com_create_guid

(PHP 5, PHP 7)

com_create_guidGénère un identifiant unique global (GUID)

Description

com_create_guid ( void ) : string

Génère un identifiant unique global (GUID).

Un GUID est généré de la même façon que DCE UUID, excepté le fait que la convention Microsoft inclut le GUID dans une parenthèse.

Valeurs de retour

Retourne le GUID, sous la forme d'une chaîne de caractères.

Voir aussi

  • uuid_create() dans l'extension PECL uuid

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User Contributed Notes 5 notes

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29
Alix Axel
9 years ago
The phunction PHP framework (http://sourceforge.net/projects/phunction/) uses the following function to generate valid version 4 UUIDs:

<?php

function GUID()
{
    if (
function_exists('com_create_guid') === true)
    {
        return
trim(com_create_guid(), '{}');
    }

    return
sprintf('%04X%04X-%04X-%04X-%04X-%04X%04X%04X', mt_rand(0, 65535), mt_rand(0, 65535), mt_rand(0, 65535), mt_rand(16384, 20479), mt_rand(32768, 49151), mt_rand(0, 65535), mt_rand(0, 65535), mt_rand(0, 65535));
}

?>

The output generated by the sprintf() and mt_rand() calls is identical to com_create_guid() results.
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26
pavel.volyntsev(at)gmail
4 years ago
Use more cryptographically strong algorithm to generate pseudo-random bytes and format it as GUID v4 string

function guidv4()
{
    if (function_exists('com_create_guid') === true)
        return trim(com_create_guid(), '{}');

    $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));
}
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18
Dave Pearson (dave at pds-uk dot com)
3 years ago
Here's my final version of a GUIDv4 function (based on others work here) that should work on all platforms and gracefully fallback to less cryptographically secure version if others are not supported...

<?php
/**
* Returns a GUIDv4 string
*
* Uses the best cryptographically secure method
* for all supported pltforms with fallback to an older,
* less secure version.
*
* @param bool $trim
* @return string
*/
function GUIDv4 ($trim = true)
{
   
// Windows
   
if (function_exists('com_create_guid') === true) {
        if (
$trim === true)
            return
trim(com_create_guid(), '{}');
        else
            return
com_create_guid();
    }

   
// 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($charid08).$hyphen.
             
substr($charid84).$hyphen.
             
substr($charid, 124).$hyphen.
             
substr($charid, 164).$hyphen.
             
substr($charid, 20, 12).
             
$rbrace;
    return
$guidv4;
}
?>
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8
indrora
4 years ago
If you're going to generate random UUIDs, at least make them conform:

* The uppermost byte of the third stanza must be 4
* the uppermost byte of the fourth stanza may be any of (8 9 a b)

see also: The wikipedia page for UUIDs: https://en.wikipedia.org/wiki/Universally_unique_identifier#Version_4_.28random.29
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-1
rogervila dot es
2 months ago
I implemented a com_create_guid implementation for systems that do not support it as a Composer package in order to keep it separated from my applications

https://github.com/rogervila/com_create_guid
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