What is the difference please?

Question

Hello,I need your help: I didn't understand this part of the code extract of an exercice of the site "Codeschool". Can you enlighten me please?
------
<?php
$city='Tokyo';
$established='1868';
$country='Japan';
?>

(What is the difference between this two code? Why there are point after variable "established" and not after "city"?)

<p><?php echo $city. 'has a very high population' ; ?> </p>
<p><?php echo $city the capital of country and was established in $established. ; ?></p>

Thank 's in advance😉

Answer 1

the dot ( .) concatenation operator is used to join to strings.

Answer 2

Thank you 😀