pmpro-change-level-enddate-on-approval.php

<?php
/**
 * Change the end date of a membership level when a user is approved.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function pmpro_change_level_enddate_on_approval( $user_id, $level_id ) {
	global $current_user;

	$level = pmpro_getSpecificMembershipLevelForUser( $user_id, $level_id );

	// bail if startdate or enddate in the level object is empty or is recurring level.
	if ( empty( $level->startdate ) || empty( $level->enddate ) || ! empty( $level->cycle_number ) || ! empty( $level->cycle_period ) ) {
		return;
	}

	// Get the start and end date from the level.
	$startdate = intval( $level->startdate );
	$enddate   = intval( $level->enddate );

	// how many days passed since start date to today
	$days_passed = strtotime( 'now' ) - $startdate;
	$days_passed = floor( $days_passed / ( 60 * 60 * 24 ) );

	// extend the end date by the number of days passed
	$new_end_date   = date( 'Y-m-d H:i:s', strtotime( "+$days_passed days", $enddate ) );
	$new_start_date = date( 'Y-m-d H:i:s', $startdate );

	// Prepare the level array for pmpro_changeMembershipLevel. This is used for a SQL entry so the dates need to be in SQL date format.
	$level_array = array(
		'user_id'         => $user_id,
		'membership_id'   => $level_id,
		'code_id'         => $level->code_id,
		'initial_payment' => $level->initial_payment,
		'billing_amount'  => $level->billing_amount,
		'cycle_number'    => $level->cycle_number,
		'cycle_period'    => $level->cycle_period,
		'billing_limit'   => $level->billing_limit,
		'trial_amount'    => $level->trial_amount,
		'trial_limit'     => $level->trial_limit,
		'startdate'       => $new_start_date,
		'enddate'         => $new_end_date,
	);

	// Skip if we don't have correct dates for the level update.
	if ( empty( $level_array['startdate'] ) || empty( $level_array['enddate'] ) || ! strtotime( $level_array['startdate'] ) || ! strtotime( $level_array['enddate'] ) || strtotime( $level_array['enddate'] ) < strtotime( $level->enddate ) ) {
		return;
	}

	$changed = pmpro_changeMembershipLevel( $level_array, $user_id );

	// If the change was successful, update the approval meta.
	if ( $changed ) {
		// Automatically approve the user.
		update_user_meta(
			$user_id,
			'pmpro_approval_' . $level_id,
			array(
				'status'    => 'approved',
				'timestamp' => current_time( 'timestamp' ),
				'who'       => $current_user->ID, // change this to admin ID
				'approver'  => $current_user->login, // change this name.
			)
		);
	}

}
add_action( 'pmpro_approvals_after_approve_member', 'pmpro_change_level_enddate_on_approval', 10, 2 );