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/** * Callback function for the 'microsub_block' filter. * * @param mixed $ret * @param mixed $channel * @param string $url * @param mixed $user_id * @return mixed The filtered value. */ function my_microsub_block_callback( $ret, $channel, string $url, $user_id ) { // Your code here. return $ret; } add_filter( 'microsub_block', 'my_microsub_block_callback', 10, 4 );
$ret
$channel
string
$url
$user_id
\apply_filters( 'microsub_block', null, $channel, $url, $user_id )
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