Example of how to change the Ticket Selector QTY field based on a custom field set on the event

example.php

<?php //Please do not include the opening PHP tag if you already have one.

//Another example that uses a custom field within the event.
//Set ee_purchase_tickets to true within your event to display 'Purchase Tickets'
//If no value has been set default to the standard button text (Register Now).
function tw_ee_custom_filter_ticket_selector_qty_text( $qty_text, $event_id ) {
    $ee_custom_qty_text = get_post_meta( $event_id, 'ee_custom_qty_text', true );

    if ( $ee_custom_qty_text ) {
      return $ee_custom_qty_text;
    }

    return $qty_text;
}
add_filter( 'FHEE__ticket_selector_chart_template__table_header_qty', 'tw_ee_custom_filter_ticket_selector_qty_text', 10, 2 );