完全验证带有或不带有http或https的URL [英] Completely validate URL with or without http or https

问题描述

我已经对PHP中的URL验证进行了一些研究，发现StackOverflow上存在许多不同的答案，其中一些比其他答案要好，而另一些则已经过时了.

I've done some researching on validating URLs in PHP and found that there are many different answers on StackOverflow, some better than others, and some very old and outdated.

我有一个用户可以在其中输入其网站网址的字段.用户应该能够以任何形式输入URL，例如:

I have a field where users can input their website's url. The user should be able to enter the URL in any form, for example:

example.com
www.example.com
http://example.com
http://www.example.com
https://example.com
https://www.example.com

PHP附带了用于验证URL的函数，但是，如果没有http://，则会将该网址标记为无效.

PHP comes with a function to validate URLs, however, it marks the URL as invalid if it doesn't have http://.

我如何验证带有或不带有http://或https://的任何种类的URL，以确保URL有效?

How can I validate any sort of URL, with or without http:// or https://, that would ensure the URL is valid?

谢谢.

推荐答案

使用您所说的filter_var()，但是根据定义，URL必须包含一个协议.仅使用http也会检查https:

Use filter_var() as you stated, however, by definition a URL must contain a protocol. Using just http will check for https as well:

$url = strpos($url, 'http') !== 0 ? "http://$url" : $url;

然后:

if(filter_var($url, FILTER_VALIDATE_URL)) {
    //valid
} else {
    //not valid
}

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