Show difference between return and echo keyword in PHP

return_vs_echo.php

<?php

$name = "Bob";
echo $name;

// VS //

echo "Bob";

// ---------------------------- //

function what_is_my_name() {
    return "Bob";
} // => STRING: "Bob"

echo what_is_my_name(); // display "Bob"

$result = what_is_my_name();
echo $result; // display "Bob"

// VS //

function what_is_my_name() {
    echo "Bob";
} // => NULL

what_is_my_name(); // display "Bob"

$result = what_is_my_name();
echo $result; // display NULL