cannot be installed under PHP 5.4

[contao]

cannot be installed under PHP 5.4

[leofeyer]

So then just switch to PHP 5.5.

[fritzmg]

The official documentation lists PHP 5.4 as the minimum requirement for Contao 4, not PHP 5.5. That's why I reported it.

[fritzmg]

Even if you install Contao by using PHP >=5.5 via composer create-project contao/standard-edition <target> - and then deploy the Contao installation onto another server, which happens to have only PHP 5.4, which is the defined minimum requirement to run Contao 4, you might run into problems, since the installed versions of these bundles are not guaranteed to run under PHP 5.4. You'll need to run a composer update on the new server again, to downgrade.

The composer.lock file of contao/standard-edition should be created under the minimum requirement environment, i.e. PHP 5.4.0 in this case, so that no packages with higher requirements will be present in the lock file.

[leofeyer]

PHP 5.4, which is the defined minimum requirement to run Contao 4

The minimum PHP version for Contao 4 is 5.5 (see composer.json).

[fritzmg]

The minimum PHP version for Contao 4 is 5.5 (see composer.json).

The minimum PHP version for contao/core-bundle 4.1.2 is 5.4 » composer.json
Likewise, the minimum PHP version for contao/standard-edition 4.1.2 is 5.4 » composer.json
Also the composer.lock file of contao/standard-edition has PHP 5.4 defined as the minimum requirement for all contao bundles and components - with exception to the aforementioned packages, that lead to the error described in this issue.

Even when you specifically request contao/standard-edition 4.1.2, which has PHP 5.4 as its minimum requirement, it will lead to the error described in this issue:

composer create-project contao/standard-edition . 4.1.2
Installing contao/standard-edition (4.1.2)
  - Installing contao/standard-edition (4.1.2)
    Loading from cache

Created project in .
Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for doctrine/cache v1.6.0 -> satisfiable by doctrine/cache[v1.6.0].
    - doctrine/cache v1.6.0 requires php ~5.5|~7.0 -> your PHP version (5.4.45) does not satisfy that requirement.
  Problem 2
    - Installation request for doctrine/common v2.6.1 -> satisfiable by doctrine/common[v2.6.1].
    - doctrine/common v2.6.1 requires php ~5.5|~7.0 -> your PHP version (5.4.45) does not satisfy that requirement.
  Problem 3
    - Installation request for league/uri 4.1.0 -> satisfiable by league/uri[4.1.0].
    - league/uri 4.1.0 requires php >=5.5.9 -> your PHP version (5.4.45) does not satisfy that requirement.
  Problem 4
    - doctrine/cache v1.6.0 requires php ~5.5|~7.0 -> your PHP version (5.4.45) does not satisfy that requirement.
    - doctrine/doctrine-cache-bundle 1.3.0 requires doctrine/cache ^1.4.2 -> satisfiable by doctrine/cache[v1.6.0].
    - Installation request for doctrine/doctrine-cache-bundle 1.3.0 -> satisfiable by doctrine/doctrine-cache-bundle[1.3.0].

[leofeyer]

No, it is PHP 5.5 and it always has been. We just have not update the composer.json file.

Contao 4 uses third-party libraries which require PHP 5.5, therefore the implicit minimum version was PHP 5.5 all the time. Changing the composer.json file only makes it an explicit requirement.

[fritzmg]

No, it is PHP 5.5 and it always has been.

That's not true, Contao 4.0.x for example has neither an explicit nor an implicit requirement for PHP 5.5. Thus

composer create-project contao/standard-edition <target> ~4.0.0

(and Contao itself) runs fine under PHP 5.4. The PHP 5.5 requirement started with Contao 4.1.0-beta1 as far as I can see.

I'll make a pull request for the documentation, if needed.

[leofeyer]

I'm going to stop discussing this now. It is pointless.

[fritzmg]

? I don't understand, why is it pointless? Officially, Contao 4 still lists PHP 5.4 as its minimum requirement (I am not talking about the implicit requirement through the package management). Some users might run into this issue, if they, for some reason want to or need to run or install Contao ~4.1 under PHP 5.4.

Thus it would have been important to find out why it is not possible to install Contao 4(.1) under PHP 5.4 - and since the requirement indeed has been increased with Contao 4.1 to PHP 5.5, it would be important to reflect that change in the official documentation. Do you not agree with that 😕 ?

[aschempp]

We sure should update docs, but there's nothing we can change on Contao code side, also because PHP 5.4 is end of life and should not be used anyway.