helpful_samesite_options
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This filter can be used to extend the options available in the Samesite Option for cookies. Helpful supports the options by default: None, Lax and Strict
The filter expects an array and also returns an array. You can extend the options as follows:
<?php // functions.php
add_filter( 'helpful_samesite_options', function( array $options ) {
$options[] = 'Lax+POST';
return $options;
});