mypmpro-approval-all-users-bulk.php

<?php //do not copy

/**
 * This recipe will bulk approve users that may have signed up before the Add On was installed. 
 *
 * Use /wp-admin/?approvemembers=true to run the script. 
 * 
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function mypmpro_approve_all_existing_members_once(){

	if( isset( $_REQUEST['approvemembers'] ) ) {

		if ( ! class_exists( 'PMPro_Approvals' ) ) {
			return;
		}

		$users = get_users();

		if( ! $users ) {
			return;
		}

		foreach( $users as $user ) {

			$user_id = $user->ID;

			$users_level = pmpro_getMembershipLevelForUser( $user_id );
			
			if( empty( $users_level ) ) {
				continue;
			}
			
			//doesn't require approval, do nothing
			if ( ! PMPro_Approvals::requiresApproval( $users_level->id ) ) {
				echo "Did not need to approve user ".$user_id."<br/>";
			} else {
				//approve them
				PMPro_Approvals::ApproveMember( $user_id, $users_level->id );
				
				echo "Approving user ".$user_id." for level ".$users_level->id."<br/>";
			}

		}

		exit();

	}

}
add_action( 'admin_init', 'mypmpro_approve_all_existing_members_once' );