Variadic placeholder must be last

Description

The … placeholder used for partial function application (PHP 8.5) introduces the parameters of the resulting Closure, made of every parameter of the original function that was not already given a fixed value. Because everything before it is treated as a fixed, bound argument, the placeholder itself must come last in the call; PHP has no way to bind arguments positioned after it.

Example

<?php

function add($a, $b, $c) {
	return $a + $b + $c;
}

$curried = add(..., 2, 3);

?>

Alternatives

• Put every fixed argument before …, and keep … as the final argument: add(1, 2, …).

Related error messages

• variadic-placeholder-may-only-appear-once
• cannot-combine-partial-application-and-unpacking

Changed Behavior

This error may appear following an evolution in behavior, in previous versions. See