Unique sequential reservation code

One solution among others :

In a plugin, you create an option on it’s activation in order to store your sequence number :

/*
Plugin Name: Reservation Increment
Description: test
*/


/**
*
* Name : myplugin_activate
* Description : Activation function
*
* @params
* @return 
*
**/

function myplugin_activate() {
    update_option('reservation_increment',3000);
}
register_activation_hook( __FILE__, 'myplugin_activate' );

Now you have to update that value and associate it with your new CPT when you create a new reservation :

/**
*
* Name : update_reservation_sequence
* Description : Updates the reservation unique incremential number
*
* @params
* @return 
*
**/
function update_reservation_sequence ($post_id, $post, $update){

    $slug = 'reservation_cpt';

    // If this isn't a 'reservation_cpt' post, don't update it.
    if ( $slug != $post->post_type  || $update) {
        return;
    }

    $increment = get_option('reservation_increment') +1;

    if ( ! add_post_meta( $post_id, 'reservation', $increment, true ) ) { 
       update_post_meta ( $post_id, 'reservation', $increment );
    }

    update_option('reservation_increment',$increment);

    return;
}

add_action( 'save_post', 'update_reservation_sequence',10,3 );

And then, to access it in your single-reservation.php template :

echo "<p>Reservation number : ".get_post_meta( get_the_ID(), 'reservation', true )."</p>";

Hope this will help !

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