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@ 2021-10-20T04:10:14Z

<?php

$arr = (object)[
    "svg" => (array)[
        (object)[],
        (object)[
            "linearGradient" => [
                (object)[
                    "@style" => "testing",
                ],
            ],
        ],
    ],
];

$str = "svg.1.linearGradient.0.@style";
$keys = explode('.', $str);
$val = $arr;
foreach($keys as $key) {
  $val =  is_object($val) 
    ? $val->$key 
    : $val[$key];
}

echo $val;

Output
Performance
VLD
References
Branches

explode: documentation ( source)

preferences:dark modelive previewkey bindings

90.95 ms | 1385 KiB | 5 Q