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<?php

$referer = 'http://chameleon.online.dev/documents/orders/';

// Извлекаем имя хоста из URL
//preg_match('@^(^http://[.*]/)?(.*)@i',
//    $referer, $matches);

preg_match('@^(?:http://)?([^/]+)@i',
    $referer, $matches);

$host = $matches;

var_dump($host);

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Output
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Output for 4.3.0 - 7.2.0: array(2) { [0]=> string(27) "http://chameleon.online.dev" [1]=> string(20) "chameleon.online.dev" }