Reply To: $_POST in new post title the first 3 characters of a field value

• Beee

• February 2, 2018 at 5:51 am

Maybe I’m missing it, but how can this function work ????

You change override/change $_POST but you don’t do anything with this var.

You only return the $post_id again.

For one of my sites I create post titles, based on an ACF field. It’s not exactly what you want, but it gives a good idea I think. See below:

function set_title_from_acf( $post_id ) {

    // bail if no ACF data
    if ( empty( $_POST[ 'acf' ] ) ) {
        return;
    }

    $ad_title = 'field_57e3ed6c92ea0'; // input field
    // if sd_ad_title is entered
    if ( ! empty( $_POST[ 'acf' ][ $ad_title ] ) ) {

        $post          = get_post( $post_id );
        $entered_title = $_POST[ 'acf' ][ $ad_title ];
        $cleaned_title = preg_replace( '/[^A-Za-z0-9\-\s]/', '', $entered_title ); 
        // Removes special chars.
        $post_name     = sanitize_title( $cleaned_title );
        update_field( 'sd_ad_title', $cleaned_title, $post_id ); // update acf field

        // update post slug + post title (if needed)
        global $wpdb;
        $wpdb->update(
            $wpdb->posts,
            array(
                'post_title'  => $cleaned_title,
                'post_name'   => $post_name
            ),
            array(
                'ID' => $post_id
            )
        );

        clean_post_cache( $post_id );

    }

}
add_action( 'acf/save_post', 'set_title_from_acf', 20 );

-=-

To get the first 3 characters from a certain field, substr is def. the way to go in my opinion.

$new_value = substr( $_POST['acf']['field_5a6b343038f0c'], 0, 3 );