无法在我的mac中更新php 7 cli

Question

To install php7 I run:

curl -s http://php-osx.liip.ch/install.sh | bash -s 7.1  
php -v

It show php 5.6.30

Then, I run this in my terminal:

export PATH=/usr/local/php5/bin:$PATH
php-v 

It show the latest version of php : 7.1 .

When I closing the terminal and run the php -v again. it show the old version php again 5.6.30

Why is this happening?