EmptyBagOStuff.php

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<?php
class EmptyBagOStuff extends BagOStuff {
    protected function doGet( $key, $flags = 0 ) {
        return false;
    }
 
    public function add( $key, $value, $exp = 0 ) {
        return true;
    }
 
    public function set( $key, $value, $exp = 0, $flags = 0 ) {
        return true;
    }
 
    public function delete( $key ) {
        return true;
    }
 
    public function merge( $key, callable $callback, $exptime = 0, $attempts = 10, $flags = 0 ) {
        return true; // faster
    }
}