Additional placeholders for Woocommerce email notifications subject with ACF

Question

I'm searching a way of creating new placeholders for subject and recipients email when a new order is create? I have created new fields with ACF : "chantier" and "conducteur de travaux" called and I want to be able to add {chantier} in my subject mail and add {conducteur} to my recipient.

Here my code for ACF field :

 if( function_exists('acf_add_local_field_group') ):

 acf_add_local_field_group(array(
'key' => 'group_5c49b50b45a52',
'title' => 'Nom du chantier',
'fields' => array(
    array(
        'key' => 'field_5c49b5127665d',
        'label' => 'Chantier',
        'name' => 'chantier',
        'type' => 'post_object',
        'instructions' => '',
        'required' => 0,
        'conditional_logic' => 0,
        'wrapper' => array(
            'width' => '',
            'class' => '',
            'id' => '',
        ),
        'show_fields_options' => array(
            0 => 'order',
            1 => 'email',
        ),
        'post_type' => array(
            0 => 'chantier',
        ),
        'taxonomy' => '',
        'allow_null' => 0,
        'multiple' => 0,
        'return_format' => 'object',
        'ui' => 1,
    ),
    array(
        'key' => 'field_5c541edb71030',
        'label' => 'Conducteur de travaux',
        'name' => 'conducteur_de_travaux',
        'type' => 'user',
        'instructions' => '',
        'required' => 0,
        'conditional_logic' => 0,
        'wrapper' => array(
            'width' => '',
            'class' => '',
            'id' => '',
        ),
        'show_fields_options' => array(
            0 => 'order',
            1 => 'email',
        ),
        'role' => array(
            0 => 'conducteur-de-travaux',
        ),
        'allow_null' => 0,
        'multiple' => 0,
        'return_format' => 'array',
    ),
),
'location' => array(
    array(
        array(
            'param' => 'checkout',
            'operator' => '==',
            'value' => 'wc-before-billing-form',
        ),
    ),
),
'menu_order' => 0,
'position' => 'normal',
'style' => 'default',
'label_placement' => 'top',
'instruction_placement' => 'label',
'hide_on_screen' => '',
'active' => 1,
'description' => '',
 ));

 endif;

I have tried with this code suggested here :

Create additional variables/placeholders for Woocommerce email notifications subject

But it doesn't works, here my code :

add_filter( 'woocommerce_email_format_string' ,           'add_custom_email_format_string', 20, 2 );
function add_custom_email_format_string( $string, $email ) {
    // The post meta key used to save the value in the order post meta data
    $meta_key = '_chantier';

    // Get the instance of the WC_Order object
    $order    = $email->object;

    // Get the value
    $value  = get_field( $meta_key, $order_id );

    // Additional subject placeholder
    $new_placeholders = array( '{chantier}' => $value );

    // Return the clean replacement value string for "{chantier}" placeholder
    return str_replace( array_keys( $additional_placeholders ), array_values( $additional_placeholders ), $string );
}

When I receive the mail I have it : Order {chantier}. I don't know where is my mistake...

And for the field "conducteur-de-travaux" (user field), I would like to recover the email of the "conducteur de travaux" and add it to the new order recipient email. Is it possible?

LoicTheAztec · Answer 1 · 2020-10-20T21:27:11.817

Note: On stackOverFlow to avoid your question to be closed for "too broad" reason, always ask one small question instead of asking multiple distinct questions at once. The rule is one answer to one question.

There is some errors and mistakes in your code like $order_id that is not defined, so it can't work.

You need to be sure of the meta_key to be used to get the ACF value. It seem that it should be 'chantier' instead of '_chantier' (You can try both of them to see which one works).

The code below will ad new placeholders for email notifications subject for ACF value:

add_filter( 'woocommerce_email_format_string', 'add_custom_email_format_string', 10, 2 );
function add_custom_email_format_string( $string, $email ) {

    // HERE the ACF slug to be used to get the value
    $meta_key = 'chantier';
    
    // Get the instance of the WC_Order object
    $order   = $email->object;
    
    // Get ACF value (with the correct Order ID)
    $value = get_field( $meta_key, $order->get_id() );
    
    // Additional subject placeholder
    $new_placeholders = array( '{chantier}' => $value );
    
    // Get the clean replacement value string for "{chantier}" placeholder
    return str_replace( array_keys( $additional_placeholders ), array_values( $additional_placeholders ), $string );
}

Code goes in function.php file of your active child theme (or active theme). It should works now.

Additional placeholders for Woocommerce email notifications subject with ACF

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