Linux – upgrade ICU and intl

linuxsymfonyUbuntuubuntu-16.04

After installing Symfony 2 and check /config.php I got this notification:

intl ICU version installed on your system is outdated (55.1) and does not match the ICU data bundled with Symfony (57.1)
To get the latest internationalization data upgrade the ICU system package and the intl PHP extension.

How can I upgrade this?
I'm using Ubuntu 16.04

Best Answer

This is just a warning and you can safely ignore the message. I've response to similar questions on this. See this URL for more details:

https://github.com/symfony/symfony/issues/15007

Note: You'll also get the message when you run:

php bin/symfony_requirements

The message will say it's an "Optional recommendation".

EDIT #2

Based on your comments. You need to upgrade ICU. Sounds like you might be on Debian, and it might be possible to upgrade. Try these commands.

yum list available |grep icu

This shows what packages are available and searches for "icu". The second column shows the version. If there is a version that shows "57.1", then you should be able to use yum install to install it. Otherwise you would have to build and install on your system, which is much more difficult to give you a definite answer.

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