HashBagOStuff.php

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<?php
class HashBagOStuff extends BagOStuff {
    protected $bag;

    function __construct() {
        $this->bag = array();
    }

    protected function expire( $key ) {
        $et = $this->bag[$key][1];

        if ( ( $et == 0 ) || ( $et > time() ) ) {
            return false;
        }

        $this->delete( $key );

        return true;
    }

    function get( $key, &$casToken = null ) {
        if ( !isset( $this->bag[$key] ) ) {
            return false;
        }

        if ( $this->expire( $key ) ) {
            return false;
        }

        $casToken = serialize( $this->bag[$key][0] );

        return $this->bag[$key][0];
    }

    function set( $key, $value, $exptime = 0 ) {
        $this->bag[$key] = array( $value, $this->convertExpiry( $exptime ) );
        return true;
    }

    function cas( $casToken, $key, $value, $exptime = 0 ) {
        if ( serialize( $this->get( $key ) ) === $casToken ) {
            return $this->set( $key, $value, $exptime );
        }

        return false;
    }

    function delete( $key, $time = 0 ) {
        if ( !isset( $this->bag[$key] ) ) {
            return false;
        }

        unset( $this->bag[$key] );

        return true;
    }
}