PHP function return value type determines the data type returned by the function, including scalar types (int, float, string, bool, resource), composite types (array, object) and special types (null, void). In practice, functions can return specific types of return values, such as integers, arrays, or objects, ensuring the correctness and robustness of applications.
Common function return value types in PHP
In PHP, the function return value type determines the type of data returned by the function , which is crucial to ensure the correctness and robustness of the application. The following are some common PHP function return value types:
1. Scalar type
int
: Integer Typefloat
: floating point type string
: string bool
: Boolean type resource
: Resource, such as a file handle or database connection2. Composite type
array
:Arrayobject
:Object##3. Special type
: means there is no value
: means the function does not return any value
Practical case:
1. Get the integer return value
function sum($a, $b) { return $a + $b; } $result = sum(5, 10); var_dump($result); // 结果:int(15)
2. Get the array return value
function getUserData($id) { // 从数据库获取用户信息 // ... return [ 'name' => 'John Doe', 'email' => 'john@example.com', ]; } $userData = getUserData(1); var_dump($userData); // 结果:array(2) { ["name"]=> string(8) "John Doe" ["email"]=> string(19) "john@example.com" }
3 . Get the object return value
class User { // ... } function createUser() { return new User(); } $user = createUser(); var_dump($user); // 结果:object(User) #1 (0) { }
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