php-parser/lib/PhpParser/Node/Arg.php

<?php declare(strict_types=1);

namespace PhpParser\Node;

use PhpParser\NodeAbstract;

class Arg extends NodeAbstract
{
    /** @var Expr Value to pass */
    public $value;
    /** @var bool Whether to pass by ref */
    public $byRef;
    /** @var bool Whether to unpack the argument */
    public $unpack;

    /**
     * Constructs a function call argument node.
     *
     * @param Expr  $value      Value to pass
     * @param bool  $byRef      Whether to pass by ref
     * @param bool  $unpack     Whether to unpack the argument
     * @param array $attributes Additional attributes
     */
    public function __construct(Expr $value, bool $byRef = false, bool $unpack = false, array $attributes = []) {
        parent::__construct($attributes);
        $this->value = $value;
        $this->byRef = $byRef;
        $this->unpack = $unpack;
    }

    public function getSubNodeNames() : array {
        return ['value', 'byRef', 'unpack'];
    }
    
    public function getType() : string {
        return 'Arg';
    }
}