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Does anyone know how to add autosave feature for advanced custom fields or add acf to the autosave event. I searched about it but I didn't find any solution.

thank you

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Take a look at these lines to have an idea about adding the autosave feature:

function hcf_save( $post_id ) {
    if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
        return;
    }
    if ( $parent_id = wp_is_post_revision( $post_id ) ) {
        $post_id = $parent_id;
    }
    $field_list = [
        'hcf_author',
        'hcf_published_date',
        'hcf_price',
    ];
    foreach ( $field_list as $fieldName ) {
        if ( array_key_exists( $fieldName, $_POST ) ) {
            update_post_meta(
                $post_id,
                $fieldName,
                sanitize_text_field( $_POST[ $fieldName ] )
            );
        }
    }
}
add_action( 'save_post', 'hcf_save' );

You can find more information about the autosave feature right here.

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