58 lines
1.6 KiB
PHP
58 lines
1.6 KiB
PHP
<?php
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namespace Faker\Provider;
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class Uuid extends Base
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{
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/**
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* Generate name based md5 UUID (version 3).
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* @example '7e57d004-2b97-0e7a-b45f-5387367791cd'
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*/
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public static function uuid()
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{
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// fix for compatibility with 32bit architecture; seed range restricted to 62bit
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$seed = mt_rand(0, 2147483647) . '#' . mt_rand(0, 2147483647);
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// Hash the seed and convert to a byte array
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$val = md5($seed, true);
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$byte = array_values(unpack('C16', $val));
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// extract fields from byte array
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$tLo = ($byte[0] << 24) | ($byte[1] << 16) | ($byte[2] << 8) | $byte[3];
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$tMi = ($byte[4] << 8) | $byte[5];
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$tHi = ($byte[6] << 8) | $byte[7];
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$csLo = $byte[9];
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$csHi = $byte[8] & 0x3f | (1 << 7);
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// correct byte order for big edian architecture
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if (pack('L', 0x6162797A) == pack('N', 0x6162797A)) {
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$tLo = (($tLo & 0x000000ff) << 24) | (($tLo & 0x0000ff00) << 8)
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| (($tLo & 0x00ff0000) >> 8) | (($tLo & 0xff000000) >> 24);
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$tMi = (($tMi & 0x00ff) << 8) | (($tMi & 0xff00) >> 8);
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$tHi = (($tHi & 0x00ff) << 8) | (($tHi & 0xff00) >> 8);
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}
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// apply version number
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$tHi &= 0x0fff;
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$tHi |= (3 << 12);
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// cast to string
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$uuid = sprintf(
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'%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x',
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$tLo,
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$tMi,
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$tHi,
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$csHi,
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$csLo,
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$byte[10],
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$byte[11],
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$byte[12],
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$byte[13],
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$byte[14],
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$byte[15]
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);
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return $uuid;
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}
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}
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