Silm

<?php
$arr = [
    ['firsname' => 'Иван', 'lastname' => 'Иванов'],
    ['firsname' => 'Петр', 'lastname' => 'Петров'],
    ['firsname' => 'Сергей', 'lastname' => 'Сергеев'],
]
?>

<table>
<tr><th>ID</th><th>Имя</th><th>Фамилия</th></tr>
<?php foreach($arr as $key => $person): ?>
  <tr>
  <td><?=$key?></td>
  <td><?=$person['firsname']?></td>
  <td><?=$person['lastname']?></td>
  </tr>
<?php endforeach ?>
</table>

<?php $a = 'https://www.google.ru'; ?>
<script src="<?=$a?>"></script>

<?php 
$radio_btns = [
    ['label' => 'yellow', 'value' => 'yellow'],
    ['label' => 'red', 'value' => 'red'],
    ['label' => 'blue', 'value' => 'blue'],
];

$checked_value = 'red';
?>

<?php foreach($radio_btns as $radio): ?>
    <?=$radio['label']?>: 
    <input name='header' type="radio" <?=$radio['value'] === $checked_value ? 'checked' : ''?> value='<?=$radio['value']?>'>
<?endforeach?>