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

• t.gav

• January 30, 2018 at 11:01 pm

Hello,

i have the following function setup to populate a new posts title based on the values of four fields:

function acf_review_before_save_post($post_id) {
if (empty($_POST[‘acf’]))
return;
$_POST[‘acf’][‘_post_title’] = $_POST[‘acf’][‘field_5a6b343038f0c’].’ ‘.$_POST[‘acf’][‘field_5a6770a3c509d’].’ ‘.$_POST[‘acf’][‘field_5a5f76d271881′].’ ‘.$_POST[‘acf’][‘field_5a6b3459d911d’];
return $post_id;
}

I want to get only the first 3 chars of one of the fields

i have tried this substr($_POST[‘acf’][‘field_5a6b343038f0c’],1) as well as this $_POST[‘acf’][‘field_5a6b343038f0c’][0] but whenever i use one of these two methods the post creation doesn’t go through

Any suggestion on how i can just get the first 3 chars of a value in a function of this type?

PS: the function works properly otherwise

• 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 );

• t.gav

• February 6, 2018 at 2:17 am

This did the trick for me!

basically i used this to get the first 3 characters: mb_strimwidth($_POST['acf']['field_5a6b343038f0c'], 0, 3 )

Below you can see the function:

function acf_review_before_save_post($post_id) {
	if (empty($_POST['acf']))
		return;
	$_POST['acf']['_post_title'] =$_POST['acf']['field_5a6770a3c509d'].' '.mb_strimwidth($_POST['acf']['field_5a6b343038f0c'], 0, 3 ).' '.$_POST['acf']['field_5a5f76d271881'].' '.date("d/m/Y", strtotime($_POST['acf']['field_5a6b3543bf97a']));
	return $post_id;
}
add_action('acf/pre_save_post', 'acf_review_before_save_post', -1);

Thanks for your response!

• Beee

• February 6, 2018 at 2:21 am

You’re welcome… Can you also mark it solved ?