IpQueryContract::query()
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<?php
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namespace IpInfo;
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abstract class IpQueryContract
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{
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    protected $ip;
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    abstract public function query($ip);
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    /**
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     * @return int
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     */
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    protected function ipCheck()
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    {
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        return preg_match('/^((?:(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))\.){3}(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d))))$/u', $this->ip);
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    }
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}