Prepopulate fields across forms with previously entered values.

formidable-prepopulate-from-cookie.php

<?php
/**
 * Plugin Name: Formidable Prepopulate from Cookie
 * Plugin URI: https://www.iweb.co.uk/
 * Author: iWeb
 * Author URI: https://www.iweb.co.uk/
 * Description: Prepopulate fields across forms with previously entered values.
 * Version: 1.1.0
 * License: GPL2
 * License URI: http://www.gnu.org/licenses/gpl-2.0.html
 */

/**
 * Class Iweb_Formidable_Prepopulate_From_Cookie
 */
class Iweb_Formidable_Prepopulate_From_Cookie {

	/**
	 * Initialize the plugin by hooking into Formidable
	 */
	public function __construct() {
		add_action( 'frm_field_options_form', array( $this, 'field_options' ) );
		add_filter( 'frm_update_field_options', array( $this, 'update_field_options' ), 10, 3 );
		add_action( 'frm_after_create_entry', array( $this, 'save_values' ), 30, 2 );
		add_filter( 'frm_get_default_value', array( $this, 'prepopulate' ), 10, 2 );
	}

	/**
	 * Add cookie key field option.
	 *
	 * Add an additional option to each field. Allow the user to enter a cookie key.
	 *
	 * @param array $field
	 */
	public function field_options( $field ) { ?>

		<tr class="frm_options_heading">
			<td colspan="2">
				<div class="menu-settings">
					<h3 class="frm_no_bg">Prepopulate from Cookie</h3>
				</div>
			</td>
		</tr>
		<tr>
			<td>
				<label>Cookie Key</label>
				<span class="frm_help frm_icon_font frm_tooltip_icon" title="" data-original-title="If the user has entered a value for this key before, the field’s value will be prepopulated with the previously entered value."></span>
			</td>
			<td>
				<input type="text" name="field_options[cookie_key_<?php echo $field['id'] ?>]" value="<?php echo esc_attr( $field['cookie_key'] ); ?>" />
			</td>
		</tr>

		<?php
	}

	/**
	 * Update the field options from the admin area
	 *
	 * @param $field_options
	 * @param $field
	 * @param $values
	 *
	 * @return mixed
	 */
	public function update_field_options( $field_options, $field, $values ) {
		$field_options['cookie_key'] = isset( $values['field_options'][ 'cookie_key_' . $field->id ] ) ? sanitize_text_field( $values['field_options'][ 'cookie_key_' . $field->id ] ) : false;

		return $field_options;
	}

	/**
	 * Set a cookie to remember values for next time.
	 *
	 * Loop through each submitted field. Check each field to see if it has a cookie
	 * key. If the field has a cookie key, set a cookie to remember the value for
	 * next time.
	 *
	 * @param int $entry_id
	 * @param int $form_id
	 */
	public function save_values( $entry_id, $form_id ) {
		$cookie_keys = $this->get_cookie_keys_by_form( $form_id );

		if ( isset( $_POST['item_meta'] ) ) {
			foreach ( $_POST['item_meta'] as $field_id => $value ) {
				$field_id = intval( $field_id );

				// Skip this field if it doesn't have a cookie key.
				if ( ! array_key_exists( $field_id, $cookie_keys ) ) {
					continue;
				}

				setcookie( 'frm_prepopulate_' . $cookie_keys[ $field_id ], $value, time() + apply_filters( 'iweb_frm_prepopulate_cookie_expire', WEEK_IN_SECONDS ), COOKIEPATH, COOKIE_DOMAIN, false, true );
			}
		}
	}

	/**
	 * Prepopulate field from cookie.
	 *
	 * @param $new_value
	 * @param $field
	 *
	 * @return mixed
	 */
	public function prepopulate( $new_value, $field ) {

		// Bail if we don't have a cookie key for this field.
		if ( ! isset( $field->field_options['cookie_key'] ) || empty( $field->field_options['cookie_key'] ) ) {
			return $new_value;
		}

		$new_value = isset( $_COOKIE[ 'frm_prepopulate_' . $field->field_options['cookie_key'] ] ) ? $_COOKIE[ 'frm_prepopulate_' . $field->field_options['cookie_key'] ] : $new_value;

		return $new_value;
	}

	/**
	 * Get cookie keys by form.
	 * 
	 * @param int $form_id
	 *
	 * @return array
	 */
	public function get_cookie_keys_by_form( $form_id ) {
		global $wpdb;

		$cookie_keys = array();

		$sql    = "SELECT id, field_options FROM {$wpdb->prefix}frm_fields WHERE form_id = %d";
		$sql    = $wpdb->prepare( $sql, $form_id );
		$fields = $wpdb->get_results( $sql );

		if ( ! empty( $fields ) ) {
			foreach ( $fields as $field ) {
				$field_options = maybe_unserialize( $field->field_options );

				if ( isset( $field_options['cookie_key'] ) && ! empty( $field_options['cookie_key'] ) ) {
					$cookie_keys[ $field->id ] = $field_options['cookie_key'];
				}
			}
		}

		return $cookie_keys;
	}
}
new Iweb_Formidable_Prepopulate_From_Cookie();