A simple "elvis" operator in PHP

elvis.php

<?php

function elvis($object, $path = null) {
    return array_reduce(explode('.', $path), function ($subObject, $segment) {
        return isset($subObject[$segment]) ? $subObject[$segment] : null;
    }, $object);
}

// Example
$o = [ 'a' => [ 'b' => 1, 'c' => 2 ], 'd' => 3 ];
var_dump(elvis($o, 'a'));
// = [ 'b' => 1, 'c' => 2 ]
var_dump(elvis($o, 'a.b'))
// = 1
var_dump(elvis($o));
// = [ 'a' => [ 'b' => 1, 'c' => 2 ], 'd' => 3 ]
var_dump(elvis($o, 'x'));
// = null

isset($subObject[$segment]) ? $subObject[$segment] : null is equivalent to $subObject[$segment], since isset just checks if something is not null. At least I think.