php-snippet in code-block doesn't work

Hi, documtentation says that php should run in code-blocl elements, but it doesnt.

Its about this code:

<form role=”search” method=”get” class=”search-form”
action=”<?php echo site_url( ‘search-results/’ ); ?>”>
<label>
<span class=”screen-reader-text”>
<?php echo _x( ‘Search for:’, ‘label’ ) ?>
</span>
<input type=”search” class=”search-field”
name=”searchwp”
placeholder=”<?php echo esc_attr_x( ‘Search…’, ‘placeholder’ ) ?>”
value=”<?php echo isset( $_GET[‘searchwp’] ) ? esc_attr( $_GET[‘searchwp’] ) : ” ?>”
title=”<?php echo esc_attr_x( ‘Search for:’, ‘label’ ) ?>” />
</label>
<input type=”submit” class=”search-submit”
value=”<?php echo esc_attr_x( ‘Search’, ‘submit button’ ) ?>” />
</form>

You can see the result at the URL I posted in the private area.
Why isn’t it running?

Thanks for supporting!