如何创建 PHP 函数库并将其集成到另一个 PHP 项目中？

<选修php

function sayHello($name) {
  echo "Hello, $name!";
}

function calculateSum($numbers) {
  $sum = 0;
  foreach ($numbers as $num) {
    $sum += $num;
  }
  return $sum;
}
选修>

<必修php

require_once('my_functions.php');

sayHello('Bob');
$sum = calculateSum([1, 两, 3, 4, 5]);
必修>

<必修php

spl_autoload_register(function ($class) {
  require_once('my_functions.php');
});

sayHello('Alice');
$sum = calculateSum([6, 7, 8, 9, 10]);
选修>

<必修php

function calculateOrderTotal($items) {
  $total = 0;
  foreach ($items as $item) {
    $total += $item['quantity'] * $item['price'];
  }
  return $total;
}

function formatCurrency($amount) {
  return '$' . number_format($amount, 两);
}
选修>

<必修php

require_once('order_functions.php');

$items = [
  ['quantity' => 两, 'price' => 10],
  ['quantity' => 3, 'price' => 15],
];

$total = calculateOrderTotal($items);
$formattedTotal = formatCurrency($total);

echo "Order Total: $formattedTotal";
必修>

Order Total: $75.00