25 lines
749 B
PHP
25 lines
749 B
PHP
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<?php
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namespace App\Support;
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/**
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* Naive "last two labels" root-domain heuristic — good enough for the common case
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* (example.com, somesite.es) but wrong for real-world two-part public suffixes like
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* .co.uk or .com.au, where it would treat "co.uk" as the root instead of
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* "example.co.uk". Doing that correctly means integrating the Mozilla Public Suffix
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* List; this is a deliberate simplification until that's worth the added complexity.
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*/
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class RootDomain
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{
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public static function of(string $domain): string
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{
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$labels = explode('.', strtolower(trim($domain, '.')));
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if (count($labels) <= 2) {
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return implode('.', $labels);
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}
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return implode('.', array_slice($labels, -2));
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}
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}
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