php drop down menu to execute script with argument

I have shell script which I run like this /var/www/test.sh 2015 or /var/www/test.sh 2014 When this script runs, it actually takes data from freeradius and generates gnuplot base graph for the specific year in the www folder like /var/www/output.jpg Now I want to make a php drop down menu with years like 2015, 2014 and so on, and when user select any year, it should run the script with the specific choice year. ***But how can I pass year to the shell script.*** so far I have tried this but its not working. root@rm:/var/www# cat test5.php some title " /> root@rm:/var/www#