2024-05-06 20:40:05 +00:00
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---
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2024-10-29 18:27:12 +00:00
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date: 2020-11-09
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2024-05-06 20:40:05 +00:00
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id: 676f2820-f539-4b0a-8633-668fd0630c3c
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title: Lazy Sessions
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---
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# Introduction
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PHP 7.0 introduced a new interface called
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`SessionUpdateTimestampHandlerInterface`. As of [Symfony
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4.0](20201109140137-symfony_4_0) this has been added to the [PHP7
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Polyfill component](20201109151215-symfony_php7_polyfill_component)
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# Syntax
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``` php
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interface SessionUpdateTimestampHandlerInterface
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{
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// Checks if a session identifier already exists or not.
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public function validateId(string $key) : bool;
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// Updates the timestamp of a session when its data didn't change.
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public function updateTimestamp(string $key, string $val) : bool;
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}
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```
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