When php echo and return, <?php is automatically added in front of it.

Question

As shown in the picture, whether it is echo or return, check the source code of the web page and find that it will be preceded by <?php

Does anyone know the reason? The TP5 framework is used. It was good at first, but I don’t know what was changed and it became like this

Answer 1

See if the inherited class has been output by you