php variable in html no other way than: ＜?php echo $var; ?＞

Yes, that is one way to output the value of a PHP variable in HTML. Here are a few other options:

Using short tags: If you have short tags enabled in your PHP configuration, you can use <?= $var ?> to output the value of a variable.
Using a HEREDOC string: You can use a HEREDOC string to output multiple lines of HTML and include the value of a PHP variable within the HTML. For example:

Example of using a HEREDOC string in PHP

<?php

$var = "Hello World!";
$html = <<<EOT
<div>
   The value of the variable is: $var
</div>
EOT;

echo $html;

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Using a double-quoted string: You can also use a double-quoted string to output HTML and include the value of a PHP variable within the HTML. For example:

Example of using a double-quoted string to output HTML and include the value of a PHP variable within the HTML

<?php

$var = "Hello World!";
echo "<div>The value of the variable is: $var</div>";

Keep in mind that you should use single quotes (') around HTML attributes to avoid having to escape double quotes. For example:

Example of using single quotes (') around HTML attributes in PHP to avoid having to escape double quotes HTML

<?php

$var = "Hello World!";
echo "<div class='container'>The value of the variable is: $var</div>";