APCUBagOStuff.php

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<?php
class APCUBagOStuff extends BagOStuff {
    const KEY_SUFFIX = ':3';
 
    protected function doGet( $key, $flags = 0, &$casToken = null ) {
        $casToken = null;
 
        $blob = apcu_fetch( $key . self::KEY_SUFFIX );
        $value = $this->unserialize( $blob );
        if ( $value !== false ) {
            $casToken = $blob; // don't bother hashing this
        }
 
        return $value;
    }
 
    public function set( $key, $value, $exptime = 0, $flags = 0 ) {
        apcu_store(
            $key . self::KEY_SUFFIX,
            $this->serialize( $value ),
            $exptime
        );
 
        return true;
    }
 
    public function add( $key, $value, $exptime = 0, $flags = 0 ) {
        return apcu_add(
            $key . self::KEY_SUFFIX,
            $this->serialize( $value ),
            $exptime
        );
    }
 
    public function delete( $key, $flags = 0 ) {
        apcu_delete( $key . self::KEY_SUFFIX );
 
        return true;
    }
 
    public function incr( $key, $value = 1 ) {
        if ( apcu_exists( $key . self::KEY_SUFFIX ) ) {
            return apcu_inc( $key . self::KEY_SUFFIX, $value );
        } else {
            return false;
        }
    }
 
    public function decr( $key, $value = 1 ) {
        if ( apcu_exists( $key . self::KEY_SUFFIX ) ) {
            return apcu_dec( $key . self::KEY_SUFFIX, $value );
        } else {
            return false;
        }
    }
 
    protected function serialize( $value ) {
        return $this->isInteger( $value ) ? (int)$value : serialize( $value );
    }
 
    protected function unserialize( $value ) {
        return $this->isInteger( $value ) ? (int)$value : unserialize( $value );
    }
}