What built-in data types do PHP functions return?

PHP functions can return various built-in data types, including: 1. Integer; 2. Floating point number; 3. String; 4. Boolean value; 5. Array; 6. Object; 7. NULL.

#What built-in data types do PHP functions return?

PHP functions can return various built-in data types, including:

• Integer (int)
• Floating point number (float)
• String(string)
• Boolean value(bool)
• Array(array)
• Object(object)
• NULL

Practical Case

Suppose we have a function calculate_age(DOB) to calculate age based on a given date of birth. This function returns the age as an integer.

function calculate_age(string $DOB): int
{
    $dobDate = new DateTime($DOB);
    $todayDate = new DateTime('today');
    $age = $todayDate->diff($dobDate)->y;

    return $age;
}

Call this function:

$age = calculate_age('1980-01-01');
echo "Age: $age"; // 输出：Age: 43

Other examples

##

function is_valid(string $email): bool
{
  return filter_var($email, FILTER_VALIDATE_EMAIL);
}

• function get_products(): array
  {
    // 从数据库获取产品列表
    $productDetails = [
        ['id' => 1, 'name' => 'Product 1'],
        ['id' => 2, 'name' => 'Product 2']
    ];
  
    return $productDetails;
  }

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