use OC_Log instead of error_log

apps/admin_export/settings.php

apps/media/ajax/autoupdate.php

apps/media/lib_ampache.php

apps/media/lib_media.php

apps/media/lib_scanner.php

apps/media/server/xml.server.php

apps/remoteStorage/lib_remoteStorage.php

apps/user_openid/appinfo/app.php

apps/user_openid/phpmyid.php

apps/user_openid/user.php

files/ajax/newfolder.php

index.php

lib/db.php

lib/filestorage/local.php

lib/installer.php

lib/preferences.php