我file_get_contents用来获取远程定价（每天更新），substr用来只保留我想要的部分（从输出中剥离货币符号和其他数据，只保留数字）并file_put_contents用来将它存储到我引用的缓存目录中到以后。这就是我现在所拥有的：-<?php$cacheDirectory = $_SERVER['DOCUMENT_ROOT'] . '/cache/';// Small Plan - US$cachefile_SM_US = $cacheDirectory . 'SM_US.cache';if(file_exists($cachefile_SM_US)) { if(time() - filemtime($cachefile_SM_US) > 1600) { // too old , re-fetch $cache_SM_US = file_get_contents('https://remotedomain.com/?get=price&product=10¤cy=1'); $substr_SM_US = substr($cache_SM_US,17,2); file_put_contents($cachefile_SM_US, $substr_SM_US); } else { // cache is still fresh }} else { // no cache, create one $cache_SM_US = file_get_contents('https://remotedomain.com/?get=price&product=10¤cy=1'); $substr_SM_US = substr($cache_SM_US,17,2); file_put_contents($cachefile_SM_US, $substr_SM_US);}// Large Plan - US$cachefile_LG_US = $cacheDirectory . 'LG_US.cache';if(file_exists($cachefile_LG_US)) { if(time() - filemtime($cachefile_LG_US) > 1600) { // too old , re-fetch $cache_LG_US = file_get_contents('https://remotedomain.com/?get=price&product=20¤cy=1'); $substr_LG_US = substr($cache_LG_US,17,2); file_put_contents($cachefile_LG_US, $substr_LG_US); } else { // cache is still fresh }} else { // no cache, create one $cache_LG_US = file_get_contents('https://remotedomain.com/?get=price&product=20¤cy=1'); $substr_LG_US = substr($cache_LG_US,17,2); file_put_contents($cachefile_LG_US, $substr_LG_US);}当只有两种产品 (10和20) 和两种货币 (1和2) 时，这种手动方式有效，因为我只需要这样做 4 次就可以获得我需要的所有定价。但是，我打算将产品数量显着扩大到至少 12 种产品和 9 种货币，因此手动完成它们是不现实的。我相信这可以通过 PHP foreach 循环更有效地完成，但我尝试了几天但没能成功，这可能是因为我对这个概念的理解较弱。
2 回答
Smart猫小萌
TA贡献1911条经验 获得超7个赞
绝对地。看看这个例子:)
<?php declare(strict_types=1);
interface CacheNormalizer
{
public function normalize(string $text): string;
}
interface PlanDomainToCache
{
public function buildUrl(Plan $plan): string;
}
final class CachedRemoteSiteManager
{
/** @var int Time To Live Cache */
private $timeToLive;
/** @var CacheNormalizer */
private $cacheNormalizer;
/** @var PlanDomainToCache */
private $planDomainToCache;
public function __construct(
int $timeToLive,
CacheNormalizer $cacheNormalizer,
PlanDomainToCache $planDomainToCache
) {
$this->timeToLive = $timeToLive;
$this->cacheNormalizer = $cacheNormalizer;
$this->planDomainToCache = $planDomainToCache;
}
public function updateIfNecessary(Plan $plan): void
{
if ($this->shouldCreateOrUpdateCache($plan)) {
$this->createOrUpdateCache($plan);
}
}
private function shouldCreateOrUpdateCache(Plan $plan): bool
{
return !file_exists($plan->cacheDirectory())
|| time() - filemtime($plan->cacheDirectory()) > $this->timeToLive;
}
private function createOrUpdateCache(Plan $plan): void
{
$urlToCache = $this->planDomainToCache->buildUrl($plan);
$textToCache = file_get_contents($urlToCache);
file_put_contents(
$plan->cacheDirectory(),
$this->cacheNormalizer->normalize($textToCache)
);
}
}
final class Plan
{
/** @var string */
private $cacheDirectory;
/** @var int */
private $product;
/** @var int */
private $currency;
public function __construct(string $cacheDir, int $product, int $currency)
{
$this->cacheDirectory = $cacheDir;
$this->product = $product;
$this->currency = $currency;
}
public function cacheDirectory(): string
{
return $this->cacheDirectory;
}
public function product(): int
{
return $this->product;
}
public function currency(): int
{
return $this->currency;
}
}
// Usage example:
$cacheDirectory = $_SERVER['DOCUMENT_ROOT'] . '/cache/';
$productA = 10;
$productB = 20;
$USD = 1;
$EUR = 2;
/** @var Plan[] */
$plansToCache = [
new Plan($cacheDirectory . 'SM_US.cache', $productA, $USD),
new Plan($cacheDirectory . 'LG_US.cache', $productB, $USD),
new Plan($cacheDirectory . 'SM_EU.cache', $productA, $EUR),
new Plan($cacheDirectory . 'LG_EU.cache', $productB, $EUR),
];
$cacheManager = new CachedRemoteSiteManager(
$cacheTtl = 1600,
new class implements CacheNormalizer {
public function normalize(string $text): string
{
return substr($text, 17, 2);
}
},
new class implements PlanDomainToCache {
public function buildUrl(Plan $plan): string
{
return sprintf(
'https://remotedomain.com/?get=price&product=%d¤cy=%d',
$plan->product(),
$plan->currency()
);
}
}
);
foreach ($plansToCache as $plan) {
$cacheManager->updateIfNecessary($plan);
}
正如您在底部看到的，在“使用示例”中，我提取了所有细节（几乎所有细节），因此我们可以轻松定义：
我们要如何规范化缓存数据（使用 CacheNormalizer）
我们要如何构建要缓存的 URL（使用 PlanDomainToCache）。
更新：
如果您想了解如何从结束代码中提取/解耦每个细节，即使对于“持久性”层也向上反转依赖关系：https ://gist.github.com/Chemaclass/01d3f42685ff69f6897192202a32014d
ITMISS
TA贡献1871条经验 获得超8个赞
如果我正确地解释了代码，您想要查找两种货币的两种产品。这可以在您定义产品和货币后使用嵌套的 foreach 循环来完成。
$cacheDirectory = $_SERVER['DOCUMENT_ROOT'] . '/cache/';
$url = 'https://remotedomain.com/?get=price';
const MAX_CACHE_TIME = 1600;
// Optional
$output = [];
$productList = [
[
'id' => 10,
'name' => 'SM',
],
[
'id' => 20,
'name' => 'LG',
]
];
$currencies = [
'US' => 1,
'EU' => 2,
];
foreach ($productList as $product) {
foreach ($currencies as $currencyName => $currencyId) {
$cacheFile = $cacheDirectory . $product['name'] . '_' . $currencyName . '.cache';
if (!file_exists($cacheFile) || filemtime($cacheFile) > MAX_CACHE_TIME) {
// No cache or too old
$data = file_get_contents($url . '&product=' . $product['id'] . '¤cy=' . $currencyId);
$relevantData = substr($data, 17, 2);
file_put_contents($cacheFile, $relevantData);
// Optional, put the data in an array
$output[$product['id']][$currencyId] = $relevantData;
} else {
$output[$product['id']][$currencyId] = file_get_contents($cacheFile);
}
}
}
// Read outputwith $output[10]['US'] for example
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