APCBagOStuff.php

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<?php
class APCBagOStuff extends BagOStuff {

    protected $nativeSerialize;

    const KEY_SUFFIX = ':2';

    public function __construct( array $params = [] ) {
        parent::__construct( $params );

        if ( isset( $params['nativeSerialize'] ) ) {
            $this->nativeSerialize = $params['nativeSerialize'];
        } elseif ( extension_loaded( 'apcu' ) && ini_get( 'apc.serializer' ) === 'default' ) {
            // APCu has a memory corruption bug when the serializer is set to 'default'.
            // See T120267, and upstream bug reports:
            //  - https://github.com/krakjoe/apcu/issues/38
            //  - https://github.com/krakjoe/apcu/issues/35
            //  - https://github.com/krakjoe/apcu/issues/111
            $this->logger->warning(
                'The APCu extension is loaded and the apc.serializer INI setting ' .
                'is set to "default". This can cause memory corruption! ' .
                'You should change apc.serializer to "php" instead. ' .
                'See <https://github.com/krakjoe/apcu/issues/38>.'
            );
            $this->nativeSerialize = false;
        } else {
            $this->nativeSerialize = true;
        }
    }

    protected function doGet( $key, $flags = 0 ) {
        return $this->getUnserialize(
            apc_fetch( $key . self::KEY_SUFFIX )
        );
    }

    protected function getUnserialize( $value ) {
        if ( is_string( $value ) && !$this->nativeSerialize ) {
            $value = $this->isInteger( $value )
                ? intval( $value )
                : unserialize( $value );
        }
        return $value;
    }

    public function set( $key, $value, $exptime = 0, $flags = 0 ) {
        apc_store(
            $key . self::KEY_SUFFIX,
            $this->setSerialize( $value ),
            $exptime
        );

        return true;
    }

    protected function setSerialize( $value ) {
        if ( !$this->nativeSerialize && !$this->isInteger( $value ) ) {
            $value = serialize( $value );
        }
        return $value;
    }

    public function delete( $key ) {
        apc_delete( $key . self::KEY_SUFFIX );

        return true;
    }

    public function incr( $key, $value = 1 ) {
        return apc_inc( $key . self::KEY_SUFFIX, $value );
    }

    public function decr( $key, $value = 1 ) {
        return apc_dec( $key . self::KEY_SUFFIX, $value );
    }
}