WPJM alerts reschedule alert cron jobs

.php

if ( ! has_action('job-manager-alert-check-reschedule') ) {
	function wpjm_alerts_check_reschedule_events() {
		$alert_posts = new WP_Query( array(
			'post_type' => 'job_alert',
			'posts_per_page' => -1,
			'post_status' => 'publish'
		) );
		$schedules = WP_Job_Manager_Alerts_Notifier::get_alert_schedules();
		foreach ( $alert_posts->posts as $post ) {
			if ( false === wp_next_scheduled( 'job-manager-alert', array( $post->ID ) ) ) {$alert_frequency = get_post_meta( $post->ID, 'alert_frequency', true );
				$next = strtotime( '+1 day' );
				if ( ! empty( $schedules[ $alert_frequency ] ) ) {
					$next = strtotime( '+' . $schedules[ $alert_frequency ]['interval'] . ' seconds' );
				}
				wp_schedule_event( $next, $alert_frequency, 'job-manager-alert', array( $post->ID ) );
			}
		}
	}
	add_action( 'job-manager-alert-check-reschedule', 'wpjm_alerts_check_reschedule_events' );
	if ( false === wp_next_scheduled( 'job-manager-alert-check-reschedule' ) ) {
		wp_schedule_event( time(), 'daily', 'job-manager-alert-check-reschedule' );
	}
}