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Kévin Dunglas

Founder of Les-Tilleuls.coop (worker-owned cooperative). Creator of API Platform, Mercure.rocks, Vulcain.rocks and of some Symfony components.

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Tag: domain name

PHP 7: Introducing a domain name validator and making the URL validator stricter

Posted on November 28, 2014November 28, 2014 by Kévin Dunglas

DNS comes with a set of rules defining valid domain names. A domain name cannot exceed 255 octets (RFC 1034) and each label cannot exceed 63 octets (RFC 1035). It can contain any character (RFC 2181) but extra rules apply for hostnames (A and MX records, data of SOA and NS records): only alphanumeric ASCII characters and hyphens are allowed in labels…

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