Summary - Variables

Combine variable declaration, assignment and checks to build a user info card.

Summary: Variables

In this group you built the foundation of variables. You learned:

declaring variables with $ and =.
naming principles and case sensitivity.
reassignment, increasing and decreasing with ++ and --.
combining with . and doing arithmetic with numbers.
checking variables with isset() and unset().

Now you will combine all of this into a user info card.

Exercise Build a user info card

Assign "Alex" to $userName and "Berlin" to $city. On the first line, print Alex - Berlin using $userName . " - " . $city . "\n". Remove $city with unset($city). On the second line, print "City set: " . isset($city) . "\n".

Show example solution

On the first line combine $userName and $city with a dot; then unset, then isset on the second line.
Example solution:
<?php
$userName = "Alex";
$city = "Berlin";
echo $userName . " - " . $city . "\n";
unset($city);
echo "City set: " . isset($city) . "\n";

Test yourself

Which function is used to delete a variable?
- unset()
- isset()
- delete()
- remove()
Show answer

unset() — Correct! unset() completely destroys a variable.
Declare the counter
```
____visitors = 0;
```
Show answer
```
$visitors = 0;
```
Match each concept to its description

$ sign

starts a variable name
++

increases by one
.

combines two values
unset()

deletes the variable

Next lesson: string and int

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