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48 lines
1.1 KiB
Markdown
48 lines
1.1 KiB
Markdown
---
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title: Caching
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summary: Reduce rendering time with cached templates and understand the limitations of the ViewableData object caching.
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icon: rocket
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---
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# Caching
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## Object caching
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All functions that provide data to templates must have no side effects, as the value is cached after first access. For
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example, this controller method will not behave as you might imagine.
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```php
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private $counter = 0;
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public function Counter()
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{
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$this->counter += 1;
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return $this->counter;
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}
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```
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```ss
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$Counter, $Counter, $Counter
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// returns 1, 1, 1
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```
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When we render `$Counter` to the template we would expect the value to increase and output `1, 2, 3`. However, as
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`$Counter` is cached at the first access, the value of `1` is saved.
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## Partial caching
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Partial caching is a feature that allows the caching of just a portion of a page. Instead of fetching the required data
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from the database to display, the contents of the area are fetched from a [cache backend](../performance/caching).
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```ss
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<% cached 'MyCachedContent', LastEdited %>
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$Title
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<% end_cached %>
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```
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