পিএইচপি nested-index

<?php

$user = [
    "নাম"  => "মোঃ আরিফ",
    "দক্ষতা" => ["পিএইচপি", "জাভা", "পাইথন", "জাভাস্ক্রিপ্ট"]
];

echo "<h3>তথ্য</h3>";

echo "<table border='1'>";

echo "<tr>";
echo "<th>নাম</th>";
echo "<td>" . $user["নাম"] . "</td>";
echo "</tr>";

echo "<tr>";
echo "<th>দক্ষতা</th>";
echo "<td>" . implode(", ", $user["দক্ষতা"]) . "</td>";
echo "</tr>";

echo "</table>";

?>