What does question mark (?) before type declaration means in php (?int) [duplicate]

It’s called Nullable types.

Which defines ?int as either int or null.

Type declarations for parameters and return values can now be marked as nullable by prefixing the type name with a question mark. This signifies that as well as the specified type, NULL can be passed as an argument, or returned as a value, respectively.

Example :

function nullOrInt(?int $arg){
    var_dump($arg);
}

nullOrInt(100);
nullOrInt(null);

function nullOrInt will accept both null and int.

Ref: http://php.net/manual/en/migration71.new-features.php