PHP Variables and echo

PHP variables start with a dollar sign, and echo prints text into the page the server sends back.

PHP runs on the server. Code goes between <?php and ?>, and every variable name starts with $.

PHP

<?php
$name = "Dara";
$age = 20;

echo "Name: " . $name . ", age: " . $age;

Joining strings

PHP joins strings with a dot . rather than +. Inside double quotes you can also write variables directly: "Hello $name".

Greeting · PHP

<?php
$city = "Phnom Penh";
echo "Welcome to $city!";

Expected output

Welcome to Phnom Penh!

Common mistake: Forgetting the semicolon

Each PHP statement ends with ;. A missing one causes a "syntax error, unexpected" message.

PHP Variables and echo · CodeChallenge