Capture a submitted ACF form with fields, and do not create a post out of the data

capture-acf-form-save-post.php

<?php

// Adds a new hook that catches a submitted acf_form by field group key. Only supports a single field group, but could be expanded.
// Just use the new action:
// capture-acf-form/field_group=%%%%%%%%%%%
// Replace %%%%%%% with your field group key.


/**
 * Capture user registration form for processing.
 *
 * @param $fields
 * @param $field_group
 * @param $acf_form
 *
 * @internal param $post_id
 */
function custom_user_registration_submit( $fields, $field_group, $acf_form ) {
	var_dump($fields); // Array of fields. Keys are the field name. Values are the submitted data.
	var_dump($field_group); // Field group definition array. Includes ['fields'] array.
	var_dump($acf_form); // The acf_form() args, including things like the "return" url
	exit; // remove this after you test the above and see what the output looks like.
  
  // $fields might look like:
  /*
array(6) {
  ["first_name"]=>
  string(6) "Radley"
  ["last_name"]=>
  string(8) "Sustaire"
  ["email"]=>
  string(18) "[email protected]"
  ["additional-information"]=>
  string(5) "hello world this is some text"
  ["test_repeater"]=>
  array(2) {
    [0]=>
    array(1) {
      ["mytextfield"]=>
      string(6) "lostthegame"
    }
    [1]=>
    array(1) {
      ["mytextfield"]=>
      string(6) "asdfsf"
    }
  }
}
  */
  
  // ----------------------
  // ----------------------
  // DO STUFF HERE!
  // ----------------------
  // ----------------------
}
add_action( 'capture-acf-form/field_group=group_588ba2d0c9450', 'custom_user_registration_submit', 25, 3 );


/**
 * Save ACF form data on the page with the registration shortcode.
 * Note: This adds the acf_form_head call to any page. You only need it on pages that submit a form, though.
 */
function capture_acf_form_include_header() {
	acf_form_head();
}
add_action( 'get_header', 'capture_acf_form_include_header' );

/**
 * Hook to intercept saving acf_form's with a single field group. An action will be triggered.
 * If a hook is attached to the action, then the original post will be removed and pass all data to the hook instead.
 *
 * @param $post_id
 */
function _capture_acf_form_submission( $post_id ) {
	if ( !is_numeric($post_id) ) return; // This should only work for items created as a post.
	if ( empty($GLOBALS['acf_form']['field_groups']) ) return;
	if ( count($GLOBALS['acf_form']['field_groups']) != 1 ) return;

	$acf_form = $GLOBALS['acf_form'];
	$field_group_key = $acf_form['field_groups'][0];

	$action_name = 'capture-acf-form/field_group=' . $field_group_key;
	if ( !has_action( $action_name ) ) return;

	$field_group = _acf_get_field_group_by_key( $field_group_key );
	if ( !$field_group ) return;

	$field_group['fields'] = acf_get_fields( $field_group );
	if ( !$field_group['fields'] ) return;

	// Collect all fields into an array
	$fields = array();
	foreach( $field_group['fields'] as $k => $field ) {
		$fields[ $field['name'] ] = get_field( $field['name'], $post_id );
	}

	// Trigger our action
	do_action( $action_name, $fields, $field_group, $acf_form );

	// Should we delete the post that ACF created?
	if ( apply_filters( 'delete-acf-form-post', true ) ) {
		wp_delete_post( $post_id, true );
		unset($GLOBALS['acf_form']);
		remove_all_actions( 'acf/save_post' );
	}

	// Should we redirect the user?
	$return_url = empty($acf_form['return']) ? false : $acf_form['return'];
	$return_url = apply_filters( 'acf-form-return-url', $return_url );

	if ( $return_url ) {
		wp_redirect( $return_url );
		exit;
	}
}
add_action( 'acf/save_post', '_capture_acf_form_submission', 25 );