$this->srvsByBucket = array_filter( $config['srvsByBucket'], 'is_array' );
$this->srvsByBucket = array_values( $this->srvsByBucket ); // consecutive
- $memcConfig = isset( $config['memcConfig'] ) ? $config['memcConfig'] : [];
+ $memcConfig = $config['memcConfig'] ?? [];
$memcConfig += [ 'class' => MemcachedPhpBagOStuff::class ]; // default
$class = $memcConfig['class'];