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apply_filters( ‘kses_allowed_protocols’, string[] $protocols )

Filters the list of protocols allowed in HTML attributes.

Parameters

$protocolsstring[]
Array of allowed protocols e.g. 'http', 'ftp', 'tel', and more.

Source

$protocols = array_unique( (array) apply_filters( 'kses_allowed_protocols', $protocols ) );

Changelog

Version Description
3.0.0 Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/kses_allowed_protocols