If I display a variable in function.php via echo, is it displayed on all pages?

Question

WordPress

something is not visible
in function.php through echo I display an array, for some reason it is not visible on the page

Answer 1

The echo function only works with strings, if you need to print an array, use print_r
https://www.php.net/manual/en/function.echo.php
https://www.php.net/manual/en/function.print- r.php