public function Php::generate in Zircon Profile 8.0

Same name and namespace in other branches

1. 8 core/lib/Drupal/Component/Uuid/Php.php \Drupal\Component\Uuid\Php::generate()

Generates a Universally Unique IDentifier (UUID).

Return value

A 16 byte integer represented as a hex string formatted with 4 hyphens.

Overrides UuidInterface::generate

File

core/lib/Drupal/Component/Uuid/Php.php, line 24

Contains \Drupal\Component\Uuid\Php.

Class

Php

Generates a UUID v4 using PHP code.

Namespace

Drupal\Component\Uuid

Code

public function generate() {
  $hex = substr(hash('sha256', Crypt::randomBytes(16)), 0, 32);

  // The field names refer to RFC 4122 section 4.1.2.
  $time_low = substr($hex, 0, 8);
  $time_mid = substr($hex, 8, 4);
  $time_hi_and_version = base_convert(substr($hex, 12, 4), 16, 10);
  $time_hi_and_version &= 0xfff;
  $time_hi_and_version |= 4 << 12;
  $clock_seq_hi_and_reserved = base_convert(substr($hex, 16, 4), 16, 10);
  $clock_seq_hi_and_reserved &= 0x3f;
  $clock_seq_hi_and_reserved |= 0x80;
  $clock_seq_low = substr($hex, 20, 2);
  $nodes = substr($hex, 20);
  $uuid = sprintf('%s-%s-%04x-%02x%02x-%s', $time_low, $time_mid, $time_hi_and_version, $clock_seq_hi_and_reserved, $clock_seq_low, $nodes);
  return $uuid;
}