Requiring or including a file again after modification loads old code

[adlawson]

Not a bug as such, as this makes complete sense.
It is however different behaviour to Zend's PHP and should be listed as an incompatibility.

For example, consider a case where you're doing something as god awful as trying to work around eval by writing to disc and then require-ing the file. Now also suppose you save the file with the same filename each time.

function fake_eval($code) {
    file_put_contents('/tmp/derp.php', $code);
    require '/tmp/derp.php';
}

fake_eval('<?php echo "Hello, World!";');
// => Hello, World!

fake_eval('<?php echo "Hello, World! Again.";');
// => Hello, World!

A workaround is obviously either naming the file differently each time or just not doing something so stupid in the first place, but the fact remains that the behaviour is different to Zend's PHP.

Real world use case ->

• https://github.com/adlawson/veval.php
• https://github.com/adlawson/veval.php/blob/5ff876f4e852883323144a37fd9168fad9638a12/src/Veval.php#L42-L56

[SiebelsTim]

duplicate of #1447