Make evaled code/tokens accessible

Description

Code like:

<?php

namespace N;

class Cl {}

eval(<<<'EOF'
    use N\Cl;
    
    class U {
        /**
         * @return Cl
         */
        public function test() { throw new \Exception(); }
    }
EOF);

$u = new \U();
$refl = new \ReflectionMethod($u, 'test');
var_dump($refl->getFileName());
var_dump($refl->getDocComment());

has unusable phpdoc, as it relies on a use N\Cl; statement. The issue is phpdoc can be accessed by reflection - https://3v4l.org/djLIA - but the full evaled code is not accessible thus the use statements required to parse the phpdoc cannot be read.

At least I am unaware of any way to access the evaled code (or parsed tokens).

The ability to resolve phpdoc for classes from eval is important as annotations are used by many production libs (like Doctrine ORM) and also for static analysers.

This is a feature request to make the full evaled code accessible at least via new reflection ReflectionClass::getFileContents() method. If the parsed file tokens are already stored somewhere, providing a method to access the tokens instead of the file source code will be enough.

从 issue 中描述的 eval 和 ReflectionClass 入口点开始，调查解释器是否保留了 eval 后的源代码或已解析的 tokens。当 reflection 能够公开足够的 eval 后代码，使 phpdoc using statements 得以解析时，即视为完成；实现方式可以是通过 ReflectionClass::getFileContents()，也可以是等效的 token API。