rector/rules/Php80/NodeResolver/RequireOptionalParamResolver.php

<?php

declare (strict_types=1);
namespace Rector\Php80\NodeResolver;

use PhpParser\Node\FunctionLike;
use PhpParser\Node\Param;
use PhpParser\Node\Stmt\ClassMethod;
final class RequireOptionalParamResolver
{
    /**
     * @param ClassMethod $functionLike
     * @return Param[]
     */
    public function resolve(\PhpParser\Node\FunctionLike $functionLike) : array
    {
        $optionalParams = [];
        $requireParams = [];
        foreach ($functionLike->getParams() as $position => $param) {
            if ($param->default === null) {
                $requireParams[$position] = $param;
            } else {
                $optionalParams[$position] = $param;
            }
        }
        return $requireParams + $optionalParams;
    }
}