Function and usage of image_attachment_fields_to_save() in wordpress


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    The image_attachment_fields_to_save function in WordPress is a filter used primarily in the context of handling media uploads. This function allows you to modify or augment the data being saved for an image attachment. Here's a detailed breakdown of its usage:

    Function Signature

    image_attachment_fields_to_save( array $post, array $attachment ): array

    Function Description

    • Purpose: This function is employed to filter and process the input received from the media_upload_form_handler(). It's particularly useful when you need to ensure specific data integrity or defaults for image attachments being uploaded in WordPress.
    • Behavior: It can be used, for instance, to automatically assign a default post_title for the attachment from the file name if no title is explicitly supplied by the user.


    1. $post (array, required): This is an array representation of the WP_Post object associated with the attachment. It contains various details about the post, such as post_title, post_content, post_status, etc.

    2. $attachment (array, required): This array holds the metadata related to the attachment. It includes information like the file's URL, dimensions for images, file type, and any other metadata that WordPress or plugins might add to an attachment.

    Return Value

    • Return Type: array
    • Description: The function returns an array which is the modified version of the $post array. This array should reflect any changes or additions you've made to the attachment's details.

    Sample Usage

    function my_custom_attachment_fields_to_save($post, $attachment) {
        // Check if post_title is empty and set a default title from the file name
        if (empty($post['post_title'])) {
            $post['post_title'] = basename($attachment['file']);
        // You can also modify other metadata or add custom logic here
        return $post;
    add_filter('attachment_fields_to_save', 'my_custom_attachment_fields_to_save', 10, 2);

    In this example, the function my_custom_attachment_fields_to_save checks if the post_title of the attachment is empty. If it is, it sets the post_title to the file name (extracted from the attachment metadata). This function is hooked to the attachment_fields_to_save filter, ensuring that it's called whenever WordPress processes attachment data for saving.

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