10, 2);
“`
In this example, the pre_link_rel hook is used to add the ‘nofollow’ value to the rel attribute of the link tag before it is printed to the page. This can be useful for adding a ‘nofollow’ attribute to certain links for SEO purposes.
