Answer 1

You are free to choose which one to use, however, there are differences (minor), see the links after the code.

<?php
$a=10;
$b=20;
$c=30;
// print only accepts one argument, so the
// following line will trigger error (unexpected "," on the error message)
print $a,$b,$c, "<br />";
// echo accepts multiple arguments, so the
// next line will run just fine.
echo $a,$b,$c, "<br />";
?>

http://www.differencebetween.info/difference-between-echo-and-print-in-php

https://stackoverflow.com/questions/234241/how-are-echo-and-print-different-in-php

https://www.quora.com/What-is-the-difference-between-echo-and-print-in-PHP

Hth, cmiiw