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1 <?php
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2
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3 namespace Sabre\VObject;
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4
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5 /**
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6 * UUID Utility
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7 *
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8 * This class has static methods to generate and validate UUID's.
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9 * UUIDs are used a decent amount within various *DAV standards, so it made
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10 * sense to include it.
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11 *
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12 * @copyright Copyright (C) 2011-2015 fruux GmbH (https://fruux.com/).
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13 * @author Evert Pot (http://evertpot.com/)
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14 * @license http://sabre.io/license/ Modified BSD License
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15 */
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16 class UUIDUtil {
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17
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18 /**
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19 * Returns a pseudo-random v4 UUID
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20 *
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21 * This function is based on a comment by Andrew Moore on php.net
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22 *
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23 * @see http://www.php.net/manual/en/function.uniqid.php#94959
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24 * @return string
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25 */
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26 static public function getUUID() {
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27
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28 return sprintf(
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29
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30 '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
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31
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32 // 32 bits for "time_low"
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33 mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),
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34
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35 // 16 bits for "time_mid"
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36 mt_rand( 0, 0xffff ),
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37
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38 // 16 bits for "time_hi_and_version",
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39 // four most significant bits holds version number 4
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40 mt_rand( 0, 0x0fff ) | 0x4000,
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41
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42 // 16 bits, 8 bits for "clk_seq_hi_res",
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43 // 8 bits for "clk_seq_low",
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44 // two most significant bits holds zero and one for variant DCE1.1
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45 mt_rand( 0, 0x3fff ) | 0x8000,
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46
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47 // 48 bits for "node"
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48 mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
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49 );
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50 }
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51
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52 /**
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53 * Checks if a string is a valid UUID.
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54 *
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55 * @param string $uuid
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56 * @return bool
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57 */
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58 static public function validateUUID($uuid) {
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59
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60 return preg_match(
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61 '/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i',
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62 $uuid
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63 ) == true;
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64
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65 }
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66
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67 }
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