Validating Domains In Different Ways ?

sunny_pro

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Jun 18, 2017
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Folks,

When a user inputs his domain name (just the domain name. Eg. webmastersun.com) into my form field, I want the form to check if the domain is valid.

1. I don't care if the inserted domain is registered or not. Nor care if it is functional or not. Aslong as it is a valid domain then that should be accepted.

2. This time, I need to make sure the domain is registered and functional.


I am spoilt for choice as too many code samples presented here:

https://stackoverflow.com/questions/1755144/how-to-validate-domain-name-in-php

Which code sample from the above link would you use to satisfy my question number 1 and why particularly that one and not the others ?
And, which one would you use to satisfy my question number 2 and why particularly that one over the others ?
 
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