<?php

class JEC_Repeater_Format_Number {
	public function __construct() {
		add_filter(
			'jet-engine/listings/filters-list',
			array( $this, 'add_callback' )
		);
	}
	
	public function add_callback( $callbacks ) {
		$callbacks['format_number'] = array(
			'cb'   => array( $this, 'callback' ),
			'args' => '',
		);
		return $callbacks;
	}
	
	public function callback( $value, $arg = 0 ) {
		$value = floatval( $value );
		$arg = intval( $arg );
		return number_format( $value, $arg );
	}
}

new JEC_Repeater_Format_Number();