Example of how to add and remove filters (or actions) within a YOURLS plugin class

plugin.php

<?php

/**
 * Example of how to add and remove filters (or actions) within a plugin class
 */

class Add_Remove_Filter {

    function __construct() {
        yourls_add_filter( 'ozh', array( $this, 'do_something' ) );
    }
    
    function check(){
        var_dump( yourls_has_filter( 'ozh' ) );
        var_dump( yourls_has_filter( 'ozh', array( $this, 'do_something' ) ) );
    }
    
    function remove() {
        var_dump( yourls_remove_filter( 'ozh', array( $this, 'do_something' ) ) );
    }

    function do_something( $value ) {
        // do something
    }
}

$ozh = new Add_Remove_Filter;

$ozh->check();
// boolean true
// int 10

$ozh->remove();
// boolean true


$ozh->check();
// boolean false
// boolean false