How do I check if a URL is exists in PHP, without following redirects?
我怎么检查是否存在一个URL在PHP中，没有重定向之后吗？
If this option is enabled the program will connect to the server each time and notify you when the new version will be available if one is exists.
如果启用该选项，程序将连接到服务器，并通知你每次当新版本将于如果一个人存在。
There were various views about what constitutes it, but there was agreement that such an essence exists—that is to say, that there is something by virtue of which man is man.
关于它是由什么构成的，人们有各种不同的看法，但大家一致认为，有这样一种本质是存在的，也就是说，有一种东西可以作为人就是人的依据。
In a sense this is inescapable: meaning exists only insofar as it means to someone, and literary works are written in order to evoke sets of responses in the reader.
从某种意义上说，这是不可避免的：意义只存在于对某人有意义的地方，而文学作品是为了唤起读者的反应而写的。
The only difference that exists between them is that they lack skills in establishing good relationships with their children.
他们之间存在的唯一区别是他们缺乏与孩子建立良好关系的技巧。
This is because he believes that the soul exists, will continue to exist after the death of the body, and the soul is immortal.
这是因为他认为灵魂是存在的，在肉体死后仍会继续存在，而且灵魂是不朽的。
The greatest problem in using intelligence tests for the purpose of prediction is that no dependable criterion of their accuracy exists.
用智力测试来预测的最大问题是没有可靠的标准来衡量它们的准确性。
Presently, no objective test for whiplash exists, so it is true that spurious reports of whiplash injuries cannot be readily identified.
目前，对颈椎病还没有客观的检测方法，所以确实不能轻易辨别颈椎伤的虚假报告。
To live in the United States today is to gain an appreciation for Dahrendorf's assertion that social change exists everywhere.
今天生活在美国，是对达伦多夫关于社会变革无处不在的主张的赞赏。
Though much research exists on adolescents and screen use, this is considered as the first tool to measure how addicted children are to screen media.
尽管已经有过很多关于青少年和电子屏使用的研究了，这个方法还是被视为第一个用来衡量孩子对屏幕媒介上瘾程度的工具。
There is evidence that microheterogeneity exists within the SAA species.
有证据证明在 SAA 类型中存在微观不均一性。
In the immense and vast global biosphere, there exists a kind of noteless melanocratic organic matter which is humic substances.
在浩瀚广袤的地球生物圈里，蕴藏着一种不引人注目的暗色有机物，这就是腐植酸类物质。
What matters is whether he exists for you or for me.
重要的是他对你我来说是否存在。
Scientists are still arguing over what it is and whether it exists at all.
科学家们还在争论着它是什么以及它究竟是否存在这样的问题。
God is everything that exists, everything - and that is beyond our ability to comprehend at all.
上帝是存在的一切的一切——这完全超出了我们的理解。
One reason people deny that altruism exists is that, looking inward, they doubt the purity of their own motives.
人们否认利他主义存在的一个原因是，在自省时，他们质疑自己动机的纯洁性。
Yet the reality is that the cowboy still exists because his work is essential to the industry.
事实上，真实的是牛仔们仍然存在，因为他们的工作对于这个产业来说是最基本的需要。
The assumption is that a configuration exists for each model and version.
这里假设每个模型和版本都存在相应的配置。
And in fact, hazing through cognitive dissonance draws the inference that this is really, really valuable and this is why it exists.
事实上，根据认识失调来运用欺负新人这个手段得出一个结论,这个理论非常有价值，这就是为什么它会存在。
Ensure the connection GSDB exists and is in the connected state.
确保存在连接GSDB，并且它处于已连接状态。
At the moment, the main reason for believing dark matter exists is that spinning galaxies would fly apart without it.
目前，确信暗物质存在的主要依据是基于一个事实：自旋星系如果没有暗物质将四处飞散。
If the queue already exists, its handle is returned.
如果队列已经存在，返回其句柄。
Thirdly, there is absolutely no e-mail tracing software that currently exists so it is absolutely impossible for this to be true.
第三，目前绝对不存在什么电子邮件跟踪软件，所以这个流言很显然不可能是真的。
Be careful to ensure that where process documentation exists, it is actually being followed.
请仔细确定过程文献存在的位置，稍后将会使用到它。
As you can see, F4 (if it exists) is constant, and hence trivially predictable.
正如您所看到的，F4(如果它存在的话)是常量，因此可以进行琐碎的预测。
Simon (1947) concludes that the assumption so often made in organizational studies, that an arrangement is effective because it exists, is a circular argument of the worst sort.
Simon（1947）认定在组织研究中如此频繁地做出某一种安排存在即有效的假设，是一种最恶劣的循环论证。
It is a complete understanding of the universe, why it is as it is and why it exists at all.
它是一个对宇宙的完整理解，为什么它是这样的和为什么它存在着，仅此而已。
Do you believe it really exists, or is this just something that needs to be looked at further?
你相信它真的存在吗，还是这只是一些需要进一步研究的事？
The most startling thing about Super Mario Galaxy 2, then, is that it exists at all.
关于《超级马里奥银河2》最令人吃惊的事情，就是，它真的出现了。
The most startling thing about Super Mario Galaxy 2, then, is that it exists at all.
关于《超级马里奥银河2》最令人吃惊的事情，就是，它真的出现了。
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