wp-includes/class-wp-customize-setting.php:955Will attempt to check if a specific value in a multidimensional array is set.
$rootarray$keysarraybool final protected function multidimensional_isset( $root, $keys ) { $result = $this->multidimensional_get( $root, $keys ); return isset( $result ); }Introduced in 3.4.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-customize-setting.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.