wp_generate_uuid4()
Generates an identifier - a random unique string consisting of letters and numbers. Creates UUID (Universally unique identifier) version 4.
It works based on 8 functions mt_rand() and has the format %04x%04x-%04x-%04x-%04x-%04x%04x%04x%04x - consists of 5 parts:
- Part 1 consists of 8 characters.
- 2,3,4 parts consist of 4 characters each, all different.
- Part 5 consists of 12 characters.
For example:
4c585b5e-5220-4b1d-92e2-316f88210482
UUID explanation
A UUID represents a 128-bit value (16 bytes): It contains four 4-byte digits that are represented in hex notation, and are segmented by 4 - symbols. The total length is 36 characters.
The - symbols appear after byte 4, byte 6, byte 8 and after byte 10.
Because it’s a hex-value, a UUID should be treated in a case-insensitive manner:
11223344-5566-7788-99AA-BBCCDDEEFF00 is identical to 11223344-5566-7788-99aa-bbccddeeff00.
This function always returns a lower-case string.
To get a 32-character string (same as MD5) you could use:
$uuid36 = wp_generate_uuid4(); // a938e855-483e-48c7-9b98-f41e90511f77 $uuid32 = str_replace( '-', '', $uuid36 ); // a938e855483e48c79b98f41e90511f77
Use wp_is_uuid(), to check if a string is a UUID code.
Use the standard PHP function uniqid() if you want a simplified version of the UUID.
No Hooks.
Return
String. UUID.
Usage
wp_generate_uuid4();
Examples
#1 Create and display the UUID [auto-translate]
echo wp_generate_uuid4(); //> 9d9c81fc-4233-4b6e-98aa-b553d7d200ab
Changelog
| Since 4.7.0 | Introduced. |
wp_generate_uuid4() wp generate uuid4 code WP 6.1.1
function wp_generate_uuid4() {
return sprintf(
'%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
mt_rand( 0, 0xffff ),
mt_rand( 0, 0xffff ),
mt_rand( 0, 0xffff ),
mt_rand( 0, 0x0fff ) | 0x4000,
mt_rand( 0, 0x3fff ) | 0x8000,
mt_rand( 0, 0xffff ),
mt_rand( 0, 0xffff ),
mt_rand( 0, 0xffff )
);
}