7 methods override CacheBackendInterface::garbageCollection()

ApcuBackend::garbageCollection in core/lib/Drupal/Core/Cache/ApcuBackend.php
Performs garbage collection on a cache bin.
BackendChain::garbageCollection in core/lib/Drupal/Core/Cache/BackendChain.php
Performs garbage collection on a cache bin.
ChainedFastBackend::garbageCollection in core/lib/Drupal/Core/Cache/ChainedFastBackend.php
Performs garbage collection on a cache bin.
DatabaseBackend::garbageCollection in core/lib/Drupal/Core/Cache/DatabaseBackend.php
Performs garbage collection on a cache bin.
MemoryBackend::garbageCollection in core/lib/Drupal/Core/Cache/MemoryBackend.php
Performs garbage collection on a cache bin.
NullBackend::garbageCollection in core/lib/Drupal/Core/Cache/NullBackend.php
Performs garbage collection on a cache bin.
PhpBackend::garbageCollection in core/lib/Drupal/Core/Cache/PhpBackend.php
Performs garbage collection on a cache bin.

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