Validating url php

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This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, Math ML, etc.If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, Mobile OK content, or to find broken links, there are other validators and tools available. Finally, I’d like to recommend this nice collection of filter_var tests dependent on the filter flags. Imagine a dating site where user urls are validated with filter_var and displayed on the front page. The absolutely valid url being rejected: To conclude: use filter_var with care, adapt to your situation and be aware of the weaknesses. Because of the url encoded newline, the javascript comment started with // will be finished and what follows is arbitrary javascript code. The following modification of filter_var could be worth wile: But even with this wrapping function, the – at least very unusual – url passes validation. And before I forget: filter_var is not multibyte capable. After that, the sequence follows, which is exactly the output of the following code: Get it?

This online version enables you use it without installing the client tool on your PC.

There is also a bug in PHP 5.2.13 and PHP 5.3.2 that will not allow URLs with dashes in them to validate.

If you are unsure of your PHP version you can run php -v from the command line if you have command line PHP installed, or create a PHP file with the following contents and navigate to it using your web browser: There is a lot of debate about whether using a regular expression is a good idea when doing URL validation.

More information about HTML Tidy is available from the original W3C page, and you can download a local copy of it from the Source Forge project page.

Please refer to the errata for this document, which may include some normative corrections.

But let’s move on: The double // starts an ordinary javascript comment and convinces filter_var that we are dealing with a valid url scheme – look at the examples above.

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