Creates a dynamic tag for using in MemberPress custom fields.

memberpress-custom-field-dynamic-tag.php

<?php

add_filter( 'mepr_fetch_options', 'mp_filter_custom_fields' );
/**
 * Filter the MemberPress options to set a dynamic value for custom fields.
 *
 * @param  object 	$options 	MeprOptions
 *
 * @return object         		MeprOptions
 */
function mp_filter_custom_fields( $options ) {

	// Make sure we have custom registration fields
	if ( empty( $options->custom_fields ) ) {
		return $options;
	}

	foreach ( $options->custom_fields as $key => $field ) {
		// Replace the dynamic "%%date%%" date tag with the current date
		if ( '%%date%%' === $field->default_value ) {
			$options->custom_fields[$key]->default_value = date( 'Y-m-d' );
		}
	}

	return $options;
}