I have something like this in one of my views

```
<li <?php $isCurrent ? echo 'class="current"' : ''?> >
    <a href="SOME_LINK" class="SOME_CLASS">SOME_TEXT</a>
</li>

```

This causes a syntax error, unexpected T\_ECHO. Changing `echo` for `print` solves the issue, but I would like to understand why I cannot use `echo`.