PHP FUNCTION PROBLEM

Hi there, i do not understand php very well.. i have this:

No1 <?php echo do_shortcode(‘[some shortcode]’); ?>

this is to use the shortcode in the template, but in fact this shortcode i want to call here changes a lot.. and i want to call it in too many pages..

so i create this:

No2 function store_shortcode() {echo ‘[my_short_code]’;}

it is possible to call the no2 in to the no1??