Add approval status to members list of Paid Memberships Pro

pmpro-approvals-added-to-members-list.php

<?php
/**
 * Adds approval status column to the members list.
 *
 * @param [type] $columns
 * @return void
 */
function my_pmpro_add_memberslist_col_approval( $columns ) {
	$columns['approval'] = 'Approval Status';
	return $columns;
}
add_filter( 'pmpro_manage_memberslist_columns', 'my_pmpro_add_memberslist_col_approval' );

/**
 * Fills the "Approval" column of the Members List.
 *
 * @param  string $colname column being filled.
 * @param  string $user_id to get information for.
 */
function my_pmpro_fill_memberslist_col_approval( $colname, $user_id ) {
    $level = pmpro_getMembershipLevelForUser( $user_id );
	if ( 'approval' === $colname ) {
        $approval_status = PMPro_Approvals::getUserApprovalStatus( $user_id, $level->id );
        
        if ( $approval_status !== NULL ) {
            echo ucfirst( $approval_status );
        } else {
            // Already existed before Approvals Add On (You can echo out any message here.)
        }
        
	}
}
add_filter( 'pmpro_manage_memberslist_custom_column', 'my_pmpro_fill_memberslist_col_approval', 10, 2 );