Ticket #16642: test-remove-filter.php

<?php

// Just drop this file in your mu-plugins filter and go to the admin dashboard

function some_callback( $value ) {
        return 'filtered';
}
add_filter( 'some_filter', 'some_callback' );

function apply_some_filter() {
        $value = 'raw';
        $value = apply_filters( 'some_filter', $value );

        var_dump( $value );
}
add_action( 'admin_notices', 'apply_some_filter' );

remove_filter( 'some_filter', 'some_callback' );