src/Composer/Autoload/ClassLoader.php
public function setApcuPrefix($apcuPrefix)
    {
        $this->apcuPrefix = function_exists('apcu_fetch') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) ? $apcuPrefix : null;
    }
public function setApcuPrefix($apcuPrefix)
    {
        $this->apcuPrefix = function_exists('apcu_fetch') && filter_var(ini_get('apc.enabled'), FILTER_VALIDATE_BOOLEAN) ? $apcuPrefix : null;
    }
public function setApcuPrefix ( $ apcuPrefix ) { $ this -> apcuPrefix = function_exists ( 'apcu_fetch' ) && filter_var ( ini_get ( 'apc.enabled' ) , FILTER_VALIDATE_BOOLEAN ) ? $ apcuPrefix : null ; }
APCu prefix to use to cache found/not-found classes, if the extension is enabled.

@param string|null $apcuPrefix
APCu prefix to use to cache found / not - found classes if the extension is enabled .