Listing description character limit

functions.php

// Limit listing description character length
add_filter('submit_job_form_validate_fields', function( $isValid, $fields, $values ) {
    $description_character_limit = 280;

    foreach ( $fields['job'] as $key => $field ) {
        if ($field['slug'] == 'job_description' && isset($values['job']['job_description']) && strlen($values['job']['job_description']) > $description_character_limit) {
            return new \WP_Error( 'validation-error', sprintf( __( '%s can\'t be longer than %s characters.', 'my-listing' ), $field['label'], $description_character_limit ) );
        }
    }

    return $isValid;
}, 100, 3);