<?php namespace NXP\Classes; class Token { public const Literal = 'literal'; public const Variable = 'variable'; public const Operator = 'operator'; public const LeftParenthesis = 'LP'; public const RightParenthesis = 'RP'; public const Function = 'function'; public const ParamSeparator = 'separator'; public const String = 'string'; public const Space = 'space'; public string $type = self::Literal; public $value; public ?string $name; public ?int $paramCount = null;//to store function parameter count in stack /** * Token constructor. * */ public function __construct(string $type, $value, ?string $name = null) { $this->type = $type; $this->value = $value; $this->name = $name; } }