How to use image_edit_before_change filter in WordPress

image_edit_before_change filter

Filters the GD image resource before applying changes to the image.

To use the image_edit_before_change filter, first you have to register it using add_filter. You can write this code into functions.php of your activated theme or in a custom WordPress Plugin.

We at WePlugins always prefer to create a custom WordPress Plugin while using hooks so nothing breaks when you update your WordPress Theme in the future.

In the below live example, we have defined a function weplugins_modify_image_edit_before_change_defaults which takes 2 parameters and we registered using add_filter. The first parameter image_edit_before_change is the name of the hook, the second parameter weplugins_modify_image_edit_before_change_defaults is the name of the function which needs to be called, the third parameter is the priority of calling the hook if the same hook is used multiple times, and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometimes, you have to remove a registered hook so you can use remove_filter to remove the image_edit_before_change filter.

Parameters

Below are the 2 parameters required to use this hook.

• $image : (resource|GdImage) GD image resource or GdImage instance.
• $changes : (array) Array of change operations.

Live Example 1

Below is an example of how you can use this hook.

    function weplugins_modify_image_edit_before_change_defaults($image, $changes) { 
        // Update the $image variable according to your website requirements and return this variable. You can modify the $image variable conditionally too if you want.
        return $image; 
    }
    // add the filter
    add_filter("image_edit_before_change", "weplugins_modify_image_edit_before_change_defaults", 10, 2);
    

Live Example 2

To remove a hook callback, use the example below.

    remove_filter("image_edit_before_change", "weplugins_modify_image_edit_before_change_defaults", 10, 2);
    

Please make sure to provide the same callback function name, priority, and number of arguments while removing the hook callback.

Live Example 3

Another way to use this hook with a different priority.

    function weplugins_another_modify_image_edit_before_change($image, $changes) { 
        // Custom modifications to the $image variable
        return $image; 
    }
    // add the filter with different priority
    add_filter("image_edit_before_change", "weplugins_another_modify_image_edit_before_change", 20, 2);
    

Contact Us

If you’re having any trouble using this hook, please contact our WordPress Development Team and we’d be happy to assist you.