PHP Fatal error: Can't use function return value in write context in /root/bin/howdoi on line 19

[justsheep]

mkdir -p ~/bin && wget https://raw.githubusercontent.com/san-kumar/howdoi/master/howdoi -O ~/bin/howdoi && chmod +x ~/bin/howdoi
it's ok.
sudo ln -s ~/bin/howdoi /usr/local/bin/howdoi
it's ok.
howdoi check my linux version
PHP Fatal error: Can't use function return value in write context in /root/bin/howdoi on line 19
how can I solve this problem?

[san-kumar]

this looks like a problem with your php setup.

1. Can you tell me which PHP version you are using?
2. Can you upgrade to PHP 7+ and try with that?

[justsheep]

this looks like a problem with your php setup.

1. Can you tell me which PHP version you are using?
2. Can you upgrade to PHP 7+ and try with that?

oh, yum install php is php5
now, I compiled php7