Interpolate a constant (not variable) into 'heredoc'

Question

Consider:

The value of my_const is {my_const}.

MYECHO;
?>
         


        

Answer 1

Use sprintf()

define('my_const', 100);
$string = <<< heredoc
      
The value of my_const is %s.
heredoc;

$string = sprintf($string, my_const);