Hashbang'd PHP script via php-version: https://github.com/wilmoore/php-version

bash.md

Get php-version @ github.com/wilmoore/php-version then:

Initial Run (my default version of PHP is 5.4.0)

./script.php

Result

Active PHP version: 5.4.0

Switch to version 5.3.10

php-version 5.3.10 >/dev/null && ./script.php

Result

Active PHP version: 5.3.10

script.php

#!/usr/bin/env php
<?php
// chmod +x script.php
echo 'Active PHP version: ', phpversion(), PHP_EOL;