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com_create_guid

(PHP 5, PHP 7, PHP 8)

com_create_guidGenerar un identificador único globalmente (GUID)

Descripción

com_create_guid(): string

Genera un identificador único globalmente (GUID: Globally Unique Identifier).

Un GUID es generado de la misma manera que el DCE UUID, excepto que la convención de Microsoft encierra un GUID entre llaves.

Valores devueltos

Devuelve el GUID como cadena.

Ver también

  • uuid_create() en la extensión uuid de PECL

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User Contributed Notes 6 notes

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26
Dave Pearson (dave at pds-uk dot com)
6 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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38
Alix Axel
11 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
6 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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8
indrora
6 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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5
internmail (at the google mail).com
2 years ago
function create_guid() { // Create GUID (Globally Unique Identifier)
        $guid = '';
        $namespace = rand(11111, 99999);
        $uid = uniqid('', true);
        $data = $namespace;
        $data .= $_SERVER['REQUEST_TIME'];
        $data .= $_SERVER['HTTP_USER_AGENT'];
        $data .= $_SERVER['REMOTE_ADDR'];
        $data .= $_SERVER['REMOTE_PORT'];
        $hash = strtoupper(hash('ripemd128', $uid . $guid . md5($data)));
        $guid = substr($hash,  0,  8) . '-' .
                substr($hash,  8,  4) . '-' .
                substr($hash, 12,  4) . '-' .
                substr($hash, 16,  4) . '-' .
                substr($hash, 20, 12);
        return $guid;
    }
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-8
rogervila dot es
2 years 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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