/**
* 获取全局唯一标识符
* @param bool $trim
* @return string
*/
function getGuidV4($trim = true)
{
// Windows
if (function_exists('com_create_guid') === true) {
$charid = com_create_guid();
return $trim == true ? trim($charid, '{}') : $charid;
}
// OSX/Linux
if (function_exists('openssl_random_pseudo_bytes') === true) {
$data = openssl_random_pseudo_bytes(16);
$data[6] = chr(ord($data[6]) & 0x0f | 0x40); // set version to 0100
$data[8] = chr(ord($data[8]) & 0x3f | 0x80); // set bits 6-7 to 10
return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
}
// Fallback (PHP 4.2+)
mt_srand((double)microtime() * 10000);
$charid = strtolower(md5(uniqid(rand(), true)));
$hyphen = chr(45); // "-"
$lbrace = $trim ? "" : chr(123); // "{"
$rbrace = $trim ? "" : chr(125); // "}"
$guidv4 = $lbrace .
substr($charid, 0, 8) . $hyphen .
substr($charid, 8, 4) . $hyphen .
substr($charid, 12, 4) . $hyphen .
substr($charid, 16, 4) . $hyphen .
substr($charid, 20, 12) .
$rbrace;
return $guidv4;
}
PHP 获取全局唯一标识符
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转载自blog.csdn.net/weixin_40854327/article/details/113184921
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