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3849004fcc
Fixes #20371 Both blocks are currently rendered identically. Keeping only one of the two makes it easier to contribute. Some blocks were elevated to danger.
65 lines
2.3 KiB
ReStructuredText
65 lines
2.3 KiB
ReStructuredText
PHP Files Cache Adapter
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=======================
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Similarly to :doc:`Filesystem Adapter </components/cache/adapters/filesystem_adapter>`, this cache
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implementation writes cache entries out to disk, but unlike the Filesystem cache adapter,
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the PHP Files cache adapter writes and reads back these cache files *as native PHP code*.
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For example, caching the value ``['my', 'cached', 'array']`` will write out a cache
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file similar to the following::
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<?php return [
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// the cache item expiration
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0 => 9223372036854775807,
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// the cache item contents
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1 => [
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0 => 'my',
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1 => 'cached',
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2 => 'array',
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],
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];
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.. note::
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This adapter requires turning on the ``opcache.enable`` php.ini setting.
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As cache items are included and parsed as native PHP code and due to the way `OPcache`_
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handles file includes, this adapter has the potential to be much faster than other
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filesystem-based caches.
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.. warning::
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While it supports updates and because it is using OPcache as a backend, this adapter is
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better suited for append-mostly needs. Using it in other scenarios might lead to
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periodical reset of the OPcache memory, potentially leading to degraded performance.
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The PhpFilesAdapter can optionally be provided a namespace, default cache lifetime, and cache
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directory path as constructor arguments::
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use Symfony\Component\Cache\Adapter\PhpFilesAdapter;
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$cache = new PhpFilesAdapter(
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// a string used as the subdirectory of the root cache directory, where cache
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// items will be stored
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$namespace = '',
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// the default lifetime (in seconds) for cache items that do not define their
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// own lifetime, with a value 0 causing items to be stored indefinitely (i.e.
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// until the files are deleted)
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$defaultLifetime = 0,
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// the main cache directory (the application needs read-write permissions on it)
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// if none is specified, a directory is created inside the system temporary directory
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$directory = null
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);
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.. note::
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This adapter implements :class:`Symfony\\Component\\Cache\\PruneableInterface`,
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allowing for manual :ref:`pruning of expired cache entries <component-cache-cache-pool-prune>` by
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calling its ``prune()`` method.
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.. _`OPcache`: https://www.php.net/manual/en/book.opcache.php
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