PHP Examples

for ($n = 1; $n <= 20; $n++) {
    echo match (true) {
        $n % 15 === 0 => 'FizzBuzz',
        $n % 3  === 0 => 'Fizz',
        $n % 5  === 0 => 'Buzz',
        default       => $n,
    }, PHP_EOL;
}

$text = 'the quick brown fox jumps over the lazy dog the fox the fox';

$counts = array_count_values(explode(' ', $text));
arsort($counts);

foreach (array_slice($counts, 0, 3, true) as $word => $n) {
    echo "$word: $n", PHP_EOL;
}

$data = json_decode(
    '[{"name":"Ada","age":36},{"name":"Linus","age":42}]',
    true,
    flags: JSON_THROW_ON_ERROR,
);

$fh = fopen('out.csv', 'w');
fputcsv($fh, ['name', 'age']);
foreach ($data as $row) {
    fputcsv($fh, $row);
}
fclose($fh);

class Account {
    public function __construct(
        public readonly string $owner,
        private int $cents = 0,
    ) {}

    public function deposit(int $cents): self {
        if ($cents <= 0) throw new InvalidArgumentException('positive only');
        $this->cents += $cents;
        return $this;
    }

    public function balance(): float {
        return $this->cents / 100;
    }
}

$a = new Account('Ada');
echo $a->deposit(5000)->deposit(3000)->balance();   // 80

$ctx = stream_context_create([
    'http' => [
        'method'  => 'GET',
        'header'  => "User-Agent: iwantcoding.com/1.0\r\n",
        'timeout' => 5,
    ],
]);

$body = file_get_contents('https://httpbin.org/json', false, $ctx);
$data = json_decode($body, true);
print_r($data);

function render(string $template, array $vars): string {
    extract($vars, EXTR_SKIP);
    ob_start();
    eval('?>' . $template);
    return ob_get_clean();
}

echo render(
    'Hello, <?= htmlspecialchars($name) ?>! You have <?= $unread ?> messages.',
    ['name' => 'Ada', 'unread' => 3],
);

<?php
// Print every prime under 50 — a small grab-bag program.
for ($n = 2; $n < 50; $n++) {
    $isPrime = true;
    for ($d = 2; $d * $d <= $n; $d++) {
        if ($n % $d === 0) { $isPrime = false; break; }
    }
    if ($isPrime) echo $n, ' ';
}