<?php
function wp_register_custom_classname_support($block_type)
{
$has_custom_classname_support = true;
if (property_exists($block_type, 'supports')) {
$has_custom_classname_support = _wp_array_get($block_type->supports, array('customClassName'), true);
}
if ($has_custom_classname_support) {
if (!$block_type->attributes) {
$block_type->attributes = array();
}
if (!array_key_exists('className', $block_type->attributes)) {
$block_type->attributes['className'] = array('type' => 'string');
}
}
}
function wp_apply_custom_classname_support($block_type, $block_attributes)
{
$has_custom_classname_support = true;
$attributes = array();
if (property_exists($block_type, 'supports')) {
$has_custom_classname_support = _wp_array_get($block_type->supports, array('customClassName'), true);
}
if ($has_custom_classname_support) {
$has_custom_classnames = array_key_exists('className', $block_attributes);
if ($has_custom_classnames) {
$attributes['class'] = $block_attributes['className'];
}
}
return $attributes;
}
WP_Block_Supports::get_instance()->register('custom-classname', array('register_attribute' => 'wp_register_custom_classname_support', 'apply' => 'wp_apply_custom_classname_support'));