(PHP 5)

com_create_guidGenerate a globally unique identifier (GUID)


string com_create_guid ( void )

Generates a Globally Unique Identifier (GUID).

A GUID is generated in the same way as DCE UUID's, except that the Microsoft convention is to enclose a GUID in curly braces.

Возвращаемые значения

Returns the GUID as a string.

Смотрите также

  • uuid_create() in the PECL uuid extension


A guid function that works in all php versions:

function guid(){
    if (
mt_srand((double)microtime()*10000);//optional for php 4.2.0 and up.
$charid strtoupper(md5(uniqid(rand(), true)));
$hyphen chr(45);// "-"
$uuid chr(123)// "{"
chr(125);// "}"
return $uuid;
2005-04-28 11:16:42
The phunction PHP framework ( uses the following function to generate valid version 4 UUIDs:


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

sprintf('%04X%04X-%04X-%04X-%04X-%04X%04X%04X'mt_rand(065535), mt_rand(065535), mt_rand(065535), mt_rand(1638420479), mt_rand(3276849151), mt_rand(065535), mt_rand(065535), mt_rand(065535));


The output generated by the sprintf() and mt_rand() calls is identical to com_create_guid() results.
2010-08-16 18:59:39
I made a mistake on my previous note.  I used rtrim instead of just trim to take off the curly brackets.  Here is my note again - or please change the RTRIM to just TRIM in my previous note.  Thanks!  :-)

Kristof_Polleunis at yahoo dot com has an excellent function for obtaining a GUID but I believe it can be improved by checking for whether or not to remove the curly braces so the programmer who uses it doesn't have to do this.  Here is the improved function:

#   Taken from the PHP documentation website.
#   Kristof_Polleunis at yahoo dot com
#   A guid function that works in all php versions:
#   MEM 3/30/2015 : Modified the function to allow someone
#       to specify whether or not they want the curly
#       braces on the GUID.
function guid$opt true ){       //  Set to true/false as your default way to do this.

if( function_exists('com_create_guid') ){
$opt ){ return com_create_guid(); }
            else { return 
trimcom_create_guid(), '{}' ); }
        else {
mt_srand( (double)microtime() * 10000 );    // optional for php 4.2.0 and up.
$charid strtouppermd5(uniqid(rand(), true)) );
$hyphen chr45 );    // "-"
$left_curly $opt chr(123) : "";     //  "{"
$right_curly $opt chr(125) : "";    //  "}"
$uuid $left_curly
substr$charid0) . $hyphen
substr$charid8) . $hyphen
substr$charid12) . $hyphen
substr$charid16) . $hyphen
substr$charid2012 )


As the comments say - set the incoming option ($opt) to either TRUE or FALSE depending upon whether you want the curly braces to always show up or not.  If you need to obtain a GUID in the other way - all you have to do is to send the opposite value to the function.
2015-03-30 18:34:10
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));
2015-08-27 15:37:47
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:
2015-11-08 09:09:52
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...

 * 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)
trim(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.
2016-04-14 13:07:19
There is misspell for russian language.

text with misspell:
"GUID генерируется так же как и DCE UUID, за исключением того, что по конвенции Microsoft необходимо заключать GUID в фигурные скоюки." 
right text is:
"GUID генерируется так же как и DCE UUID, за исключением того, что по конвенции Microsoft необходимо заключать GUID в фигурные скобки."
2017-01-09 11:26:18

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