How do you navigate through an $data array in #PHP?

(1) Nested if with "isset":

if(isset($data["person"])){
if(isset($data["person"]["address"]){ ... }
}

(2) Nested if with "array_key_exists":

if(array_key_exists("person", $data)){
if(array_key_exists("address", $data["person"]){ ... }
}

(3) Null Coalescing Operator:

$address = $data["person"]["address"] ?? null;

#php #phpquestion #phpcommunity