how to declare array with key in php code example

Example 1: assign $variable of key value pair array to multiple variables php

$healthStructureData = [
            'product' => $product,
            'website_data' => $website_data,
            'total_keywords' => $total_keywords,
            'certificate_status' => $certificate_status,
            'total_user_websites' => $total_user_websites,
        ];

foreach ($healthStructureData as $key => $value) {
  $$key = $value;
}

Example 2: php array

<?php
$array = array(
    "foo" => "bar",
    42    => 24,
    "multi" => array(
         "dimensional" => array(
             "array" => "foo"
         )
    )
);

var_dump($array["foo"]);
var_dump($array[42]);
var_dump($array["multi"]["dimensional"]["array"]);
?>