PHP中多层嵌套JSON数组如何正确输出性别和人数？

<code class="php">for ($i = 0; $i < count($chcd); $i++) {
    echo "<h3>{$chcd[$i]['school']} {$chcd[$i]['c']} ({$chcd[$i]['g']})</h3>"; //修正后的输出
    foreach ($chcd[$i]['n'] as $val) {
        echo "<p>{$val}</p>
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    }
    echo '<hr>'; //简化HTML
}</code>