%s::%s(): Return type must be %s when declared

Description

The magic methods __sleep and __serialize may be left without a return type. By construction, PHP uses array for them.

So, when a return type is written in the source, for these methods, it must be array.

Here is the list of compulsory return types:

• __destruct() : void

• __construct() : void

• __unserialize() : void

• __unset() : void

• __set() : void

• __serialize() : array

• __isset() : bool

• __toString() : string.

Example

<?php

class X {
    function __construct() : int {}

    function __sleep() : int {}

    function __serialize() : int {}

    function __isset() : int {}
}

?>

Literal Examples

• X::__sleep(): Return type must be array when declared

• X::__construct(): Return type must be void when declared

• X::__isset(): Return type must be bool when declared

Solutions

• Give the correct return type to the magic method.

• Remove the return type of the magic method.