我对仅在某些条件下发生的 PHP 7 的instanceof语句有疑问。
似乎instanceof在我的开发机器（运行 PHP 7.0.13 的 MAMP Pro）上本地工作，但不在我的托管服务器（HostEurope，PHP 7）上。
我尝试了以下方法：
- 降级到 PHP 5.6
- 改用is_a _
- 使用完全限定名称，例如 \Site\Ad
但它们都表现出相同的行为。
我试过谷歌搜索“PHP instanceof not working”和它的变体，但我没有找到任何相关的东西。
我想知道是否有人经历过类似或可能的解决方案来尝试？
有问题的代码是：
<?php
namespace Site;
require_once(__DIR__."/../interface/IOutput.php");
require_once(__DIR__."/../lib/Lib.php");
require_once(__DIR__."/../site/AdMediumRectangle.php");
require_once(__DIR__."/../site/AdSnapBanner.php");
require_once(__DIR__."/../const/Const.php");
class AdFactory
{
/**
* Define(AD_BANNER, 0);
* Define(AD_RECTANGE, 1);
* Define(AD_SUPERBANNER, 2);
* Define(AD_SKYSCRAPER, 3);
**/
/**
* @param $object
* @return AdMediumRectangle|AdSnapBanner|string
*/
public static function CreateObject($object)
{
$ad = wire(pages)->get("/ads/")->children->getRandom();
if ($ad == null)
return new \Exception("No Random Ad found");
switch ($object) {
case AD_BANNER:
echo "AD_Banner Selected\r\n";
$adSnapBanner = new AdSnapBanner($ad);
return $adSnapBanner;
break;
case AD_RECTANGLE:
echo "AD Rectangle Created\r\n";
$adRectangle = new AdMediumRectangle($ad);
return $adRectangle;
break;
case AD_SUPERBANNER:
case AD_SKYSCRAPER:
default:
echo "AdFactory BlankObject created";
return "";
break;
}
}
public static function Markup($object)
{
$obj = AdFactory::CreateObject($object);
if (($obj instanceof AdSnapBanner) || ($obj instanceof AdMediumRectangle)) {
echo "InstanceOf worked";
return $obj->Markup();
}
else {
echo "return blankString";
return "";
}
}
}
更新：这是调用上述 AdFactory 类的代码
<?php
namespace Site;
require_once(__DIR__."/../interface/IOutput.php");
require_once(__DIR__."/../lib/Lib.php");
require_once(__DIR__."/../factory/AdFactory.php");
require_once (__DIR__."/../const/Const.php");
class AdInjector
{
public static function Inject($page, $ad_pos)
{
//Select an Ad from /Ads/ according to criteria
//$ads = wire(pages)->get("/ads/")->children;
$count = 1; //$ads->count();
if ($count > 0) {
$mod = $page->id % 3;
echo "mod=" . $mod . "\r\n";
if ($mod == $ad_pos) {
switch ($mod) {
case AD_POS_TITLE;
case AD_POS_BANNER:
//Pick an Snap Banner
echo "Banner Injected (banner):" . AD_BANNER . "\r\n";
return AdFactory::Markup(AD_BANNER);
break;
case AD_POS_SIBLINGS:
echo "Banner Injected (rect):" . AD_RECTANGLE . "\r\n";
//Pick an Ad Rectangle
return AdFactory::Markup(AD_RECTANGLE);
break;
default:
return "";
break;
}
} else
return "";
} else
return "";
}
}