: str_replace(): Passing null to parameter #2 ($replace) of type array|string is deprecated in
final class NF_Database_SubmissionExpirationCron
* NF_Database_SubmissionExpirationCron constructor.
* Sets up our our submission expiration CRON job.
public function __construct()
// Retrieves the option that contains all of our expiration data.
$options = get_option( 'nf_sub_expiration', false );
// Schedules our CRON job.
if( ! wp_next_scheduled( 'nf_submission_expiration_cron' ) && ! empty( $options ) ) {
wp_schedule_event( time(), 'daily', 'nf_submission_expiration_cron' );
add_action( 'nf_submission_expiration_cron', array( $this, 'expired_submission_cron' ) );
* Expired Submission Cron
* Checks our subs to see if any are expired and sends them to be
* deleted if there are any that need to be removed.
public function expired_submission_cron()
$options = get_option( 'nf_sub_expiration', false );
// If options are empty bail..
if( ! $options || ! is_array( $options ) ) return;
// Loop over our options and ...
foreach( $options as $option ) {
* Separate our $option values into two positions
* $option[ 0 ] = ( int ) form_id
* $option[ 1 ] = ( int ) expiration time in days.
$option = explode( ',', $option );
// Use the helper method to build an array of expired subs.
$expired_subs[] = $this->get_expired_subs( $option[ 0 ], $option[ 1 ] );
// If the expired subs array is empty bail.
if( empty( $expired_subs ) ) return;
// Call the helper method that deletes the expired subs.
$this->delete_expired_subs( $expired_subs );
* Gathers our expired subs puts them into an array and returns it.
* @param $form_id - ( int ) ID of the Form.
* @param $expiration_time - ( int ) number of days the submissions
* @return array of all the expired subs that were found.
public function get_expired_subs( $form_id, $expiration_time )
// Create the that will house our expired subs.
// Create our deletion timestamp.
$deletion_timestamp = time() - ( 24 * 60 * 60 * $expiration_time );
// Get our subs and loop over them.
$sub = Ninja_Forms()->form( $form_id )->get_subs();
foreach( $sub as $sub_model ) {
// Get the sub date and change it to a UNIX time stamp.
$sub_timestamp = strtotime( $sub_model->get_sub_date( 'Y-m-d') );
// Compare our timestamps and any expired subs to the array.
if( $sub_timestamp <= $deletion_timestamp ) {
$expired_subs[] = $sub_model->get_id();
* Helper method that removes our expired subs.
* @param $expired_subs - array of sub ids that need to be deleted.
* @param $cap - The cap of the amount of subs you want deleted at 1 time.
public function delete_expired_subs( $expired_subs )
foreach( $expired_subs as $subs ) {
foreach( $subs as $sub ) {