protected DatabaseBackend::normalizeCid($cid)
Normalizes a cache ID in order to comply with database limitations.
Parameters
string $cid: The passed in cache ID.
Return value
string An ASCII-encoded cache ID that is at most 255 characters long.
File
- core/lib/Drupal/Core/Cache/DatabaseBackend.php, line 403
Class
- DatabaseBackend
- Defines a default cache implementation.
Namespace
Drupal\Core\Cache
Code
protected function normalizeCid($cid) {
// Nothing to do if the ID is a US ASCII string of 255 characters or less.
$cid_is_ascii = mb_check_encoding($cid, 'ASCII');
if (strlen($cid) <= 255 && $cid_is_ascii) {
return $cid;
}
// Return a string that uses as much as possible of the original cache ID
// with the hash appended.
$hash = Crypt::hashBase64($cid);
if (!$cid_is_ascii) {
return $hash;
}
return substr($cid, 0, 255 - strlen($hash)) . $hash;
}
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