Used to output additional HTML within the hidden <div id="acf-form-data"> element.

This element is output within each form, and includes hidden inputs used to process the form data.


do_action( 'acf/form_data', $data );
  • $data (array) The current form data including “screen”, “post_id” and “nonce”.


  • Added in version 5.0.0


This example demonstrates how to output a hidden input, and then later perform an action depending on that value.


add_action('acf/input/form_data', 'my_acf_input_form_data');
function my_acf_input_form_data( $data ) {
    echo '<input type="hidden" name="_my_hidden_input" value="123" />';

add_action('acf/save_post', 'my_acf_save_post');
function my_acf_save_post( $post_id ) {
    if( isset($_POST['_my_hidden_input']) ) {
        // Do something.

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