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优雅地处理 PHP 空值
dev-master
2018-05-29 13:28 UTC
This package is not auto-updated.
Last update: 2024-09-20 02:47:37 UTC
README
优雅地处理 PHP 空值
示例
来源自 (http://nitschinger.at/A-Journey-on-Avoiding-Nulls-in-PHP/)
<?php
include "vendor/autoload.php";
use Optional\Optional;
$possible = Optional::of(5);
var_dump($possible->isPresent()); // bool(true)
var_dump($possible->get()); // int(5)
var_dump($possible->getOrElse(99)); // int(5)
var_dump($possible->getOrNull()); // int(5)
$possible = Optional::of(null); // Throws 'NullPointerException' with message 'Unallowed null in reference found.'
$possible = Optional::fromNullable(null);
var_dump($possible->isPresent()); // bool(false)
var_dump($possible->get()); // Throws IllegalStateException
var_dump($possible->getOrElse(99)); // int(99)
var_dump($possible->getOrNull()); // NULL
$val1 = Optional::fromNullable(5);
$val2 = Optional::fromNullable(4);
$val3 = Optional::fromNullable(4);
var_dump($val1->equals($val2)); // bool(false)
var_dump($val2->equals($val3)); // bool(true)