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<?php
/**
 * TLDSupport: Support package for TLDDatabase and TLDExtract.
 *
 * @link      https://github.com/layershifter/TLDSupport
 *
 * @copyright Copyright (c) 2016, Alexander Fedyashov
 * @license   https://raw.githubusercontent.com/layershifter/TLDSupport/master/LICENSE Apache 2.0 License
 */

namespace LayerShifter\TLDSupport\Helpers;

/**
 * Helper class for work with IP addresses.
 */
class IP
{

    /**
     * Check if the input is a valid IP address. Recognizes both IPv4 and IPv6 addresses.
     *
     * @param string $hostname Hostname that will be checked
     *
     * @return boolean
     */
    public static function isValid($hostname)
    {
        $hostname = trim($hostname);

        // Strip the wrapping square brackets from IPv6 addresses.

        if (Str::startsWith($hostname, '[') && Str::endsWith($hostname, ']')) {
            $hostname = substr($hostname, 1, -1);
        }

        return (bool)filter_var($hostname, FILTER_VALIDATE_IP);
    }
}