Summary - Data types

Combine string, int, float, bool and null types to build an inventory record.

Summary: five core types

In this group you learned five scalar types:

string — text, in quotes.
integer — whole number, no decimal.
float — fractional number, with a dot.
boolean — true or false.
null — no value.

Use gettype() to inspect a type and var_dump() for detailed output.

Now you will combine these types into a single inventory record.

Exercise Print the inventory record

Define five variables for an inventory record: $productName = "Pen", $quantity = 50, $price = 12.5, $inStock = true, $note = null. Print five lines: the product name, quantity, price, active status (shows 1) and the note inside [note] brackets.

Show example solution

$productName, $quantity, $price, $inStock and "[" . $note . "]"; add "\n" to each line.
Example solution:
<?php
$productName = "Pen";
$quantity = 50;
$price = 12.5;
$inStock = true;
$note = null;
echo $productName . "\n";
echo $quantity . "\n";
echo $price . "\n";
echo $inStock . "\n";
echo "[" . $note . "]\n";

Test yourself

Which one creates a bool variable?
- $ok = true;
- $ok = "true";
- $ok = 1;
- $ok = 1.0;
Show answer

$ok = true; — Correct! The unquoted true keyword is a bool.
Define a float price for the inventory record
```
$price = ____;
```
Show answer
```
$price = 12.5;
```
Match each type to an example value

string

"Hello"
integer

42
float

3.14
boolean

true
NULL

null

Next lesson: Project: Calculator

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