use PHP_VERSION constant

less shellcode, just use PHP_VERSION constant

http://www.php.net//manual/en/reserved.constants.php

.travis.yml

@@ -16,7 +16,7 @@ before_script:
   - sudo mkdir -p /var/qmail/bin
   - sudo cp fakesendmail.sh /var/qmail/bin/sendmail
   - sudo cp fakesendmail.sh /usr/sbin/sendmail
-  - echo 'sendmail_path = "/usr/sbin/sendmail -t -i "' | sudo tee "/home/travis/.phpenv/versions/`php -i|grep "PHP Version"|head -n 1|grep -o -P '\d+\.\d+\.\d+.*'`/etc/conf.d/sendmail.ini"
+  - echo 'sendmail_path = "/usr/sbin/sendmail -t -i "' | sudo tee "/home/travis/.phpenv/versions/`php -r 'echo PHP_VERSION;'`/etc/conf.d/sendmail.ini"
   - pwd
   - ls -al
 script: