I have looked through the PHP-Fig website for any PSR related to alternative PHP syntax for control structures but failed to find anything about it.
The alternative syntax is this for example:
<?php foreach ($arr as $foo) : ?>
<h1>block start</h1>
<?php if ($foo === 'test') : ?>
<a>Case1</a>
<?php elseif ($foo === 'test2') : ?>
<a>Case2</a>
<?php else : ?>
<a>CaseElse</a>
<?php endif; ?>
<h1>block end</h1>
<?php endforeach; ?>
So is it just not defined and thus ok to use, or is it not compliant since there is no mention about it in the coding style sections?