If you want to execute a WordPress hook before a file iterator has loaded all files, you can use the pre_get_posts action hook to modify the query parameters before the query is executed.

Here’s an example:

phpCopy codeadd_action( 'pre_get_posts', 'my_custom_query' );

function my_custom_query( $query ) {
    // Check if the query is for a file attachment
    if ( $query->is_attachment() ) {
        // Modify the query to only retrieve images
        $query->set( 'post_mime_type', 'image' );

In this example, the pre_get_posts hook is used to modify the query parameters for file attachments, specifically to only retrieve images. You can modify this code to fit your specific use case.

Note that the pre_get_posts hook will modify the query parameters for all queries on the page, so you may need to add additional checks to ensure that the hook only executes for the specific query you want to modify.

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