PHP 5.4 compatibility issues

[ic1011]

Getting Started

The above page says that Doctrine 2 is PHP 5.4+ compatible but in reality it is not.

The class Doctrine\Common\Proxy\ProxyGenerator contains the following code which requires PHP 5.5 and above:

    protected $placeholders = [
        'baseProxyInterface'   => Proxy::class, 
        'additionalProperties' => '',
    ];

PHP 5.5 - New features - class name

[Majkl578]

You can explicitly require older doctrine/common. Version 2.6 (current) requires 5:5+, older version PHP 2.5 requires PHP 5.4+.

[ic1011]

Okay. Thank you. Are they interchangeable? Should I expect any major drawbacks in the functionality?
I already have the Domain structure and I am just trying to use it on different machine where the PHP currently cannot be upgraded.

[Ocramius]

Docs page indeed needs updating: specifically, removal of explicit requirements, since composer tells you those.
We could simplify it to something like "always use the latest stable version of PHP".

Anyway, this is typically caused by a composer update issued on a machine with newer PHP versions, and then deploying via composer install on a machine with older PHP versions (tip: don't do that, or specify a platform version in your composer.json).

If you want to help out with the wording, check getting-started.rst and edit it to reflect the wording that you'd prefer.

[Ocramius]

Was handled by @BreiteSeite in #5892