Hooks: Filters

9 thoughts on “Hooks: Filters”

1. Besir

   December 22, 2023

   Hi Rodolfo,
   I wonder why you mentioned that it is “not easy” to find filter hooks vs do_action() ?

   Filter hooks use apply_filter() which should be also easy to find , right ? or maybe there methods to apply filter other than using the apply_filter() ?

   Reply
   1. Rodolfo Melogli

      January 8, 2024

      Thanks for your comment Besir!

      It’s not easy to “find” filter hooks (they use the apply_filters() function) because there are millions of them + there are no “visual hook guides” – like mine – for action hooks.

      Also, filters operate in the backend but very rarely in the frontend, so it’s more complex. At the same time, nothing stops you from doing a file search for “apply_filters”!

      Reply
2. business

   January 8, 2020

   In the project specs you mention edit add to cart button label. I can’t find a filter that hooks into the label. Can you show me where it is located?

   I’m enjoying the course and I want to learn as much as I can.

   Reply
   1. Rodolfo Melogli

      January 9, 2020

      Hello! I did a quick search through the files and found the “woocommerce_product_add_to_cart_text” filter:

      apply_filters( 'woocommerce_product_add_to_cart_text', $text, $this );
      

      You can try to use that one to “filter” i.e. edit the add to cart labels. Let me know!

      Reply
3. Noëlle

   July 30, 2019

   Hey Rodolfo, I felt inspired to try write my very first own PHP snippet. And it’s working!!! 🙂 I am so excited. But I’ll be even more excited if you could tell me whether I did it right.

   I wanted to change the sale badge text. Here’s what I wrote:

   // Change sale badge text
   add_filter( 'woocommerce_sale_flash', 'edit_sale_badge_text' );
   function edit_sale_badge_text( $val ) { 
   	$val = '<span class="onsale">' . esc_html__( 'Buy me!', 'woocommerce' ) . '</span>'; 
   	return $val; 
   }

   What do you think? And please do give it to me straight – I want to learn to do this right from the get go.

   Reply
   1. Rodolfo Melogli

      July 31, 2019

      Noelle, that’s indeed perfect. Well done 🙂

      If your site is only in English you don’t really need the esc_html__() bit, so you could simplify it if you wanted. Also, you’re giving back just one variable, and you’re not manipulating the original one (i.e. you’re overwriting it completely), so you could even skip the $val declaration:

      add_filter( 'woocommerce_sale_flash', 'edit_sale_badge_text' );
      
      function edit_sale_badge_text() { 
         return '<span class="onsale">Buy me!</span>'; 
      }
      

      Reply
      1. Noëlle

         August 8, 2019

         Wonderful! Thank you for the feedback.

         Reply
4. Shessvy

   July 18, 2019

   Did it worked, it looked like in your video the code did not work, I am going to try it and post, but I just wanted to say it might be a better display if we see the code working, the video seems to show the same snapshot of when the checkbox was there, just asking,

   Reply
   1. Rodolfo Melogli

      July 18, 2019

      Ah! You’re totally right Shessvy, in the second screenshot the checkbox is still there – that’s just a video editing mistake. I can guarantee the snippet works 🙂

      I copy the snippet here so that you can test it. Actually now that you’re there, I’m going to teach you a quicker way of working with filters when you need to return just true or false:

      add_filter( 'woocommerce_checkout_show_terms', '__return_false' );
      

      Let me know 🙂

      Reply