WordPress Developer Resources

apply_filters( ‘wp_admin_notice_markup’, string $markup, string $message, array $args )

Filters the markup for an admin notice.

Parameters

$markupstring: The HTML markup for the admin notice.
$messagestring: The message for the admin notice.
$argsarray: The arguments for the admin notice.

Source

$classes .= ' ' . implode( ' ', $args['additional_classes'] );

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Changelog

Version	Description
6.4.0	Introduced.

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