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Switch to generating UUID4 components with wp_rand() #10694

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johnbillion wants to merge 4 commits into from
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Switch to generating UUID4 components with wp_rand() #10694

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ebe961b
Switch to generating UUID4 components with `wp_rand()`, which is usua…
johnbillion Jan 8, 2026
f02aa6d
Only use wp_rand if the function exists.
aaronjorbin Mar 18, 2026
909b2ab
Merge branch 'trunk' into 59239-wp_generate_uuid4
peterwilsoncc Mar 18, 2026
6f59851
Try falling back to random_int and only if it is not available, fallb…
aaronjorbin Mar 19, 2026
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30 changes: 22 additions & 8 deletions src/wp-includes/functions.php
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Original file line number Diff line number Diff line change
Expand Up @@ -7990,20 +7990,34 @@ function wp_raise_memory_limit( $context = 'admin' ) {
* Generates a random UUID (version 4).
*
* @since 4.7.0
* @since 7.0.0 Uses wp_rand if available.
*
* @return string UUID.
*/
function wp_generate_uuid4() {
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static $backup_randomizer = false;
$randomizer = function_exists( 'wp_rand' ) ? 'wp_rand' : $backup_randomizer;

if ( false === $randomizer ) {
try {
random_int( 0, 15705 );
$backup_randomizer = 'random_int';
} catch ( Exception $e ) {
$backup_randomizer = 'mt_rand';
}
$randomizer = $backup_randomizer;
}

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 )
$randomizer( 0, 0xffff ),
$randomizer( 0, 0xffff ),
$randomizer( 0, 0xffff ),
$randomizer( 0, 0x0fff ) | 0x4000,
$randomizer( 0, 0x3fff ) | 0x8000,
$randomizer( 0, 0xffff ),
$randomizer( 0, 0xffff ),
$randomizer( 0, 0xffff )
);
}

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