Migrating to `v0.16`

Void Return Type for Functions Without Explicit Return

Functions and methods without an explicit Rust return type now declare void as their PHP return type.

Before (v0.15)

#[php_function]
pub fn do_something() {
    println!("Hello");
}

Generated PHP signature: function do_something() (implicit mixed return)

After (v0.16)

The same Rust code now generates: function do_something(): void

Migration

If your function actually returns a value but didn’t declare it, you must now add the return type:

// Before: worked but was incorrect
#[php_function]
pub fn get_value() {
    42  // implicitly returned, but no declared type
}

// After: must declare return type
#[php_function]
pub fn get_value() -> i32 {
    42
}

Exceptions

The magic methods __destruct and __clone are excluded from this change, as PHP forbids return type declarations on them.

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