What are the best practices for ensuring that child elements remain hidden when parent elements are hidden in PHP and CSS?

When hiding parent elements in PHP and CSS, it is important to ensure that child elements are also hidden to maintain a consistent design. This can be achieved by applying the same visibility or display property to the child elements as the parent element. One common approach is to use PHP to add a class to the child elements when the parent is hidden, which can then be styled in CSS to keep them hidden as well. 

```php
<?php
// Check if parent element should be hidden
if($parent_hidden) {
    $child_class = 'hidden';
} else {
    $child_class = '';
}
?>
```

In the above PHP snippet, we check if the parent element should be hidden. If it should be hidden, we assign a 'hidden' class to the child elements, which can then be styled in CSS to keep them hidden as well.

Keywords

PHP CSS visibility display child elements

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