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What i'm trying to do - i have meta field in post with array of user emails, i'd like to add new user email(if it's not there already) with each submission of Contact form 7.

Here's what i managed to do by now:

add_action('wpcf7_mail_sent',
    function ($contact_form) {
        if ($contact_form->id() === 32009) {
            $submission = WPCF7_Submission::get_instance();
            //$currentdata = get_post_meta(32127, 'customer_email');
            $mail = $submission->get_posted_data('email-002');
            update_post_meta(32127, 'customer_email',$mail);
        }
    }
);

Thing is that above code is replacing whole array with one new string and i just want to add it, not replace whole thing.

add_post_meta create duplicates and with unique="true" it doesn't add anything.

I would appreciate if anyone could explain to me how can i achieve what i need and maybe a little about updating meta fields, since reading wordpress documentation doesn't really answer my questions.

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  • post meta values are just strings, even if you try to store an array it gets flattened to a string. update_post_meta replaces the entire value it can't edit/append as it has no concept of "structured data" Commented Nov 7, 2023 at 16:48

1 Answer 1

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I think you're close. In my code I've assumed that the desired customer_email meta looks like this:

array(
    0 => '[email protected]',
    1 => '[email protected]',
    2 => '[email protected]',
);

What you need to do is add the new email address to the array of existing email addresses, then save the updated array back to the meta value. update_post_meta() simply overwrites whatever's already in the meta value, so you can't use it to simply merge a new value into an existing array.

Something like this should do it:

add_action('wpcf7_mail_sent',
    function ($contact_form) {
        if ($contact_form->id() === 32009) {
            $submission = WPCF7_Submission::get_instance();
            $currentdata = get_post_meta(32127, 'customer_email', true);
            if ( empty( $currentdata ) ) {
                $currentdata = array();
            }
            // Bail out if $currentdata *isn't* an array.
            if ( ! is_array( $currentdata ) ) {
                return;
            }
            $mail = $submission->get_posted_data('email-002');
            // Add the new email address to $currentdata.
            $currentdata[] = $mail;
            update_post_meta(32127, 'customer_email',$currentdata);
        }
    }
);

Edited: I've changed get_post_meta( 32127, 'customer_email' ); to get_post_meta( 32127, 'customer_email', true ); to ensure that we only get a single post_meta value. Otherwise it will grab all the post_meta values with the key customer_email.

I'm not sure that's the cause of the error you're seeing in the comments, but it should make the code more precise.

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  • 1
    can you expand a bit on what you did? The solution is in your code but it's buried a bit Commented Nov 7, 2023 at 16:49
  • with above code when trying to add duplicate i'm getting PHP error: PHP Fatal error: Uncaught TypeError: strtolower(): Argument #1 ($string) must be of type string, array given - is it that something is not sanitized properly? Commented Nov 7, 2023 at 17:46
  • I've updated the code; I'm not sure that's the fix, but it'll improve the precision. Commented Nov 7, 2023 at 18:42
  • 1
    @PatJ thanks! now it works properly. At the end of the script i have added a little check for duplicates: if (in_array($mail, $currentdata)) { return; } else { $currentdata[] = $mail; update_post_meta(32127, 'customer_email',$currentdata); } and now it's perfect, thanks again! Commented Nov 7, 2023 at 19:34

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