title: How to run yii2mod/yii2-ftp in php 5.5.9?
body: <p>I'm try to install yii2 vendor yii2mod/yii2-ftp. But failed cause PHP version in my serve is 5.5.9</p>
  
  <p>Any solution beside update my php to use this vendor ?</p>
  
  <pre><code>Problem 1
  - phpunit/phpunit-mock-objects 3.4.3 requires php 5.6 || 7.0 -&gt; your PHP version (5.5.9-1ubuntu4.14) does not satisfy that requirement.
  - phpunit/phpunit-mock-objects 3.4.3 requires php 5.6 || 7.0 -&gt; your PHP version (5.5.9-1ubuntu4.14) does not satisfy that requirement.
  - phpunit/phpunit-mock-objects 3.4.3 requires php 5.6 || 7.0 -&gt; your PHP version (5.5.9-1ubuntu4.14) does not satisfy that requirement.
  - Installation request for phpunit/phpunit-mock-objects == 3.4.3.0 -&gt; satisfiable by phpunit/phpunit-mock-objects[3.4.3].
  
  $ php -v
  PHP 5.5.9
  </code></pre>