Load custom cancellation page for certain membership levels

gh-custom-cancel-page

<?php

/**
 * Filter handler for `pmpro_pages_shortcode_cancel` (load custom cancellation page for certain membeship levels)
 *
 * @param string $content
 *
 * @return string
 */
function gc_custom_cancel_page( $content ) {
	
	$standard_cancellation_ids = array( 5, ); // Petrolhead level ID
	$custom_cancellation_page = 1027; // Using the 'Collectors Cancellation' page ID as the custom page
	
	if ( isset( $_REQUEST['levelstocancel'] ) && $_REQUEST['levelstocancel'] !== 'all' ) {
		
		//convert spaces back to +
		$_REQUEST['levelstocancel'] = str_replace( array( ' ', '%20' ), '+', $_REQUEST['levelstocancel'] );
		
		//get the ids
		$old_level_ids = array_map( 'intval',
			explode( "+",
				preg_replace( "/[^0-9al\+]/", "", $_REQUEST['levelstocancel'] )
			)
		);
	} else if ( isset( $_REQUEST['levelstocancel'] ) && $_REQUEST['levelstocancel'] == 'all' ) {
		
		$all_levels = pmpro_getAllLevels( true, true );
		$old_level_ids = array_keys( $all_levels );
	} else {
		$old_level_ids = false;
	}
	
	if ( false === $old_level_ids ) {
		return $content;
	}
	
	// Iterate through the levels to cancel and load the custom page if applicable
	foreach( $old_level_ids as $old_level_id ) {
		
		// Do we load the custom cancellation page template?
		if ( ! in_array( $old_level_id, $standard_cancellation_ids ) ) {
			
			// Load the 'Collectors Cancellation' custom page (Page/Post ID: 1027)
			$cancellation_page = get_post( $custom_cancellation_page );
			$content = apply_filters( 'the_content', $cancellation_page->post_content );
			break; // Exit the loop
		}
	}
	
	return $content;
}

add_filter( 'pmpro_pages_shortcode_cancel', 'gc_custom_cancel_page', 20, 1 );