PHP Loop Examples: FizzBuzz, Tables, Lists and Totals

These examples combine loops with conditions and arrays. Read the code, run it and change it.

FizzBuzz

Print 1 to 15. For multiples of 3 print Fizz, for 5 print Buzz, and for both print FizzBuzz.

index.php

PHP

<?php
for ($i = 1; $i <= 15; $i++) {
    if ($i % 15 === 0) {
        echo "FizzBuzz\n";
    } elseif ($i % 3 === 0) {
        echo "Fizz\n";
    } elseif ($i % 5 === 0) {
        echo "Buzz\n";
    } else {
        echo $i . "\n";
    }
}

Output

OUTPUT

1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
FizzBuzz

The check for 15 comes first, because 15 is also a multiple of 3 and 5.

A product list in HTML

index.php

PHP

<?php
$products = [
    ["name" => "Notebook", "price" => 80],
    ["name" => "Pen", "price" => 12],
    ["name" => "Bag", "price" => 799],
];

echo "<ul>\n";
foreach ($products as $p) {
    echo "  <li>" . htmlspecialchars($p["name"]) . " - " . $p["price"] . "</li>\n";
}
echo "</ul>";

Output

OUTPUT

<ul>
  <li>Notebook - 80</li>
  <li>Pen - 12</li>
  <li>Bag - 799</li>
</ul>

A shopping cart total

index.php

PHP

<?php
$cart = [
    ["name" => "Pen", "price" => 12, "qty" => 5],
    ["name" => "Book", "price" => 250, "qty" => 2],
];

$total = 0;

foreach ($cart as $line) {
    $lineTotal = $line["price"] * $line["qty"];
    echo "{$line['name']} x {$line['qty']} = $lineTotal\n";
    $total += $lineTotal;
}

echo "Total: $total";

Output

OUTPUT

1
2
3

Pen x 5 = 60
Book x 2 = 500
Total: 560

Count words

index.php

PHP

<?php
$text = "the cat and the hat and the bat";
$counts = [];

foreach (explode(" ", $text) as $word) {
    $counts[$word] = ($counts[$word] ?? 0) + 1;
}

print_r($counts);

Output

OUTPUT

Array
(
    [the] => 3
    [cat] => 1
    [and] => 2
    [hat] => 1
    [bat] => 1
)

Prime numbers up to 30

index.php

PHP

<?php
for ($n = 2; $n <= 30; $n++) {
    $isPrime = true;

    for ($d = 2; $d * $d <= $n; $d++) {
        if ($n % $d === 0) {
            $isPrime = false;
            break;
        }
    }

    if ($isPrime) {
        echo $n . " ";
    }
}

Output

OUTPUT

2 3 5 7 11 13 17 19 23 29

Exercise: even numbers sum

Add all the even numbers from 1 to 20 and print the total.

Show a possible solution

index.php

PHP

<?php
$sum = 0;

for ($i = 2; $i <= 20; $i += 2) {
    $sum += $i;
}

echo $sum;

Output

OUTPUT