CODEWITHSUNDEEP
phpwordpress
David
David

Reputation: 21

What does apply_filters do?

I have a scenario like this , since its a big code, I'm asking this in an easy way:

In a file called One.php, I have something like this:

add_filter('eshopaddtocheckout','eshop_extras_checkout');

function eshop_extras_checkout($echo){
    //blah blah..   
}

In a file, Two.php, I have something like this:

$echo = apply_filters('eshopaddtocheckout',$echo);

My doubts are:

  1. I don't understood how Two.php made a connection with the One.php file? I didnt even find a line using something like include One.php inside the Two.php file (BUT the functionality is working perfectly between the 2 files)

  2. what does apply_filters do?

Upvotes: 2

Views: 8615

Answers (3)

Lexiriam
Lexiriam

Reputation: 75

As stated before, there is no PHP function called apply_filters nor do_action. These are Wordpress event driven hooks; specifically made for extensions.

For a better understanding, please refer to: https://wpshout.com/apply_filters-do_action/

Hope this helps.

Upvotes: 0

molnarm
molnarm

Reputation: 10031

You can register filters with WordPress, passing a name and a function to add_filter. These can contain actions you want to perform on some data before it is used. apply_filters calls these with arguments, $echo in your example.

See the WordPress documentation on filters for more details.

Upvotes: 0

Jules
Jules

Reputation: 15199

There is no php function apply_filters. It must be defined by some additional software you are using; perhaps wordpress? If so, there's an answer here that may help: What does apply_filters(...) actually do in WordPress?

Upvotes: 7

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