Called when closing the filter

# php_user_filter::onClose

(PHP 5, PHP 7, PHP 8)

php_user_filter::onClose — Called when closing the filter

### Description

public php_user_filter::onClose(): void

This method is called upon filter shutdown (typically, this is also during stream shutdown), and is executed after the `flush` method is called. If any resources were allocated or initialized during `onCreate()` this would be the time to destroy or dispose of them.

### Parameters

This function has no parameters.

### Return Values

Return value is ignored.

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