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<?php |
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namespace IsoCodes; |
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/** |
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* Class Imei for International Mobile Equipment Identity (IMEI) |
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* IMEI is a number, usually unique, |
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* to identify 3GPP and iDEN mobile phones, as well as some satellite phones. |
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* |
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* The IMEI (15 decimal digits: 14 digits plus a check digit) |
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* or IMEISV (16 decimal digits: 14 digits plus two software version digits) |
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* includes information on the origin, model, and serial number of the device. |
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* |
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* As of 2004, the format of the IMEI is AA-BBBBBB-CCCCCC-D, |
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* although it may not always be displayed this way. |
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* |
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* The IMEISV does not have the Luhn check digit |
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* but instead has two digits for the Software Version Number (SVN), making the format AA-BBBBBB-CCCCCC-EE |
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* |
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* @see https://en.wikipedia.org/wiki/International_Mobile_Equipment_Identity |
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*/ |
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class Imei implements IsoCodeInterface |
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{ |
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const HYPHENS = ['‐', '-', ' ']; // regular dash, authentic hyphen (rare!) and space |
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/** |
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* @param mixed $imei |
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* |
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* @return bool |
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*/ |
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public static function validate($imei) |
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{ |
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$imei = Utils::unDecorate($imei, self::HYPHENS); |
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$length = 15; // for EMEI only, IMEISV is +1 |
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$divider = 10; |
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$weight = 2; |
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$sum = 0; |
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// IMEISV? |
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if ($length + 1 === strlen($imei)) { |
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$expr = sprintf('/\\d{%d}/i', $length + 1); |
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if (preg_match($expr, $imei)) { |
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return true; |
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} |
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return false; |
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} |
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// IMEI? |
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$body = substr($imei, 0, $length - 1); |
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$check = substr($imei, $length - 1, 1); |
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$expr = sprintf('/\\d{%d}/i', $length); |
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if (!preg_match($expr, $imei)) { |
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return false; |
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} |
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if (0 === (int) $imei) { |
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return false; |
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} |
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for ($i = 0; $i < strlen($body); ++$i) { |
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if (0 === $i % 2) { |
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$add = (int) substr($body, $i, 1); |
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$sum += $add; |
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} else { |
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$add = $weight * (int) substr($body, $i, 1); |
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if (10 <= $add) { // '18' = 1+8 = 9, etc. |
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$strAdd = strval($add); |
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$add = intval($strAdd[0]) + intval($strAdd[1]); |
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} |
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$sum += $add; |
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} |
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} |
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return 0 === ($sum + $check) % $divider; |
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} |
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} |
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ronanguilloux /
IsoCodes
