get_image_tag_class filter

Filters the value of the attachment’s image tag class attribute.

To use get_image_tag_class 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 Flipper Code, 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 modify_get_image_tag_class_defaults which takes 4 parameters and we registered using add_filter. The first parameter get_image_tag_class is name of the hook, The second parameter modify_get_image_tag_class_defaults is name of the function which need to be called, third parameter is the priority of calling the hook if same hook is used multiple times and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometime, you have to remove a registered hook so you can use remove_filter to remove get_image_tag_class filter.


    Below are the 4 parameters are required to use this hook.

  • $class : (string) CSS class name or space-separated list of classes.
  • $id : (int) Attachment ID.
  • $align : (string) Part of the class name for aligning the image.
  • $size : (string|int[]) Requested image size. Can be any registered image size name, or an array of width and height values in pixels (in that order).

Live Example

function example_add_img_class( $class ) {
         return $class . ' img-fluid';
 add_filter( 'get_image_tag_class', 'example_add_img_class' );

Below is an example how you can use this hook.

                        function modify_get_image_tag_class_defaults($class, $id, $align, $size) { 
                            // Update the $class variable according to your website requirements and return this variable. You can modify the $class variable conditionally too if you want.

                            return $class; 
                        // add the filter
                        add_filter( "get_image_tag_class", "modify_get_image_tag_class_defaults", 10, 4 );

To remove a hook callback, use the example below.

remove_filter( "get_image_tag_class", "modify_get_image_tag_class_defaults", 10, 4 );

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

Flipper Code is a Premium WordPress Plugins development company and integrating new functionalites into WordPress sites in form of custom WordPress Plugins since 2012. If you’re having any trouble using this hook, please contact our WordPress Development Team and we’d be happy to assist you.


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