composer php - PHP error: "The zip extension and unzip command are both missing, skipping."

Question

When I run a composer update I get this error message:

Loading composer repositories with package information
Updating dependencies (including require-dev)
    Failed to download psr/log from dist: The zip extension and unzip command are both missing, skipping.
The php.ini used by your command-line PHP is: /etc/php/7.0/cli/php.ini
    Now trying to download from source

What do I need to do to enable the zip and unzip commands so that composer can download dependencies?

Answer 1

Depending on your flavour of Linux and PHP version these may vary.

(sudo) yum install zip unzip php-zip
(sudo) apt install zip unzip php-zip

This is a very commonly asked question, you'll be able to find more useful info in the aether by searching <distro> php <version> zip extension.