WP_Comment::__isset() │ public │ WP 4.4.0

Determines whether a non-public property is set.

If $name matches a post field, the comment post will be loaded and the post's value checked.

Method of the class: WP_Comment{}

No Hooks.

Returns

true|false. Whether the property is set.

Usage

$WP_Comment = new WP_Comment();
$WP_Comment->__isset( $name );
$name(string) (required)
Property to check if set.

Changelog

Since 4.4.0 Introduced.

WP_Comment::__isset() code WP 6.8.1

wp-includes/class-wp-comment.php 
public function __isset( $name ) {
	if ( in_array( $name, $this->post_fields, true ) && 0 !== (int) $this->comment_post_ID ) {
		$post = get_post( $this->comment_post_ID );
		return property_exists( $post, $name );
	}

	return false;
}