The eval ('?> <? Php') effect in a symfony source

Question

Line 3083 of is var/cache/dev/classes.phpgiven in my Symfony project:

eval('?>'.$content);

When I look through my debugger, I see that it is $contentset to "<?php". So, the command executed here, eval('?><?php');and I suppose it should just exit and re-enter php. But my stack trace says:

at Symfony\Component\Routing\Router->generate('openid/server', array(), '1')
in vendor/symfony/symfony/src/Symfony/Bridge/Twig/Extension/RoutingExtension.php line 45

at Symfony\Bridge\Twig\Extension\RoutingExtension->getPath('openid/server')
in var/cache/dev/classes.php(3083) : eval()'d code line 106

at __TwigTemplate_796eabb7be58900d71ef26da18735885230dda71cde4d67f04a324145cd5ea80->doDisplay(array('app' => object(AppVariable)), array())
in var/cache/dev/classes.php line 4759

Line 106 whose file was executed?

Answer 1

Something I just found out the other day:

A At the very beginning of the PHP tag, a newline character should follow or it will cause a syntax error.

So this code:

'?><?php'

is not syntactically correct. But it will be:

'?><?php ' // followed by space

and it will be:

'?><?php    ' // followed by tab

and it will be:

'?><?php
' // followed by newline or carriage return

, , , $content '<?php ', ? eval (- , , ):

eval('?>'.$content. PHP_EOL);

​​ , ​​ ?

Answer 2

, eval, , , ?

php app/console cache:clear